In SX Microcontrollers, SX/B Compiler and SX-Key Tool, DosManDan wrote:

In the newer version of the board, I used a ground plane and also the 220Ohm resistor. Things are working fine, I'm just worried a problem might creep up since I never figured out the cause of the problem.

I experienced the SAME problem when I used a stand alone prototype board (push wire). If the ground were closer than about 2 inches, the problem started. When they were farther apart, everything worked fine. Basically, I simply moved the ground wire closer or farther appart.

I'm posting a new image of the bottom of the board so you can see what it looks like now.
Dan

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