Hello, i'm new in electronics. Today I was working in a 4 relay module conected to the arduino board, the board was connected to de USB port and relay module to the arduino power supply 5V. I don't know what happended but now the LED's "ON", "TX RX" are lightened in a lower level. Searching a solut…

Arduino UNO R3 power issue

LarryD April 1, 2014, 12:42am 3

Pull the controller and measure the 5 volt pin with a DVM

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