When my shield is connected to the USB port and the serial monitor is NOT enabled the sketch resets about every three seconds. I know this because I have a scan counter displayed on an OLED.
If I enable the serial monitor or power the shield using an external USB power supply the sketch does not reset.
I am using a Nano.
The port is COM1
IDE version 1.8.13
Processor selected : ATmega328
Windows 7 Professi0onal Service pack 1, 64 bit
The protective foam is removed.
I tried to set the board in Bootloader mode. Same problem.
This happens no matter what sketch I run.
It happens with “bareminimun” and “blink”.
Do you have any ideas?
1: What shield are you using?
2: Does this sketch (or a previously loaded one) use the wachdog timer?
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