UART TRANSFER BETWEEN TWO ARDUINO UNO R3

 

void setup() {

  // set push button pin as input

  pinMode(8, INPUT_PULLUP); 

  pinMode(13, OUTPUT);      

  digitalWrite(13, LOW);    

  Serial.begin(9600);       

}

void loop() {

  if (Serial.available()) {

    // read one byte from serial buffer and save to data_rcvd

    char data_rcvd = Serial.read();

     

    if (data_rcvd == '1') {

       digitalWrite(13, HIGH); 

    }

    if (data_rcvd == '0') {

     digitalWrite(13, LOW);  // switch LED Off

    }  

}

 if (digitalRead(8) == HIGH) {

     // send the char '0' to serial if button is not      pressed.

     Serial.write('0');

  }    

  else {

     // send the char '1' to serial if button is pressed.

    Serial.write('1');

  }

}