This seems like it should have been asked before but I can't find anything in the search. I have 4 servos which require an external power supply to run. I am powering the arudino off the same power supply as it needs to have the same reference point for the PWM signal. The metal casing of of the US…

USB port earthing

system May 22, 2012, 2:40pm 3

Ok, thanks

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