Demonstration Program for two servo motors

magicmetal

I am not a programmer. Four years ago I built a simple servo motor demo board for my art students using a BASIC STAMP 2 and a UNL2803A ic to drive TWO small mitsumi motors. At the time I downloaded some code that made the motors rotate back and forth and then repeat the motion over and over again. I no longer have that code. Could anyone either write me a simple sketch or direct me to a site that has some sample code that I could download. Here is an attachment with a image of my board.

Martin_H

I can't help with code to control that IC, but if you replaced the motors with continuous rotation servos (they're about $12) you could use code off the internet.

For example this link shows how to control a servo using a pot with the basic stamp. Not quite what you are looking for, but perhaps better:

http://www.parallax.com/dl/docs/books/sw/exp/sw25.pdf
Also, the code inside this zip file off the internet archive of the CBA robot site:

http://web.archive.org/web/20060621075149/budgetbot.com/downloads/BS2e/CBA_Testing.zip

Contains the following test code for their basic stamp 2e, but it should be adaptable for your board:

'{$STAMP BS2e}
'{$PBASIC 2.5}
PulseWidth VAR Word
DO
FOR PulseWidth = 500 TO 1000 STEP 2
·· PULSOUT 12,PulseWidth
·· PULSOUT 13,PulseWidth
·· PAUSE 20
NEXT
FOR PulseWidth = 1000 TO 500 STEP 2
·· PULSOUT 12,PulseWidth
·· PULSOUT 13,PulseWidth
·· PAUSE 20
NEXT
LOOP

Post Edited (Martin_H) : 4/5/2010 11:31:19 AM GMT

Martin_H

Also, the picture is too small to see much detail. But those look like stepper motors not servo motors as you say in the text. If you want to stick with those we would need more details about them.

hover1

It looks like they may be the stepper motors that parallax sells. Documentation and sample code is on the bottom right of this pages:

·http://www.parallax.com/StoreSearchResults/tabid/768/txtSearch/stepper/List/0/SortField/4/ProductID/65/Default.aspx

Jim

magicmetal

My intent with my students is to demonstrate the programmable functions of 3 different motors types. Servo, Stepper and Variable Speed DC motors. I built three demo boards and the only one I am having trouble with is the two stepper motor set up with the ULH2803a ic/
so any code that would work with a BS2, two stepper motors and a uhl2803 ic would be greatly appreciated.
Thanks,

Ira

Franklin

Ira, Check out the post directly above your last post (hover1)

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- Stephen