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Moved from arduino/Arduino#8711 by @Omar-alSuntawi
This code does not work correctly !
const byte ledPin = 13;
const byte interruptPin = 2;
volatile byte state = LOW;
void setup() {
pinMode(ledPin, OUTPUT);
pinMode(interruptPin, INPUT_PULLUP);
attachInterrupt(digitalPinToInterrupt(interruptPin), blink, CHANGE);
}
void loop() {
digitalWrite(ledPin, state);
}
void blink() {
state = !state;
}
which is on the Arduino Reference https://www.arduino.cc/reference/en/language/functions/external-interrupts/attachinterrupt/
It seems to accidentally read random values.