Searching \ for '[SX] How to get the SX-28 to run on another projec' in subject line. ()
Make payments with PayPal - it's fast, free and secure! Help us get a faster server
FAQ page: www.piclist.com/techref/ubicom/devices.htm?key=sx
Search entire site for: 'How to get the SX-28 to run on another projec'.

Exact match. Not showing close matches.
PICList Thread
'[SX] How to get the SX-28 to run on another projec'
2008\01\15@174558 by eagletalontimn/a

flavicon
face
In SX Microcontrollers, SX/B Compiler and SX-Key Tool, eagletalontim wrote:

I for some reason cannot get the SX-28 to run on a separate project board other than the actual programming board.  it is like the chip gets no power or something.  can someone help me please.

---------- End of Message ----------

You can view the post on-line at:
http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=243374
Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com
The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)

2008\01\15@175512 by JonnyMacn/a

flavicon
face
In SX Microcontrollers, SX/B Compiler and SX-Key Tool, JonnyMac wrote:

You really should have separate resistors for each segment of your 7-segment display.

---------- End of Message ----------

You can view the post on-line at:
http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=243374#m243375
Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com
The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)

2008\01\15@175717 by eagletalontimn/a

flavicon
face
In SX Microcontrollers, SX/B Compiler and SX-Key Tool, eagletalontim wrote:

I am going to add them, but i am limited on how many resistors i have right now.  I am just in the testing stages.  Still cannot figure out why there is no output from the chip when i put it on a normal project board.

---------- End of Message ----------

You can view the post on-line at:
http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=243374#m243376
Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com
The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)

2008\01\15@183344 by JonnyMacn/a

flavicon
face
In SX Microcontrollers, SX/B Compiler and SX-Key Tool, JonnyMac wrote:

You've probably made an error in your connections somewhere....  when in doubt, blame yourself.
---------- End of Message ----------

You can view the post on-line at:
http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=243374#m243387
Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com
The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)

2008\01\15@185006 by eagletalontimn/a

flavicon
face
In SX Microcontrollers, SX/B Compiler and SX-Key Tool, eagletalontim wrote:

ok, i put the chip on my test project board and hooked it up the way it is hooked up on the other project board.  Here is a pic of it.  Still not working :(
---------- End of Message ----------

You can view the post on-line at:
http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=243374#m243389
Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com
The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)

2008\01\15@193219 by JonnyMacn/a

flavicon
face
In SX Microcontrollers, SX/B Compiler and SX-Key Tool, JonnyMac wrote:

Well, it's probably still your fault....  
It looks to me that you're running 12 directly into the chip -- that's way over the specified maximum voltage.  The SX is not like a Stamp module which, in fact, is really a single-board-computer with a regulated power supply.  The SX needs an external regulator and you don't seem to have one in that diagram.

---------- End of Message ----------

You can view the post on-line at:
http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=243374#m243404
Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com
The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)

2008\01\15@193456 by eagletalontimn/a

flavicon
face
In SX Microcontrollers, SX/B Compiler and SX-Key Tool, eagletalontim wrote:

i have a 22k resistor dropping the voltage down to 5 volts.  so i am going to need to buy an external regulator to hook up the chip on another board?  radio shack is my local supply store and i get major discounts since i buy so much from there.  Should i still need a regulator or is there any possible way to power it without the regulator?

---------- End of Message ----------

You can view the post on-line at:
http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=243374#m243405
Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com
The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)

2008\01\15@193607 by beann/a

flavicon
face
In SX Microcontrollers, SX/B Compiler and SX-Key Tool, bean wrote:

You need a 10K resistor from MCLR to Vdd. Otherwise the SX will not run or program.

Bean.

---------- End of Message ----------

You can view the post on-line at:
http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=243374#m243407
Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com
The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)

2008\01\15@193846 by eagletalontimn/a

flavicon
face
In SX Microcontrollers, SX/B Compiler and SX-Key Tool, eagletalontim wrote:

there is a 10K resistor coming from 5v+ going to the MCLR.  then the 5v+ goes to the Vdd.  I have already programmed the chip, but I just need to run it on a stand alone board.

---------- End of Message ----------

You can view the post on-line at:
http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=243374#m243408
Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com
The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)

2008\01\15@194200 by beann/a

flavicon
face
In SX Microcontrollers, SX/B Compiler and SX-Key Tool, bean wrote:

If you have a solid +5V, a bypass cap 0.1uF from Vss to Vdd, and a 10K from Vdd to MCLR then it should run.
I'm not sure what you doing with +12 to 14 through a resistor to Vdd ???

P.S. You might also try adding BOR26 to the device line. This will help if you have a supply that doesn't rise quickly.

Bean.

---------- End of Message ----------

You can view the post on-line at:
http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=243374#m243410
Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com
The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)

2008\01\15@194606 by eagletalontimn/a

flavicon
face
In SX Microcontrollers, SX/B Compiler and SX-Key Tool, eagletalontim wrote:

i need the 12v to power 2 motors but it all has to come from the same power supply.  If I remove the chip from my project board and put it on the programming board, it works perfectly.  I don't see the difference :(
---------- End of Message ----------

You can view the post on-line at:
http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=243374#m243411
Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com
The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)

2008\01\15@200857 by robotworkshopn/a

flavicon
face
In SX Microcontrollers, SX/B Compiler and SX-Key Tool, robotworkshop wrote:

Hello,
From your posts it still isn't quite clear how you are powering the SX28 chip.  It appears that you are trying to use the 22K resistor to drop the 12v down to 5v.  Is that what I am seeing in the picture??  If so I would expect it not to work so it is doing what it should.

You should have a clean 5V supply for the SX28 chip.  That is already present on the programming board for the SX28.  When you put the SX28 on the protoboard can you temporarily take the ground and 5V connections from your programming board and connect those to your breadboard.  If that makes the difference then the power supply is the first problem.  If it works then get at least a 7805 voltage regulator and a couple filtering caps.

If Radio Shack doesn't have those on hand then look for some electronics gadgets headed out to the trash.  You'd be surprised to see just how many will have a 7805 regulator that you can pull out for free.

It's often difficult to get started but once you successfully get through a few projects it does get easier.  There are a lot of people on this forum of all levels of experience and they are very helpful.

Are you going to run everything off of a single battery or is it a 12v wall supply?  Please post how what you are using to power your circuit and what voltages you want it to supply.  Since you mention motors it is also useful to determine the current requirements of those.  If you are powering the motors through a smaller regulator that could cause you problems down the road.

Good luck,
Robert
---------- End of Message ----------

You can view the post on-line at:
http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=243374#m243416
Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com
The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)

2008\01\15@202148 by James Newtonn/a

flavicon
face
In SX Microcontrollers, SX/B Compiler and SX-Key Tool, James Newton wrote:

Dude... The datasheet for the SX28 specifies 5.5 volts MAXIMUM supply voltage. That means you MUST have a regulated power supply.

Also, where is your clock? Did you setup the chip to run on the internal RC oscillator? If so, you do know that runs at something between 3 and 5 KHz, not the standard Mhz right? If you want fast, you must also supply the clock.

Read the datasheet.

---------- End of Message ----------

You can view the post on-line at:
http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=243374#m243420
Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com
The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)

2008\01\15@202259 by eagletalontimn/a

flavicon
face
In SX Microcontrollers, SX/B Compiler and SX-Key Tool, eagletalontim wrote:

The circuit will be mounted inside a car running from a 12 to 14v 10 amp supply so I can only run off of 1 power source.   i just tried what you said by taking the chip out of the programming board and putting it in my stand alone project board then running the wires from the programming board to power the chip.  It did not work :(  I tried the 10k resistor to the MCLR, tried putting another cap between Vdd and Vss, I even took the same resistor and LED off the programming board and put it on the project board.  nothing worked :(  I got my ohm meter and checked to ensure all 28 pins were getting a good connection and they were.  I am stumped and I really want to get this project done before friday.

---------- End of Message ----------

You can view the post on-line at:
http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=243374#m243421
Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com
The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)

2008\01\15@204922 by JonnyMacn/a

flavicon
face
In SX Microcontrollers, SX/B Compiler and SX-Key Tool, JonnyMac wrote:

Running it in a car (NOISY power) means you should _definitely_ use a regulator and filter circuit; maybe even an LC circuit upstream of the power supply to cut down on the noise.  It is not the SX's fault here; you've stated that it works in one place but not another -- the only thing that changed are your connections.  You really should get a regulator and consider reviewing and reconnecting everything else.  One of my friends was having trouble today until he pulled his circuit apart and reconnected -- it started working.

---------- End of Message ----------

You can view the post on-line at:
http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=243374#m243430
Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com
The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)

2008\01\15@212436 by eagletalontimn/a

flavicon
face
In SX Microcontrollers, SX/B Compiler and SX-Key Tool, eagletalontim wrote:

ok, i will get one tomorrow from radioshack.  If possible, could someone post a schematic on how to power up the SX without the programming board like what i need.  I am not the best at figuring out things before i burn them up :p  I would greatly appreciate it!

---------- End of Message ----------

You can view the post on-line at:
http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=243374#m243434
Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com
The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)

2008\01\15@230806 by eagletalontimn/a

flavicon
face
In SX Microcontrollers, SX/B Compiler and SX-Key Tool, eagletalontim wrote:

If there are any documents about the SX that have schematics, I would love to see how to power and work this chip apart from having to keep it in the programming board.

With the regulator, can I use it to drop the power down from 12 - 14v to 5v, then control the output to be 12 - 14v to the motor using transistors without causing problems with the regulator?  I have never used a regulator before and am still learning as much as I can.

---------- End of Message ----------

You can view the post on-line at:
http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=243374#m243443
Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com
The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)

2008\01\15@231350 by JonnyMacn/a

flavicon
face
In SX Microcontrollers, SX/B Compiler and SX-Key Tool, JonnyMac wrote:

Have a look at the schematic that's attached; the power supply is very generic and you can use the 7805 where I have the LF50 (an LDO regulator) as long as your input is greater than 7 volts.

---------- End of Message ----------

You can view the post on-line at:
http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=243374#m243444
Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com
The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)

2008\01\16@065244 by robotworkshopn/a

flavicon
face
In SX Microcontrollers, SX/B Compiler and SX-Key Tool, robotworkshop wrote:

[Quoting: "eagletalontim"]There is no timing in the programming.  just if's then's and else's and a few goto's.  The chip is getting 5v DC!!!!  It is NOT getting 12v.  The 12 volts is cut down by the 22k resistor dropping it to 5v.  I don't even think there is a pause statement in there now.

Ok, can you explain to me exactly how you are getting 5V to the SX28 chip through a 22K ohm resistor??  I just don't see how that is possible.  Please post a schematic.  Even if you measured 5V at some point if you are relying on a resistor to bring down the power to 5V it would be completely unstable and jump all over the place.  From everything i've read so far this is the most likely thing that is causing the problem.

Can you at least try to use to 5V from your programming board as a test to confirm or deny that the power is or is not the problem??  Until you do that all the other troubleshooting will be a waste of time.  Stable power to the chip is one of the basics.
Running everything off a single 12v source (or battery) is not a problem at all.  For any other voltages you just derive them from the 12v source.  Some of the options you can use (There are others):

- Small DC/DC convertor
- Voltage regulator (780x series are very common)
- Several large rectifier diodes in series (I would not recommend this for your application)
- A couple low ohm (hi wattage) resistors setup as a votlage divider with a Zener diode as a reference.  (I would not go this route either)
In any of the cases above you'll want to add some filtering caps on both the input and output of the circuit to generate your 5V.  Caps are cheap and you will need them if you are going to put them in your car.

I think your best bet is to just use a 5v regulator with some caps to power the SX processor.

Good luck,
Robert
---------- End of Message ----------

You can view the post on-line at:
http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=243374#m243491
Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com
The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)

2008\01\16@072946 by robotworkshopn/a

flavicon
face
In SX Microcontrollers, SX/B Compiler and SX-Key Tool, robotworkshop wrote:

[Quoting: "eagletalontim"]With the regulator, can I use it to drop the power down from 12 - 14v to 5v, then control the output to be 12 - 14v to the motor using transistors without causing problems with the regulator?  I have never used a regulator before and am still learning as much as I can.

The answer to your question above is yes!  It is one of the most common ways to handle this.

To control your motor there is a variety of options.  First, how do you need to control your motor??  Do you need just a simple on/off control?  Do you need to be able to vary the speed?  Also, do you need to control the direction?

If you just need simple on/off control then you might just want to use a relay.  There are quite a few examples of this for use with the BASIC Stamp.  You would control them with the SX chip the same way.  An example can be found at:

http://www.parallax.com/dl/docs/cols/nv/vol1/col/nv6.pdf
Also, be sure to read through the old Nuts&Volts articles on the Stamps and SX.  They are very helpful.  You can get them at:

http://www.parallax.com/Resources/NutsVoltsColumns/tabid/272/Default.aspx
For variable speed control in one direction you can consider MOSFET's.  If you need variable control in both directions then start looking at H-Bridge circuits.

Hope these help,
Robert
---------- End of Message ----------

You can view the post on-line at:
http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=243374#m243495
Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com
The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)

2008\01\16@123435 by eagletalontimn/a

flavicon
face
In SX Microcontrollers, SX/B Compiler and SX-Key Tool, eagletalontim wrote:

I finally got the chip to boot up with the regulator.  i wound up having to put a 1k resistor from the 12v source to the input of the regulator or it would burn it up.  found that out the hard way :(  
Yes, I just need to turn the motors on/off  I think i figured out that circuit using an NPN and a PNP.  The PNP is rated at 15A so i should not have any problems with it i hope :p
---------- End of Message ----------

You can view the post on-line at:
http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=243374#m243568
Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com
The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)

2008\01\16@124557 by robotworkshopn/a

flavicon
face
In SX Microcontrollers, SX/B Compiler and SX-Key Tool, robotworkshop wrote:

Hello,
Glad to hear that you've been able to get your project going.  Instead of using a 1K resistor to feed the voltage regulator you might want to use a few 1N5401 diodes in series to bring the voltage down a bit before going into the regulator.  Each one of those diodes will give about a .7V drop.  Four of those diodes in series will drop the 12v to something closer to 9V which is just fine for most 5V regulators.  Make sure to add some sort of filtering on the power lines too.

Good luck,
Robert
---------- End of Message ----------

You can view the post on-line at:
http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=243374#m243571
Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com
The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)

2008\01\16@124732 by eagletalontimn/a

flavicon
face
In SX Microcontrollers, SX/B Compiler and SX-Key Tool, eagletalontim wrote:

what do you mean by filtering?  What would i use for that?

---------- End of Message ----------

You can view the post on-line at:
http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=243374#m243572
Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com
The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)

2008\01\16@125637 by robotworkshopn/a

flavicon
face
In SX Microcontrollers, SX/B Compiler and SX-Key Tool, robotworkshop wrote:

At the very least you would want to add something like a 10uf electrolytic cap across the output of the 7805 voltage regulator.  Note that some caps are polarized and can't be connected backwards.  The electrolytic is polarized so make sure the 1 gotes to ground and the other side goes to +5v.  You should also add a .1uf or .01uf cap directly across the power leads on the SX28 processor.  As a general rule I always put a .1uf or .01uf cap at every IC right at it's supply pins.  In simple terms the capacitors will help smooth out any spikes that can and will occur on the power lines.  For reliable operation it is just good practice to add them from the start.  Without them you can get random glitches in the system that are hard to troubleshoot.

The LC filtering that JonnyMac mentioned is another step above this.  It would entail adding an inductor in series with one of the power input lines and then a cap across the power going into the voltage regulator.  You may or may not need to go this route.

Some searches on Google on power filtering, LC circuits, etc should turn up more detailed info about this.

Robert
---------- End of Message ----------

You can view the post on-line at:
http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=243374#m243574
Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com
The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)

2008\01\16@164132 by eagletalontimn/a

flavicon
face
In SX Microcontrollers, SX/B Compiler and SX-Key Tool, eagletalontim wrote:

ok, i added an electrolytic cap to the Vdd and the ground and it works good :)  one problem i have now is that the output of the transistors is not enough to run the motors :(  I need help figuring this one out.  I have the output of the chip going to a 100k resistor that goes to the base of a switching NPN.  The collector is connected to a 10K resistor then to ground.  The emitter of the NPN is going to the ground of the PNP transistor.  The collector of the PNP is going to the motor and the emitter is going straight to the voltage in without restrictions.   I wish I could draw up a schematic, but i have not found a program to help me do that.   What am i doing wrong to not be able to power the motors?

---------- End of Message ----------

You can view the post on-line at:
http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=243374#m243617
Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com
The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)

2008\01\16@185827 by robotworkshopn/a

flavicon
face
In SX Microcontrollers, SX/B Compiler and SX-Key Tool, robotworkshop wrote:

It sounds like the resistors are way too high and it's hard to picture exactly how you've got this connected.  If you need a simple schematic drawing package there is an excellent one you can download for free from:

http://www.expresspcb.com/
A schematic will help illustrate just how you have things connected and make it easier for others to comment and help.

Some other links that may help are:

http://www.windmeadow.com/node/4 http://hades.mech.northwestern.edu/wiki/index.php/Driving_using_a_single_MOSFET
---------- End of Message ----------

You can view the post on-line at:
http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=243374#m243634
Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com
The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)

2008\01\16@190024 by DigitalDjn/a

flavicon
face
In SX Microcontrollers, SX/B Compiler and SX-Key Tool, DigitalDj wrote:

One thing I have found and try to stay away from is running anymore voltage to the 5volt regulator than needed. Running 12volts into the 5 volt regulator creates alot of heat.

As far as your transistor setup your base resistors are way to high and should be based on the transistor specs. If you had a schematic so we could see what you are trying to do and would help. NPN transistors are for current sink(switching ground) and PNP transistors for switching positive voltages. The one thing you have to watch with a PNP transistor is the fact that there will be a postive voltage on the base and if you are running 12volts through the transistor you will end up with that voltage back at the SX this is a bad situation. It is always best to have positive trigger out of the SX to a NPN then to a PNP or just NPN only for current sink to the motor.

Kevin
---------- End of Message ----------

You can view the post on-line at:
http://forums.parallax.com/forums/default.aspx?f=7&p=2&m=243374#m243635
Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com
The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)

2008\01\17@001250 by eagletalontimn/a

flavicon
face
In SX Microcontrollers, SX/B Compiler and SX-Key Tool, eagletalontim wrote:

I attached a schematic with designed with the program above on how i have the chip hooked up.  It may not be exact for the power up of the chip, but the output is exact on pin RB0.   I need to keep it a positive output because the motors are already grounded to the body of the car.  This is the last bug i have to work out before i can test it full scale :)  Hopefully you can help me!

---------- End of Message ----------

You can view the post on-line at:
http://forums.parallax.com/forums/default.aspx?f=7&p=2&m=243374#m243679
Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com
The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)

2008\01\17@051851 by Shawn Lowen/a

flavicon
face
In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Shawn Lowe wrote:

You have -12V in your car system?

---------- End of Message ----------

You can view the post on-line at:
http://forums.parallax.com/forums/default.aspx?f=7&p=2&m=243374#m243696
Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com
The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)

2008\01\17@060229 by beann/a

flavicon
face
In SX Microcontrollers, SX/B Compiler and SX-Key Tool, bean wrote:

R1 is going to limit the current you can use to about 12mA.

No 10K on the MCLR pin.

The PNP transistor has the emitter and base connected together ???

I would look at using a FET or relay for motor control. The TIP42 has pretty low gain.

Bean.

---------- End of Message ----------

You can view the post on-line at:
http://forums.parallax.com/forums/default.aspx?f=7&p=2&m=243374#m243702
Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com
The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)

2008\01\17@072244 by eagletalontimn/a

flavicon
face
In SX Microcontrollers, SX/B Compiler and SX-Key Tool, eagletalontim wrote:

Sorry.  i just downloaded that program and put that schematic together all within 15 minutes.  never used it before.  No, there is no -12 in my car :P
R1 is limiting the current to the chip.  The collector of the PNP is connected before the 1k so that there is no resistance except for the resistance of the PNP transistor.

There is a 10k going to the MCLR, i just forgot to put that in the schematic.

I am trying to build this circuit to not have moving parts and want to keep it as small as possible so I don't want to use relays.   Would radioshack have an FET that can handle 10A?  I am still learning about more about transistors so I have limited knowledge on what to use.  I was under the impression that transistors were kind of like switches with no moving parts.

---------- End of Message ----------

You can view the post on-line at:
http://forums.parallax.com/forums/default.aspx?f=7&p=2&m=243374#m243718
Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com
The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)

2008\01\17@073029 by JonnyMacn/a

flavicon
face
In SX Microcontrollers, SX/B Compiler and SX-Key Tool, JonnyMac wrote:

You don't need a current limiter to the SX; it will consume what it does, and your job is to make sure that the outputs aren't over-driven (I use them at 12- and 24-volts [with proper regulation] every day).  And as Terry pointed out there are elements missing from your schematic that you will find on the [working] project I posted earlier.  This thread really isn't about the SX anymore, it's about basic circuit design.

---------- End of Message ----------

You can view the post on-line at:
http://forums.parallax.com/forums/default.aspx?f=7&p=2&m=243374#m243723
Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com
The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)

2008\01\17@073935 by eagletalontimn/a

flavicon
face
In SX Microcontrollers, SX/B Compiler and SX-Key Tool, eagletalontim wrote:

I had to put the 1K resistor before the regulator because if I did not, it would get hot and pop the regulator, then send too much to the chip and burn it up.  Found that out first hand. :(
If i hook the meter up to the output of the PNP with no load, it is coming out like it should at 12V, but when I hook up the motor to it, it does not turn the motor at all.  it is like there is not enough power to run it.  Do i have missing components or can I eliminate part of what I have and get it to work right?  I use radioshack because it is 5 miles down the road and i can pick up the parts that same day to test them to see if it works.  most companies will screw you on shipping so it is a little better for me to at least test it with radioshack parts first.

---------- End of Message ----------

You can view the post on-line at:
http://forums.parallax.com/forums/default.aspx?f=7&p=2&m=243374#m243725
Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com
The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)

2008\01\17@074443 by beann/a

flavicon
face
In SX Microcontrollers, SX/B Compiler and SX-Key Tool, bean wrote:

If the regulator and/or SX was getting hot without the 1K resistor, then something is not connected right.

The regulator cannot "force feed" current into the SX. If the output is 5 volts, then the SX consume whatever current it needs.

How much current does your motor need ? How much current is the SX using ?

Bean.

---------- End of Message ----------

You can view the post on-line at:
http://forums.parallax.com/forums/default.aspx?f=7&p=2&m=243374#m243729
Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com
The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)

2008\01\17@074611 by Shawn Lowen/a

flavicon
face
In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Shawn Lowe wrote:

eagletalontim-
I hear you about the shiping. I wish I had an electronics distributor closer to where I live (the closest is 30 miles away in Salt lake city, not exactly convienient). Unfortunately, radio shacks selection leaves something to be desired
---------- End of Message ----------

You can view the post on-line at:
http://forums.parallax.com/forums/default.aspx?f=7&p=2&m=243374#m243733
Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com
The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)

2008\01\17@074936 by eagletalontimn/a

flavicon
face
In SX Microcontrollers, SX/B Compiler and SX-Key Tool, eagletalontim wrote:

the motor needs as much possible current as it can get.   The schematic shown in one of my last posts is how it was hooked up.  The 10K was connected to the MCLR, but i forgot it in the schematic.  When i removed the 1K, the regulator would instantly start getting hot and i had to disconnect it.  I have no idea how to read the current that the chip is using.

---------- End of Message ----------

You can view the post on-line at:
http://forums.parallax.com/forums/default.aspx?f=7&p=2&m=243374#m243734
Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com
The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)

2008\01\17@075850 by robotworkshopn/a

flavicon
face
In SX Microcontrollers, SX/B Compiler and SX-Key Tool, robotworkshop wrote:

One of the first things you'll want to do is measure how much current the motor actually uses when it is connected directly to a 12v battery.  Find out what the no load current is, loaded current, and you should probably figure out what the stall current is as well.

If you just want to control a motor (on/off) then your best bet is just to have the SX processor control a relay.  You can get automotive relays everywhere, many are not too expensive, and are made for switching loads like this.  Schematics have already been provided in one of the links i've posted on this thread on how to connect the SX so it can control a relay.

I wouldn't try controlling any sort of motor with the method your using (unless it was a .50 hobby motor) since motors can be messy.  The make all kinds of electrical noise and it's best to isolate them from your processor circuit.  Using a relay will accomplish this.  From all the details you've posted I feel this is probably the best option for your circuit.

---------- End of Message ----------

You can view the post on-line at:
http://forums.parallax.com/forums/default.aspx?f=7&p=2&m=243374#m243737
Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com
The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)

2008\01\17@081017 by eagletalontimn/a

flavicon
face
In SX Microcontrollers, SX/B Compiler and SX-Key Tool, eagletalontim wrote:

with the board that I am using, i am extremely limited on space.  What i am controlling on the car are solenoids.  I have not been able to get the patent since i do not have a full scale working design so I don't want to give out too much info to the public.  I have been working on this way too long to have someone else yank it from me.  I just need help getting things sorted out.

I use DC motors as my testing to see if it will work when hooked up to my car.  The solenoids are already controlled by a computer in the car and it does not use relays so it has to be able to be done without relays.  I want to be able to bypass those and control them when I want.

---------- End of Message ----------

You can view the post on-line at:
http://forums.parallax.com/forums/default.aspx?f=7&p=2&m=243374#m243743
Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com
The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)

2008\01\17@102233 by JonnyMacn/a

flavicon
face
In SX Microcontrollers, SX/B Compiler and SX-Key Tool, JonnyMac wrote:

Have a look at the schematic I've attached -- I think it meets the circuitry requirements for your project -- though you'll have to speck in the transistors based on solenoid loads, and you may need more filtering due to a car's typically-noisy electrical system.  The connections are based on two threads you've started that seem to be related, and use only the RA and RB ports of the SX which means your final design could run on the SX20SS.
If it works, send me a check -- consultants have to eat, too!  :tongue:

---------- End of Message ----------

You can view the post on-line at:
http://forums.parallax.com/forums/default.aspx?f=7&p=2&m=243374#m243791
Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com
The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)

2008\01\17@124522 by eagletalontimn/a

flavicon
face
In SX Microcontrollers, SX/B Compiler and SX-Key Tool, eagletalontim wrote:

well, the motors come on, but they stay on the entire cycle.  should i change the resistor coming from the chip to the NPN to something larger?  The NPN is sensitive to touch and can be at full power with just the touch of your finger.

---------- End of Message ----------

You can view the post on-line at:
http://forums.parallax.com/forums/default.aspx?f=7&p=2&m=243374#m243823
Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com
The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)

2008\01\17@154710 by eagletalontimn/a

flavicon
face
In SX Microcontrollers, SX/B Compiler and SX-Key Tool, eagletalontim wrote:

ok, i followed your schematic for the regulator just to see if maybe that was part of my problem.  The image attached is how I have it hooked up. I am not getting 5v out of the output side of the regulator.  I am getting more like 15v that if straight run to the motors, they run perfect.  Should I not be getting 5v out instead of 15v?   The more i test things on here, the farther away from accomplishing this project :(  I really need to know why i cannot simply control the positive connection for the motor without using a relay.

---------- End of Message ----------

You can view the post on-line at:
http://forums.parallax.com/forums/default.aspx?f=7&p=2&m=243374#m243869
Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com
The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)

2008\01\17@170120 by PJ Allenn/a

flavicon
face
In SX Microcontrollers, SX/B Compiler and SX-Key Tool, PJ Allen wrote:

I've used a resistor on the input of a linear regulator, as you're suggesting, I guess, to drop the voltage at the input.  But it has to be a fairly low value and a power resistor at that (it'll take the heat that you're sparing the regulator.)
pic attached
---------- End of Message ----------

You can view the post on-line at:
http://forums.parallax.com/forums/default.aspx?f=7&p=2&m=243374#m243888
Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com
The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)

2008\01\17@190848 by DigitalDjn/a

flavicon
face
In SX Microcontrollers, SX/B Compiler and SX-Key Tool, DigitalDj wrote:

Seems like your in a very big hurry my friend! Be patient and problems will get worked out! It is a very good idea to purchase a multimeter for doing your current checks.

I take it no one else has had heat problems with putting 12 volts into a 5volt regulator? Typical voltage on a LM7805 is 7.5volts and max 10volts.

Kevin
---------- End of Message ----------

You can view the post on-line at:
http://forums.parallax.com/forums/default.aspx?f=7&p=2&m=243374#m243916
Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com
The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)

2008\01\17@195132 by datacpsn/a

flavicon
face
In SX Microcontrollers, SX/B Compiler and SX-Key Tool, datacps wrote:

You can use a logic drive MOSFET to control your motor right from the CHIP like this.

I made a quick schematic of a motor control for you. I did not put the 10K to MCLR just the Programing header, the power supply and output control and  you should look at the SX 28 Specs PDF on this site so you don't burn up your chip... I hope this helps you. Sounds like you are starting to have fun with the SX Chip.. Good luck..

THE IRL510 is rated upto 100v. They make other values . I don't know what exactly you need but if you are just turning on a motor with no real control then maybe a TIP or transistor will do.. You have 2 roads you can go with out giving your circuit away.

---------- End of Message ----------

You can view the post on-line at:
http://forums.parallax.com/forums/default.aspx?f=7&p=2&m=243374#m243922
Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com
The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)

2008\01\17@233239 by eagletalontimn/a

flavicon
face
In SX Microcontrollers, SX/B Compiler and SX-Key Tool, eagletalontim wrote:

i was unable to open the attachment datacps :(  not sure if it is my version of the SX-Key, but it showed up as Ascii.  I thought Mosfets were static sensitive.  Would that not cause problems?  If not, what would be the best one to use?

---------- End of Message ----------

You can view the post on-line at:
http://forums.parallax.com/forums/default.aspx?f=7&p=2&m=243374#m243949
Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com
The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)

2008\01\18@114744 by PJMontyn/a

flavicon
face
In SX Microcontrollers, SX/B Compiler and SX-Key Tool, PJMonty wrote:

eagletalontim,
If all you want to do is get a patent, you don't need a working prototype.  The patent office doesn't come by to see the device in action.  You're patenting the idea of a device.  If you want to patent "Waffles with Wings", you don't need either waffles or wings - you need a patent attorney and some money.  After that, some patent office person will review it and likely rubber stamp it.  Bingo!  You now have the patent for "Waffles with Wings!"  
Want an example?  How about an antigravity device?  Check out this article:

http://news.nationalgeographic.com/news/2005/11/1111_051111_junk_patent.html
This one one the same sbject gives a good breakdown of the patented device:

http://ipbiz.blogspot.com/2005/11/uspto-issues-anti-gravity-patent.html
Do you really think the patent holder actually built a device that is contained within a hollow superconductive shield?  I doubt it.

Of course, you do know that a patent requires full and public disclosure of exactly how your device is supposed to work, right?  Once that happens, anyone who wants to copy your device can do so by simply looking up the patent.  At  that point, your only recourse is to sue them.  Unless you sell this device to a big manufacturer with deep pockets, you're on the hook for defending your patent.  
BTW, the Chinese are real big on making copies of pretty much everything these days, so I hope you or your lawyer speak Mandarin.

Thanks,
PeterM
---------- End of Message ----------

You can view the post on-line at:
http://forums.parallax.com/forums/default.aspx?f=7&p=2&m=243374#m244041
Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com
The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)

2008\01\18@121456 by eagletalontimn/a

flavicon
face
In SX Microcontrollers, SX/B Compiler and SX-Key Tool, eagletalontim wrote:

you do have a good point :)  Any suggestions on what I should do to help keep people from stealing my design?

Also.  what MOSFET should i use?  N-channel or P-Channel?  If someone could read the Motor Control schematic posted above, can you convert it to an image so I can read it please :)
---------- End of Message ----------

You can view the post on-line at:
http://forums.parallax.com/forums/default.aspx?f=7&p=2&m=243374#m244046
Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com
The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)

2008\01\18@123617 by robotworkshopn/a

flavicon
face
In SX Microcontrollers, SX/B Compiler and SX-Key Tool, robotworkshop wrote:

It is very common to connect one lead your motor or solenoid to your positive voltage source (in your case +12v) and then use a MOSFET, Transistor, relay, etc as an electronic switch to connect the other lead to ground when you want to turn it on.

Have you visited the other links that I posted in the message about the schematic layout tool in a previous post??  The last link shows an example of how a MOSFET can be used to control a device.  It specifically mentions Coil or Motor.  A coil can be the coil of a relay or solenoid.

There are a lot of ways to control a solenoid and motor that you can choose from.

We can't really recommend any specific parts since we don't know what the current requirements are for the item you want to control.  Take some current readings to try and find out what the current draw is for the parts you are using.  Factor in a safety margin and experiment a bit.

The reason you can't open the schematic above is that there are spaces in the filename and there is an issue with the forum itself in the way it handles attachments with spaces.  Just save it to your local drive, change the extension to .sch and then open it with that free schematic program you are already using.

Robert
---------- End of Message ----------

You can view the post on-line at:
http://forums.parallax.com/forums/default.aspx?f=7&p=2&m=243374#m244049
Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com
The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)

2008\01\18@132833 by eagletalontimn/a

flavicon
face
In SX Microcontrollers, SX/B Compiler and SX-Key Tool, eagletalontim wrote:

well, in my case, it is impossible to control the ground of the solenoids.  they are already mounted to the car and have to have a positive input of 12 - 14v 10A.   I do not want to use relays since they have moving parts and take up too much room for the amperage that i need to control.  The solenoids are already controlled by a computer, but i want to bypass it and use my design.  The computer does no have relays in it so it has to be possible to send out a positive 12 to 14v 10A signal using the SX28 and transistors.  I just can't figure out how to control that much without burning up the chip.  Already burned up 2 of them :(
---------- End of Message ----------

You can view the post on-line at:
http://forums.parallax.com/forums/default.aspx?f=7&p=2&m=243374#m244060
Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com
The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)

2008\01\18@135112 by black68cougarn/a

flavicon
face
In SX Microcontrollers, SX/B Compiler and SX-Key Tool, black68cougar wrote:

There are devices called "high-side switches". They are placed between the 12V supply and the load. Many are designed for the automotive market.

Just Google "high side switch"

Doug
---------- End of Message ----------

You can view the post on-line at:
http://forums.parallax.com/forums/default.aspx?f=7&p=2&m=243374#m244069
Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com
The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)

2008\01\18@141821 by eagletalontimn/a

flavicon
face
In SX Microcontrollers, SX/B Compiler and SX-Key Tool, eagletalontim wrote:

thanks!  i will be looking for one of these to order that will fit my specs.

---------- End of Message ----------

You can view the post on-line at:
http://forums.parallax.com/forums/default.aspx?f=7&p=2&m=243374#m244075
Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com
The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)

2008\01\18@184830 by datacpsn/a
flavicon
face
In SX Microcontrollers, SX/B Compiler and SX-Key Tool, datacps wrote:

eagle they make PNP devices that can turn on the Positive side of the circuit. All you would have to do is send a low signal. I changed the schematic to show how it is connected..

---------- End of Message ----------

You can view the post on-line at:
http://forums.parallax.com/forums/default.aspx?f=7&p=3&m=243374#m244115
Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com
The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)

2008\01\18@185540 by datacpsn/a

flavicon
face
In SX Microcontrollers, SX/B Compiler and SX-Key Tool, datacps wrote:

this is a link where you can find several PNP devices for your application..
http://www.mouser.com/Search/Refine.aspx?Ntt=*pnp*&N=1323038&Ntx=mode%2bmatchall&Ns=P_SField&OriginalKeyword=pnp&Ntk=Mouser_Wildcards
---------- End of Message ----------

You can view the post on-line at:
http://forums.parallax.com/forums/default.aspx?f=7&p=3&m=243374#m244116
Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com
The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)

2008\01\18@185738 by eagletalontimn/a

flavicon
face
In SX Microcontrollers, SX/B Compiler and SX-Key Tool, eagletalontim wrote:

I got it sort of working.  i am drawing a schematic of what i got and need to see what is wrong with it.  will be posted in a few min
---------- End of Message ----------

You can view the post on-line at:
http://forums.parallax.com/forums/default.aspx?f=7&p=3&m=243374#m244117
Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com
The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)

2008\01\18@190649 by eagletalontimn/a

flavicon
face
In SX Microcontrollers, SX/B Compiler and SX-Key Tool, eagletalontim wrote:

Ok, i attached the schematic on how I have it hooked up on the board, but for some reason both motors come on at the same time when they are supposed to come on at different times.  if the setting is both off, then they both turn off like they should.  The Switching NPN transistors seem to be the problem, but they do work properly if run one at a time on the test board.  If i hook up both of them, it acts weird.  I think it may have something to do with static or something to that effect.  Can a put a resistor on it going to ground to eliminate that problem.  If so, what size?  If not, what should I do.  I am soooo close to getting it finished!  next project is a robot of some sort.  got 5 or more sx chips to play with now :D
---------- End of Message ----------

You can view the post on-line at:
http://forums.parallax.com/forums/default.aspx?f=7&p=3&m=243374#m244118
Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com
The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)

2008\01\18@191426 by PJ Allenn/a

flavicon
face
In SX Microcontrollers, SX/B Compiler and SX-Key Tool, PJ Allen wrote:

Do you have your 5V situation right-wised then?

---------- End of Message ----------

You can view the post on-line at:
http://forums.parallax.com/forums/default.aspx?f=7&p=3&m=243374#m244119
Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com
The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)

2008\01\18@191613 by eagletalontimn/a

flavicon
face
In SX Microcontrollers, SX/B Compiler and SX-Key Tool, eagletalontim wrote:

yep yep.  got that working last night and it is all working the way it should except the output control from the chip.

---------- End of Message ----------

You can view the post on-line at:
http://forums.parallax.com/forums/default.aspx?f=7&p=3&m=243374#m244120
Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com
The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)

2008\01\18@225535 by eagletalontimn/a

flavicon
face
In SX Microcontrollers, SX/B Compiler and SX-Key Tool, eagletalontim wrote:

yes, anyone have any idea what may be wrong with the schematic posted above?

---------- End of Message ----------

You can view the post on-line at:
http://forums.parallax.com/forums/default.aspx?f=7&p=3&m=243374#m244144
Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com
The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)

2008\01\19@010024 by g_daubachn/a

flavicon
face
In SX Microcontrollers, SX/B Compiler and SX-Key Tool, g_daubach wrote:

I would attach 10 kOhm resistors between the bases and +12V on both TIP42 transistors to make sure that they turn completely off when the inputs are low.

Next, I would remove the SX, and then apply +5V to one of the inputs to verify that the motors turn on separately. If this is the case, something must be wrong either with the controller software, or with the controller's 5V supply or ground connection.

---------- End of Message ----------

You can view the post on-line at:
http://forums.parallax.com/forums/default.aspx?f=7&p=3&m=243374#m244158
Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com
The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)

2008\01\19@155513 by eagletalontimn/a

flavicon
face
In SX Microcontrollers, SX/B Compiler and SX-Key Tool, eagletalontim wrote:

thanks :)  that worked perfectly :D
---------- End of Message ----------

You can view the post on-line at:
http://forums.parallax.com/forums/default.aspx?f=7&p=3&m=243374#m244319
Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com
The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)

More... (looser matching)
- Last day of these posts
- In 2008 , 2009 only
- Today
- New search...