I have an Arduino UNO connected to four relays (3 12v LEDs and 1 12v Motor relay). For simplicity I'm using the same 12v to Vin on the Arduinbo UNO as powers the LEDs and motor. I've built and tested using a 120VAC to 12VDC transformer for months. It works perfectly in that arrangement. When I cha…

Arduino program won't stay on when connected to a 12v battery

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