char Incoming_value = 0; //Variable for storing Incoming_value void setup() { Serial.begin(9600); //Sets the data rate in bits per second (baud) for serial data transmission pinMode(13, OUTPUT); //Sets digital pin 13 as output pin } void loop() { if(Serial.available() > 0) { Incoming_value = Serial.read(); //Read the incoming data and store it into variable Incoming_value Serial.print(Incoming_value); //Print Value of Incoming_value in Serial monitor Serial.print("\n"); //New line if(Incoming_value == '1') //Checks whether value of Incoming_value is equal to 1 digitalWrite(13, HIGH); //If value is 1 then LED turns ON else if(Incoming_value == '0') //Checks whether value of Incoming_value is equal to 0 digitalWrite(13, LOW); //If value is 0 then LED turns OFF } }