U7 got fried for some reason :(
March 8, 2012
I just got my Dagu 4 Channel Motor Controller, already a small part gave some smoke and one motor channel is not working anymore.
All four wheels were turning at the same time before the channel4 got fried.
VCC to Arduino 5V
4 PWM on the motor controller to 4 PWMs on the Arduino uno.
All grounds on both controllers where connected.
6*1.5V Alkaline AA to Vbat on the motor controller(connected after all the other connections).
After uploading a simple code with PWM set to 75, all wheels were turning until smoke came from U7 chip and i unplugged everything.
Repeated the same thing again, all 3 motors are still working, so why did U7 burn, i have no idea.