Motor Controller Testing

[Ether]

Originally Posted by DonRotolo

You can also attach a motor, a battery, and build this. No computer needed.

That looks like a fun project !

The date of your post is 11/05...

Has anyone has built one of these lately? Where did you get the parts and what was the total cost?

[slijin]

Originally Posted by Ether

That looks like a fun project !

The date of your post is 11/05...

Has anyone has built one of these lately? Where did you get the parts and what was the total cost?

We have something similar, courtesy of our electrical mentor. Unfortunately, I haven't had the time to become familiar with the circuit itself, so I can't provide many details.

Parts were salvaged from his inventory as a hobbyist; I believe total cost was in the $20 range.

[roystur44]

Here is ours. We use a y pwm cable to the Jags to test ganged motors. We use this device to test our prototypes, motor burn in and robot builds before the electronics go in. All the parts were from Radio Shack under $50

http://www.youtube.com/watch?v=ibuAAnxgExQ

https://picasaweb.google.com/1045493...18593684294434

http://www.youtube.com/watch?v=t-Tius1e10U

[sretter]

Originally Posted by roystur44

Here is ours. We use a y pwm cable to the Jags to test ganged motors. We use this device to test our prototypes, motor burn in and robot builds before the electronics go in. All the parts were from Radio Shack under $50

http://www.youtube.com/watch?v=ibuAAnxgExQ

https://picasaweb.google.com/1045493...18593684294434

http://www.youtube.com/watch?v=t-Tius1e10U

Hi, is there any chance that you/one of your teammates could explain a little about how you built it?
(I've seen it before and got excited, but I'm not exactly sure how to implement one ourselves)

Anyways nice idea!

[Gdeaver]

Pololu has several RC servo controllers.
http://www.pololu.com/catalog/category/12
I use one hooked to a lap top to run our motors when the C-rio and the programers are not available. Also can do analog conversions to check sensors. The app that runs on the pc is nice.

[roystur44]

Jameco has a tutorial about PWM:

http://www.jameco.com/Jameco/workshop/diy/pwm.html

http://www.dprg.org/tutorials/2005-11a/index.html

https://www.jameco.com/webapp/wcs/st...0001_120539_-1

[sretter]

Originally Posted by roystur44

Jameco has a tutorial about PWM:

http://www.jameco.com/Jameco/workshop/diy/pwm.html

http://www.dprg.org/tutorials/2005-11a/index.html

https://www.jameco.com/webapp/wcs/st...0001_120539_-1

Awesome thanks!

[DonRotolo]

Originally Posted by Ether

The date of your post is 11/05...

Has anyone has built one of these lately? Where did you get the parts and what was the total cost?

Parts are Radio Shack, cost was about $15 including a nice little case. Can be less fancy if you have a good junkbox.

Originally Posted by PAR_WIG1350

Why do you need a dual timer? Most circuit I have seen use a 555.

One timer generates the pulses every x milliseconds, the other varies the output pulse width from 1 to 2 mSec. If you try to do both with a single timer you end up varying a parameter you don't want to vary. Plus, a 556 is really no more expensive than a 555...

[Gdeaver]

Remember, any device a team makes or buys must be able to generate pulses beyond the 1 to 2 ms pulses that are the hobby standard for servos. The jag has an extended range I believe is .8 to 2.2 ms for full speed. 1 to 2 ms for a victor.
Debugging can issues is a whole other can of worms.