#define LED_PIN 21
#define BUTTON_PIN 35
void setup() {
pinMode(LED_PIN, OUTPUT);
pinMode(BUTTON_PIN, INPUT_PULLUP);
}
void loop() {
if (digitalRead(BUTTON_PIN)) {
digitalWrite(LED_PIN, HIGH);
}else{
digitalWrite(LED_PIN, LOW);
}
delay(10); // this speeds up the simulation
}