Hello all, I built a circuit board recently that was designed to have an atmega328 communicate with a SM130 RFID Chip. I'm received my boards and assembled them, but they're acting very strangely. Whenever I try a program on the commercial UNO board, it works fine. If I remove that microcontroller …

Mystery Problem with Standalone Arduino

CrossRoads May 22, 2014, 6:16pm 6

Especially the xtal caps - if they are larger than 22pF, that will keep the xtal from oscillating.

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