//----- Digital Pins ----- const int ledPin = 13; void setup() { Serial.begin(9600); printMessage("Starting experiment!"); pinMode(ledPin, OUTPUT); // Associate LED to pin as an actuator printMessage("Setup finished!"); } void loop() { Serial.println("*** BLINKING ***"); digitalWrite(ledPin, HIGH); // Turn the LED on delay(500); // Wait 0.5 second digitalWrite(ledPin, LOW); // Turn the LED off delay(500); }