/* Project: 15 HACKING BUTTONS */ //************************************************************* const int optoPin = 2;//optocoupler attached to digital pin 2 //************************************************************* void setup(){ pinMode(optoPin, OUTPUT);//sets optoPin as OUTPUT } void loop(){ digitalWrite(optoPin, HIGH);//optocoupler is on delay(15);//delay set for 15 ms digitalWrite(optoPin, LOW);//optocoupler is off delay(21000);//delay set for 21 seconds }