tinkercat hardware interrupt

when button is pushed, red led turns on right away

volatile byte buttonState = LOW;

void setup()

{

  pinMode(7, OUTPUT);

  pinMode(9, OUTPUT);

  pinMode(2, INPUT);

  attachInterrupt(digitalPinToInterrupt(2), lightOn, CHANGE);

}

void loop()

{

  digitalWrite(9, HIGH);

  delay(2000);

  digitalWrite(9, LOW);

  delay(2000);

}

void lightOn(){

  buttonState = digitalRead(2);

  digitalWrite(7, buttonState);

}

reference:

https://www.arduino.cc/reference/en/language/functions/external-interrupts/attachinterrupt/

https://www.allaboutcircuits.com/technical-articles/using-interrupts-on-arduino/

https://www.youtube.com/watch?v=PIX6TZxukyo&list=PLKL6KBeCnI3X7cb1sznYuyScUesOxS-kL&index=9