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Topic: Sketch won't start (Read 378 times) previous topic - next topic


When I upload a sketch to my Arduino UNO r3, the sketch works fine. But as soon as I disconnect the usb cable and reconect it (or use a wall adapter) the L led (pin 13) then keeps flashing 3 times then off, then it repeats the 3 flashes indefinitely.

Coding Badly

Ensure the ATmega328P processor is well seated in the socket.

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