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'[OT]: Competitions..'
2001\04\07@141333 by Milan Pavlica (YU7AEC)

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Hello to everyone!
Does anyone know is there any competitions about electronics?
I am student of electrotehnical school in Yugoslavia and I am interested
in competitions about electronics ...
Is there any inos on internet??
Thanks!



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fn:Milan Pavlica
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2001\04\07@182501 by Dincer Aydin

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Hello Milan,

Saturday, April 07, 2001, 9:11:28 PM, you wrote:

MPY> Hello to everyone!
MPY> Does anyone know is there any competitions about electronics?
MPY> I am student of electrotehnical school in Yugoslavia and I am interested
MPY> in competitions about electronics ...
MPY> Is there any inos on internet??
MPY> Thanks!


The Circuit Cellar magazine always seems to have one these days. Check
out their website at http://www.circuitcellar.com/

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2001\04\08@064428 by James Newton

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There is always a design challenge and competition going at
http://www.sxlist.com

The next one will start next month and will probably involve embedded
internet applications or inexpensive but useful robotics.

Ideas?
What do we want to hook to the internet today?

or

Little robots with whiskers and hammers to "hunt" and smash nuts?

Let me know if you have contest ideas...

James Newton
1-619-652-0593 phone
jamesnewtonspamKILLspamsxlist.com
Ubicom code http://www.sxlist.com

{Original Message removed}

2001\04\08@083808 by Roman Black

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James Newton wrote:
>
> There is always a design challenge and competition going at
> http://www.sxlist.com
>
> The next one will start next month and will probably involve embedded
> internet applications or inexpensive but useful robotics.
>
> Ideas?

How about a one-PIC (or SX) solution to drive a stepper
motor with proper microstepping PWM with just
step/direction inputs? I'm only mentioning it because
i've already done it. ;o)

Seriously after visiting many robotics sites i've
noticed a lack of longer range distance sensing stuff.
You can get the Sharp module to do a couple of feet
range, but nothing good for longer ranges. Maybe a
time-of-flight laser system or a laser dot and linear
array (triangulation) system. So a robot or machine
can measure distances common in a house or building.
-Roman

PS. I put up that encoder circuit you wanted:
http://www.ezy.net.au/~fastvid/encoder.htm

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2001\04\08@112153 by Dan Michaels

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Roman Black wrote:
......
>Seriously after visiting many robotics sites i've
>noticed a lack of longer range distance sensing stuff.

ultrasonics ?????

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2001\04\08@234221 by Russell McMahon

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> How about a one-PIC (or SX) solution to drive a stepper
> motor with proper microstepping PWM with just
> step/direction inputs? I'm only mentioning it because
> i've already done it. ;o)

Me too - we can split the prize - what is it James ? :-)
I actually do variable speed microstepping between selected positions as an
internal part of a system.

.


Russell McMahon

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2001\04\09@005756 by James Newton

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Actually, I'm very interested in this "encoderless" DC motor drive that
Roman and a few others mentioned. Scott Dattalo has a page on "Magic
Sinewave" PWM that might help to reduce the noise from the drive signal and
help to not miss the pulses back from the commutation.

If anybody seriously thinks it can be done, I'll offer the standard "Your a
PIC guru" announcement on the site and a write up, etc...

James Newton, PICList Admin #3
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{Original Message removed}

2001\04\09@024249 by Vasile Surducan

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Applicable to unipolar steppers, without any other external smart device
(excluding power transistors ) ?
Vasile


On Mon, 9 Apr 2001, Russell McMahon wrote:

{Quote hidden}

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2001\04\09@024705 by Chris Carr

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James Newton Wrote:

> Actually, I'm very interested in this "encoderless" DC motor drive that
> Roman and a few others mentioned. Scott Dattalo has a page on "Magic
> Sinewave" PWM that might help to reduce the noise from the drive signal
and
> help to not miss the pulses back from the commutation.
>
> If anybody seriously thinks it can be done, I'll offer the standard "Your
a
> PIC guru" announcement on the site and a write up, etc...
>
It can be done, the reason I know is that I did play around with an IC
produced by Nat Semi (I believe) some time ago that controlled a DC motor by
counting the commutator pulses. Unfortunately I cannot remember the number
and it must have been withdrawn as nothing appears on their web site that I
can find. (on the other hand it could have been another manufacturer)

If I remember correctly the datasheets/app notes covered a description of
the chips operation. This information could be valuable in implementing a
pic solution. As this appears to be of interest I will spend some time
hunting round the dusty sections of the library and the darker recesses of
the junk box to see if I can find any residuals of the assessment exercise
(it never got to being a project). As I remember it, a breadboard was
produced, but use of the chip was abandoned as its cost was too high to
incorporate in any attractively priced product.

Don't hold your breath, but if you are still interested in a weeks time and
I (or someone else) haven't posted a follow up by then, give me a gentle
nudge.

Perhaps we should change the subject line of this thread to something more
appropriate such as DC Motor Control ?

Regards

Chris

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2001\04\09@053652 by Roman Black

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Vasile Surducan wrote:
>
> Applicable to unipolar steppers, without any other external smart device
> (excluding power transistors ) ?
> Vasile

I can't speak for Russell's unit but mine
is a linear ustep system using 2x fast PWM for
the two motor coil transistors (current) and
four more transistors for the phase switching.
-Roman

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2001\04\09@142244 by jamesnewton

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The prize is fame! Your name in lights! Your code posted at piclist.com! It
makes you a hero to the newbie.

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{Original Message removed}

2001\04\10@025355 by Vasile Surducan

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James, maybe you convince Mike Predko to donate you some of his
pic-related book for the prize...( btw, I presume inside of them are some
functional routines, better than 16 bit fixed point division routine on
his site xwhich is not working...)
If you have a positive answer maybe I'll enter in this game too...
Vasile

On Mon, 9 Apr 2001, James Newton wrote:

> The prize is fame! Your name in lights! Your code posted at piclist.com! It
> makes you a hero to the newbie.
>
> ---
> James Newton (PICList Admin #3)
> jamesnewtonspamspam_OUTpiclist.com 1-619-652-0593
> PIC/PICList FAQ: http://www.piclist.com or .org
>
> {Original Message removed}

2001\04\10@080211 by Chris Carr

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>>===========
>>It can be done, the reason I know is that I did play around with an IC
>>produced by Nat Semi (I believe) some time ago that controlled a DC
>>motor by counting the commutator pulses. Unfortunately I cannot
>>remember the number and it must have been withdrawn as nothing >>appears
>>on their web site that I can find. (on the other hand it could have
>>been another manufacturer)
>>===========

>LM628 perhaps?

>http://www.national.com/pf/LM/LM628.html

>Check out the appnotes also.

Hi Pablo. Unfortunately that is not the IC I had in mind as the LM628/9
require some form of encoder to provide the feedback signal. The IC I was
thinking about obtained a feedback signal by monitoring the current spikes
produced by the motors commutator.

By the way the small cheap "model" motors produce far too much rubbish for
the technique to work with them.

Swiss and other high quality motors, also larger motors worked OK.

Regards

Chris

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2001\04\10@225545 by myke predko

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Boy, I finish checking my mail at 2:00 AM last night and look what comes in
at 2:05AM.

First things first - what's wrong with the 16 bit division routine?  I know
there was a problem some time ago, but I thought I had fixed it...  Please
check my web site to make sure the updated version is wrong (I have also
updated it to the same code in the tear sheets for the next printing of the
PICmicro book so if it is still in error, I want to know about it).


I've been watching the idea of the competition and I like the idea of it.  I
would also be happy to donate prizes to it.  I would also be happy to place
the write ups for the winning applications on the CD-ROMs of subsequent
books or even put together a book of winning entries.

My major comment about this thread is that I haven't really seen any
projects as yet that really capture my imagination.  The microstepping
application is okay, but it doesn't set my shorts on fire.

I almost feel like part of the competition should be coming up with the best
project ideas...


Anyway, I have been thinking about this since it first came up and the only
reason why I've been quiet is because I haven't seen any really great
projects and I haven't been able to come up with any on my own.

myke

----- Original Message -----
From: "Vasile Surducan" <KILLspamvasileKILLspamspamL30.ITIM-CJ.RO>
To: <RemoveMEPICLISTTakeThisOuTspamMITVMA.MIT.EDU>
Sent: Tuesday, April 10, 2001 2:05 AM
Subject: Re: [OT]: Competitions..


> James, maybe you convince Mike Predko to donate you some of his
> pic-related book for the prize...( btw, I presume inside of them are some
> functional routines, better than 16 bit fixed point division routine on
> his site xwhich is not working...)
> If you have a positive answer maybe I'll enter in this game too...
> Vasile
>
> On Mon, 9 Apr 2001, James Newton wrote:
>
> > The prize is fame! Your name in lights! Your code posted at piclist.com!
It
> > makes you a hero to the newbie.
> >
> > ---
> > James Newton (PICList Admin #3)
> > spamBeGonejamesnewtonspamBeGonespampiclist.com 1-619-652-0593
> > PIC/PICList FAQ: http://www.piclist.com or .org
> >
> > {Original Message removed}

2001\04\11@024750 by Vasile Surducan

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Ok Myke, you're a nice person...
I will check again your site for division rutine.

On Tue, 10 Apr 2001, myke predko wrote:

>
> My major comment about this thread is that I haven't really seen any
> projects as yet that really capture my imagination.  The microstepping
> application is okay, but it doesn't set my shorts on fire.
>

 What do you say about a pic application which will keep you forever
young and happy ? hm?

 Thank's, Vasile

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2001\04\11@045325 by Roman Black

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myke predko wrote:

> I've been watching the idea of the competition and I like the idea of it.  I
> would also be happy to donate prizes to it.  I would also be happy to place
> the write ups for the winning applications on the CD-ROMs of subsequent
> books or even put together a book of winning entries.
>
> My major comment about this thread is that I haven't really seen any
> projects as yet that really capture my imagination.  The microstepping
> application is okay, but it doesn't set my shorts on fire.
>
> I almost feel like part of the competition should be coming up with the best
> project ideas...
>
> Anyway, I have been thinking about this since it first came up and the only
> reason why I've been quiet is because I haven't seen any really great
> projects and I haven't been able to come up with any on my own.


Hi, i only suggested the microstepping thing as a
joke as I had already done it. I wouldn't enter
previous work in a competition, that's rude.

Maybe as another suggestion for a competition
idea, what about a universal semiconductor tester?
Like three leads, A,B,C, and a 2-line LCD display.
You can clip it on any transistor or diode and
it tells which leg is which, NPN, PNP, fet,
darlington, etc etc, even measures beta and
saturation drop. All these things would be easy
to measure if you could adjust voltages and measure
voltages, say with a 16F876 or even a F628.
Just an idea. Hey, i'd like one!!
-Roman

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2001\04\11@123316 by Dan Michaels

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Roman Black wrote:

>Maybe as another suggestion for a competition
>idea, what about a universal semiconductor tester?
>Like three leads, A,B,C, and a 2-line LCD display.
>You can clip it on any transistor or diode and
>it tells which leg is which, NPN, PNP, fet,
>darlington, etc etc, even measures beta and
>saturation drop. All these things would be easy
>to measure if you could adjust voltages and measure
>voltages, say with a 16F876 or even a F628.
>Just an idea. Hey, i'd like one!!


Darn you, Roman, you been reading my notebooks again?

- dan michaels
http://www.oricomtech.com
======================

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2001\04\11@133337 by jamesnewton

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Sounds like something that could easily be added to Tony Nixon's Pocket
Programmer

www.piclist.com/techref/auction.asp?a=cat&c=17
http://www.bubblesoftonline.com/pocket/pocket.html

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{Original Message removed}

2001\04\11@135635 by Dan Michaels

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I don't think so - :)
==========================

James Newton wrote:
{Quote hidden}

>{Original Message removed}

2001\04\11@190901 by David Duffy

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Roman wrote:
>Maybe as another suggestion for a competition
>idea, what about a universal semiconductor tester?
>Like three leads, A,B,C, and a 2-line LCD display.
>You can clip it on any transistor or diode and
>it tells which leg is which, NPN, PNP, fet,
>darlington, etc etc, even measures beta and
>saturation drop. All these things would be easy
>to measure if you could adjust voltages and measure
>voltages, say with a 16F876 or even a F628.
>Just an idea. Hey, i'd like one!!

Farnell have one for AU$190 + tax at the moment.
Silicon Chip magazine did one a few years ago.
I probably have the article around here somewhere.
Never did get around to building it - should have. :-)
Regards...

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2001\04\12@084517 by Roman Black

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David Duffy wrote:
>
> Roman wrote:
> >Maybe as another suggestion for a competition
> >idea, what about a universal semiconductor tester?
> >Like three leads, A,B,C, and a 2-line LCD display.
> >You can clip it on any transistor or diode and
> >it tells which leg is which, NPN, PNP, fet,
> >darlington, etc etc, even measures beta and
> >saturation drop.

> Farnell have one for AU$190 + tax at the moment.
> Silicon Chip magazine did one a few years ago.
> I probably have the article around here somewhere.
> Never did get around to building it - should have. :-)


Yeah but the (overpriced) Farnell one does not
do the beta and saturation drop, the things I am
always having to test manually. and it's not as
though they are hard to measure...
-Roman

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2001\04\12@115946 by Dan Michaels

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Roman wrote:

>Yeah but the (overpriced) Farnell one does not
>do the beta and saturation drop, the things I am
>always having to test manually. and it's not as
>though they are hard to measure...


Roman, if you want a cheaper transistor tester that will do betas,
jameco.com sells a kit from Elenco for $24.95 USD, P/N 119360.
Touted as doing circuit testing, too. It apparently does not ID
the leads or device type automatically, however.

Anyone used this device?

- dan michaels
http://www.oricomtech.com
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