On the Arduino dock 2, GPIO 19 of Omega2 is connected to the MCU_RESET circuit for software resetting the ATmega. Therefore, the 19 on the Expansion Header is grounded and should not be used for anything but ground. In addition, GPIO 19 on the Omega2 should be kept LOW or it will keep on resetting the MCU.
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RE: Omega 2 and Arduino dock.posted in Omega Talk