Communicating with Arduino using Serial Communication | Arduino UNO | Tutorial | DIY Project

Communicating Arduino Using Serial Port Communication

In this tutorial we'll see, how to program Arduino to send and receive signals using serial ports. We'll send signals from PC to our UNO board, which will change the state of the LED and will return the current state.

Components Required

- 1 * Arduino UNO 

- 1 * USB Cable 

- 1 * LED 

- 1 * 220Ω Resistor 

- 1 * Breadboard 

- Several jumpers wires

Circuit Diagram

 

Procedure

1. Make the connections according to the circuit diagram.

2. Connect your Arduino UNO to PC.

3. Upload the code provided to the board using Arduino IDE.

4. Now go to tools > Serial Monitor. Try entering 0 and 1 alternatively to play with the LED.

Code

int ledpin=11;            //definition digital 11 pins as pin to control the LED

void setup()

{

  Serial.begin(9600);    // opens serial port, sets data rate to 9600 bps

  pinMode(ledpin,OUTPUT); //Set digital 11 port mode, the OUTPUT for the output

}

void loop()

{

    char receiveVal;                   // Defined receive data

   

    if(Serial.available() > 0)        //Receive serial data

    {        

        receiveVal = Serial.read();   //Save the serial data received 

        

       if(receiveVal == '1')          //Receive data is 1, lit LED lights    

       { 

           digitalWrite(ledpin,HIGH);  //print out the value of the LED       

           Serial.println("LED:ON");  //send data to the serial monitor

       }

       if(receiveVal == '0')           //Receive data is 0, off LED lights

       { 

           digitalWrite(ledpin,LOW);    //print out the value of the LED                

           Serial.println("LED:OFF"); //send data to the serial monitor

      } 

    }

  delay(50);                           //delay 50ms

}