Hello everyone welcome to my first instructable.

In this instructables we are going to learn how to turn LEDs on and off using serial monitor.

Step 1: Gather the Parts

  • A breadboard
  • A LED
  • A 220 ohm resistor
  • An Arduino

Step 2: The Code

Upload the following code to your arduino:

void setup()


pinMode(13, OUTPUT);


while (!Serial);

Serial.println("Input 1 to Turn LED on and 2 to off");


void loop() {

if (Serial.available())


int state = Serial.parseInt();

if (state == 1)


digitalWrite(13, HIGH);

Serial.println("Command completed LED turned ON");


if (state == 2)


digitalWrite(13, LOW);

Serial.println("Command completed LED turned OFF");




Step 3: Wiring

Hookup all the components according to the circuit diagram above.

Step 4: Done

Now just connect the arduino to your PC now open the serial monitor (To do so navigate through tools>Serial monitor).

Now when you send 1 the LED turns on and turns off when you send 2.

Thanks for viewing. Please write your questions or suggestions below.

<p>Great intro to Arduino tutorial</p>
<p>good job boy </p>

About This Instructable




Bio: ........ :)
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