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'[SX] Mill Speedo Tach'
2007\08\06@041718 by Professorwizn/a

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Professorwiz wrote:

I was looking at the Basic Stamp project, Mill_Speedo that uses the Melexis 90217 crank sensor.  Has anyone converted this for use with the SX chip?

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2007\08\06@041804 by Professorwizn/a

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Professorwiz wrote:

Opps forgot to add, the original posting / data is here
http://www.parallax.com/html_pages/robotics/machining/RPM_display.asp
Thanks,
Russ
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2007\08\06@145645 by Capt. Quirkn/a

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Capt. Quirk wrote:

Yes I have, but it has been modified to fit  my needs. The biggest problem was the SubRoutine LCD_Put_RJ_Value, Bean & JonnyMac both provided code for it and you can find there examples in the SX thread index.

What are you planning on doing and with what type of lcd?

Also, the hall sensor works great, no problem with the SX.

Bill
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2007\08\06@160445 by Professorwizn/a

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Professorwiz wrote:

Well actually I wanted to use some really cool 4" tall 7 segment displays, that have 4 segments connected to them.  I have 2 projects in mind, one is I have a largesh (for Hobbiest) cnc machine I'd like to put a spindle speed display on, and another is I have a .90 nitro motor that was converted to spark ignition with electronic timing.  I was wanting to just make an RPM display for that while bench running it in, or perhaps a temp / rpm display that would switch between the 2.  Lots of idea's but not enough smarts yet.  

Russ
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2007\08\06@173551 by beann/a

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

Russ,
 Are these the displays you purchased from me ?
 Did you get a circuit to drive them ? I couldn't find the one I had used, but I could pencil and scan a schematic if you need it.

Bean.

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2007\08\06@180657 by Professorwizn/a

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Professorwiz wrote:

Bean,
Yes these are the ones I got from you! Thanks they look great, these should be really cool.  I would very much appriciate any kind of pencil schematic from you!  They should be very neat on both projects.

Russ
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2007\08\06@183026 by Capt. Quirkn/a

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Capt. Quirk wrote:

I have code for a Parallel LCD that displays RPM's and Head or Exhaust temp (or both) for a type K thermocouple and MAX 6675 CJC IC's. You can have any part of it or all of it, if you want it.

Bill
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2007\08\07@020351 by Professorwizn/a

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Professorwiz wrote:

Bill,
That is very generous of you, yes I would love to get your code from you.  

Russ
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2007\08\07@050647 by beann/a

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

Russ,
 Here is the drive circuit I used for the 4" LED displays.

Bean.

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2007\08\07@052754 by Professorwizn/a

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Professorwiz wrote:

Bean,
I have a question on your schematic.  for R3 it shows a 4K7, I'm unfamiliar with that nomenclature.  Could you explane what that means.  Sorry to have to ask you something I'm sure is simple.

Russ
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2007\08\07@055617 by RDL2004n/a

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, RDL2004 wrote:

Professor,
The letter K indicates where the decimal point is. I think this method of comes from parts that aren't marked with numbers instead of color stripes - it's harder to rub the whole letter off to where it becomes illegible vs. a single dot.

The letter used gives the multiplier, R is used as zero, K is x1000, M is x1meg.

So 4k7 is 4700 ohms. 100R would be 100 ohms. 3M3 would be 3.3 megohms.

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2007\08\07@060017 by Professorwizn/a

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Professorwiz wrote:

Rick,
Thanks, I knew it had to be something simple.  I appriciate you taking the time to inform me.

Russ
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2007\08\07@062459 by beann/a

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

Russ,
 Rick is correct. The "K" takes the place of the decimal point. When schematics get faxed or copied it is very easy for the dot to go missing. So a 4.7K resistor looks like a 47K resistor. Using the "K" for the "." Makes it less likely to get screwed up.

 I have to thank our friends in the UK for this idea.

Bean.

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2007\08\07@210807 by Capt. Quirkn/a

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Capt. Quirk wrote:

Here is the code I was talking about. Youn will have to convert some of it for use with LED's, but it's a start.

I would recomend placing the thermocouple as close to the spark plug seat as possible. A reading from under the spark plug of 300 degrees is optimal. You may be able to find a ready made TC to fit under your spark plug (even if it's a 1/4-32) from EGT
Buy the smallest neodymium magnets you can, it will still be more than enough for the Melexis Hall Sensor
Good Luck
Bill
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2007\08\08@034401 by Professorwizn/a

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Professorwiz wrote:

Bill,

Thanks for very much for posting your code.  I appriciate your time and effort.  
The magnet I'm going to use is the one Parallax sells #605-00006.  I'm going to try to use the existing magnet on the crank that the electronic ignition system uses first though.   Reading though the mfg sheets on this trigger though, it shows that you can pickup the edge without a magnet, because the denser material interuppts the magnetic force around the sensor.  Have you tried this?  

Russ  <!-- product category -->
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2007\08\08@095101 by Capt. Quirkn/a

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Capt. Quirk wrote:

Regarding the magnet on the crankshaft, use a small compass to determine its pole (needs to be south). For the gear tooth sensor, it requires a magnet to be glued to the back of the sensor. South side facing the back side of the sensor. (I have found the melexis to be more sensitive than other hall senors that were supposed to be, but I wouldn't trust no magnet at all)
It's funny to me that you mentioned the gear tooth sensor, just yesterday I modified a 48t gear and cut the teeth off to make it a 24 tooth gear (1 tooth for every 15'). I fitted it to my ignition test stand and glued the magnet to the sensor and then to my dismay, it was a stainless steel gear. OOPs.

Bill
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2007\08\08@131323 by Henrymoun/a

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Henrymou wrote:

shinny
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2007\08\11@033541 by Professorwizn/a

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Professorwiz wrote:

Bill,
I'm still going though that program! Thanks for all the comments in it.  It'll take me a while to digest it all.  
Bummer about the gear, too bad it wasn't at least 400 series stainless!

Russ
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2007\08\12@142333 by Capt. Quirkn/a

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Capt. Quirk wrote:

Russ,
Use DEBUG and walk through the subroutine "LCD_5_DIGITS" to see how it works. Originally I called "LCD_OUT" from LCD_5_DIGITS and had problems with __PRAM1, So I just added a LCD_OUT routine to the bottom of the routine.

Also here are the Hall Sensor pics I promised.

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2007\08\12@143026 by Capt. Quirkn/a

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Capt. Quirk wrote:

One other thing, there are 3 or 4 types of 1/4 - 32 spark plugs. Which one are you running and what %'s are you running of nitro and oil, and type of oil if you don't mind.

Thanks
Bill
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2007\08\12@143434 by Professorwizn/a

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Professorwiz wrote:

I'm running Amsoil 50:1 with gasoline, midgrade.  The plug I'm using doesn't have any markings on it.  It the one BME sells with their engines at a mear $28 each.. Ouch..  The ceramic breaks if you sneeze at them.  I've already purchased 2 more besides the one that was in the motor and I'm on the last one.  You have a good place to buy these, or perhaps a little better made?  
Russ
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2007\08\12@143541 by Professorwizn/a

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Professorwiz wrote:

Bill one more question, I take it that's a motor of your own design, are you able to buy just the jugs off the Zenoha or did you scavage those?

Russ
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2007\08\12@162749 by Capt. Quirkn/a

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Capt. Quirk wrote:

No that's a real Zenoah model airplane engine.

Are you running gasoline, so that you can race with the Zenoah G230's, 260's and Quickdraws etc. ?

Bill
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2007\08\12@170139 by Professorwizn/a

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Professorwiz wrote:

Bill,
No I'm not doing any racing.  I wanted a good running gasser for my Helicopter.  I've got a Raptor 60/90 that I use for aireal photography.  Using a nitro motor makes me keep moving around to get out of the smoke.  The nitro exhaust is also very corrosive, it eats the finish off the camera.  I've run a tube all the way back to the rear rotor to help that out, but I don't want to hang my Canon Xt unless I can't get the gasser working.  With the gas motor I can also get up to 40 min. a tank of flight time, with the nitro I get 15 min a tank.  That's barely enough time for me to get up align good enough and take a shot or 2, moving about to keep out of the smoke and all.  I just need to quit being cheap and get a good gasser heli like the Preditor that's made for this work, but I haven't had a paying job yet.  I've heard there are tons out there, but sorting all that out has taken up my entire summer flying season.. Now of course I'm involved with the Basic Stamp, and SX chips.

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2007\08\12@174636 by Capt. Quirkn/a

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Capt. Quirk wrote:

:jumpin:  Really Nice Picture :jumpin:  

Over 10 yrs ago I had a few chances to work with a guy that was using the GT74 Zenoah (an earlier model of the GT80) in his heli. He was looking for more power back then.

I can see why you need the 50:1 amsoil, but personally I think it's to big of a risk for your investment.

Bill
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2007\08\12@182716 by Capt. Quirkn/a

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Capt. Quirk wrote:

I wanted to show you my Ignition test stand. Soon I will have a degree wheel and timming light added to it. It's just a sewing machine motor and a Dayton speed control.

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2007\08\20@213127 by Capt. Quirkn/a

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Capt. Quirk wrote:

more rimfire info
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