On the Uno R4 Minima and Uno R4 WiFi, pin 13 is made an output after reset, so if you do: void setup() { Serial.begin(9600); delay(5000); } void loop () { Serial.println(digitalRead(13)); delay(1000); ...
Reading about FTDI programming with a bootloader: RS-232 chips use the DTR pin to reset the chip and enter the bootloader's firmware-receptive window: The DTR signal is present on pin 20 of the ...
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