I am still new to physical computing but I am advanced in programming (hope so Wink ), so here is a question for the specialists in electronics, I think.
I have an Arduino Duemilanove with:
9V Batterie or USB-Power-suppy
two Tamiya motors with a 4,5 V power supply
a Pololu smc05a dual motorcontroller
Pololu:
(+) of the 4,5 V power supply to pin 1
pin2 to Arduino GND and power supply (-) /GND
pin3 5V from Arduino (measured, exactly 5 V)
pin 4 to Arduino pin 7 (Arduino software serial OUT)
Did anything ever happen (e.g. reverse polarity application; overheating, smoke coming out) that would support the notion that the motor controller is just broken? While these kinds of things can be destroyed easily if used the wrong way, many of the items we get back for repair actually work just fine. It sounds like you might be ready to give up, but if you don’t know of anything bad having happened to the unit, you could contact us to get an RMA number and send it back for us to check out.