Let's Make Robots!

U7 got fried for some reason :(

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. 

Any ideas?

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Did you only connect the pwm pins? You need to connect the direction pins also to change the direction. Don't know if this could have caused the motor controller to burn up.

I did not connect the pins for direction, only PWM, i was simply testing the wheels to see if everything is ok. All of the wheels were connected identically, why would only one of them burn? i used the same setup again with the 3 remaining wheels, everything seems ok and all of them are turning in the same direction. 


Can you post a sharp picture of your setup? Where we can see the wiring?

The wiring is very basic, but i dont have a camera today. I can explain the wiring: 

the arduino is connected to the computer via usb, the 5V from arduino goes to the logic on the motor controller. All 4 motors are connected to their power source on the motor controller (the motor controller is connected to 6 AA 1.5V batteries). 4 PWM from the arduino are connected to the PWM of every motor. All grounds are connected to one main ground. nothing more nothing less. 

All 4 motors were connected identically, only one stopped working while the others are still fine.