#define PIN_LED 4
#define PIN_BUTTON 15
bool ledState = false;
void setup() {
// initialize digital pin PIN_LED as an output.
pinMode(PIN_LED, OUTPUT);
pinMode(PIN_BUTTON, INPUT);
}
// the loop function runs over and over again forever
void loop() {
if (digitalRead(PIN_BUTTON) == LOW) {
delay(20);
if (digitalRead(PIN_BUTTON) == LOW) {
reverseGPIO(PIN_LED);
}
while (digitalRead(PIN_BUTTON) == LOW);
}
}
void reverseGPIO(int pin) {
ledState = !ledState;
digitalWrite(pin, ledState);
}