Introduction: Control LED Using Serial Monitor

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.


DIY+Hacks+and+How+Tos made it!(author)2016-07-01

Great intro to Arduino tutorial

Anshu+AR made it!(author)2016-07-01


khurram125 made it!(author)2017-03-23

good job boy

About This Instructable




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