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 ...
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); ...
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