Are my motors borked?
April 18, 2010
A couple weeks ago I posted about my Rebound RC car which I'm trying to make into a robot. I had trouble getting the motors running at the same speed. It was suggested that my H-bridge was bad, so now I've gotten a new one and am still having trouble.
I've simplified my code, so that it's not using PWM anymore. It simply enables both motors (by setting the enable pins on the H-bridge to "high"), and then starts both motors (by setting the input pins for the motors on the H-bridge to "high"). Again, the one motor went full speed and the other one didn't move - the exact same problem as last time. So I tried starting just one motor - the one that worked - and the both moved, at roughly the same speed. But randomly it would sputter and the LED that indicates my breadboard's power would suddenly dim for a second, and then the motors would continue.
Enabling the "bad" motor doesn't do anything - nothing moves, nothing sputters.
I'm powering the motors from a wall wart at about 15 V (I know it's way over the recommended voltage but I only leave them on for a second). I've got a working camera now too, so I can post pictures if needed.
Any suggestions would be much appreciated!