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Topic: Power Supply (Read 2964 times) previous topic - next topic


Three batteries is only 4.5 volts, if each battery is 1.5 volts, which most are.
Andrew K.




I am using the uno smd. I found a old broken ac adapter with a right sized barrel plug for arduino. If i cut the cable and striped the two wire could i connect a power source that way? if so what would the required voltage be.


oops. I should of looked there first! would there a way to find out which wire is + and which is - for the barrel plug?


but how can i know what wire is connected to the inside pin?

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