Hi, everyone. I'm a newbie (though I've been following these forums for some time). I've never had to run the Arduino uno off an external power supply until now. So I connected the + ve terminal of the battery to the 2.1 mm barrel plug's centre connection and - ve to the outside connection. Nothing…

Uno external power supply problem

system April 1, 2014, 5:29pm 5

I get around 5 V between pin 1 and pin 2, 2.5 V between pin2 and pin3, 7.6 V between pin1 and pin3.

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