What was the last project that you were working on when it started failing?
const int myPin = A0;
void setup() {
Serial.begin(9600);
pinMode(3, OUTPUT);
pinMode(4, OUTPUT);
pinMode(5, OUTPUT);
}
void loop() {
int sensorValue = analogRead(myPin);
// Serial.print("Sensor value: ");
Serial.println(sensorValue);
}
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Have you tried the loopback test?
Yes, right now, here is video of test I recorded for you: https://youtube.com/shorts/icxc79RrWio?si=I-4HMDB6UsTaDhch
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When you press and release the reset button, what is the behaviour of the L LED before the board starts spamming the serial monitor.
*Blink *
Here is one more video recorded right now: https://youtube.com/shorts/gHPQc1Ctb4o?si=uVsYYIiXrwUPD6LB
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Do you have a second board or programmer?
Unfortunately no, can I just burn new bootloader via usb right on Uno?