Serial Communication Between Two Arduino

1. Objective

The objective is talk about, serial communication between two Arduino that use serial port Tx and Rx. A Arduino is transmitter and another one is receiver. Transmitter push button send data 1 or 0 to receiver to control LED light.

2. Requirement

  • Arduino Uno x2
  • USB Cable x2
  • Breadboard
  • LED
  • Resistor (220Ohm or 330Ohm)
  • Button
  • Electronic Wire

3. Build Circuit Serial Communication

Build circuit like Fig1.1.

Fig1.1. Serial communication between two Arduino

Transmitter Code:
  
// Code by Tann Thona (24/04/2017)
// Transmitter Coder
int button = 13;
char inByte = '1';

void setup() {
  // put your setup code here, to run once:
  pinMode(button,INPUT_PULLUP);
  Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
  if(digitalRead(button)==0)
  {
    Serial.write(inByte);
    delay(100);
  }
  else
  {
    Serial.write('0');
    delay(100);
  }
}


Receiver Code:

// Code by Tann Thona (24/04/2017)
// Reciever Coder
int led = 13;
char inByte = '1';

void setup() {
  // put your setup code here, to run once:
  pinMode(led,OUTPUT);
  Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
  if(Serial.available())
  {
   inByte = Serial.read();
   if(inByte == '1')
   {
    digitalWrite(led,1);
   }
    else
    {
    digitalWrite(led,0);
    }
  }

}


4. Result

According to code above, if we push button transmitter send number 1 to receiver and LED is bright. Then if we release button transmitter send number 0 to receiver and LED is dark.








Royal University of Phnom Penh
Faculty of Engineering
Dep. Telecommunication and Electronic Engineering

Group Member:
1. Tann Thona
2. Thach Soveasna
3. Chhoy Noreath
4. Neth Channa
5. Mok Vira

Instructor: Prof. Chann Tola
Date: 24 April 2017