A am leading towards the EasyDriver as the UNO serial monitor does work but would like a little nod if there is a way to check either.
Also, why would it cook the XXXXX when using a Car Battery as my power source?
QuoteA am leading towards the EasyDriver as the UNO serial monitor does work but would like a little nod if there is a way to check either.Using a multimeter you can check the 3V3 and 5V supplies to make sure they are working. You can also use a LED (with current limiting resistor) to check each out of the I/O pins. Without doing some testing it is difficult to say what is or isn't broken. However, your current assessment seems correct. QuoteAlso, why would it cook the XXXXX when using a Car Battery as my power source?The car battery provided significantly more current than your 12V supply. Your 12V supply had a current limit (or capacity) of 1A. It probably provided more. The car battery is capable of suppling significantly more current (10s of Amps).Are you sure you did not connect the Car Battery backwards? The Uno has a diode to help protect in reverse voltage conditions. The other board probably did not.
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