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Yongchang He
Yongchang He

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Set up a wired serial communication between Arduino boards

This blog explains how to set up wired serial communication between two Arduino boards.

This tutorial is meant for those with some knowledge of Arduino and IoT.
The purpose of building this blog is to write down the detailed operation history and my memo for learning the Arduino.
If you are also interested and want to get hands dirty, just follow these steps below and have fun!~

Tools will be used:

  • Two Arduino boards (e.g., mines are yún and 101)
  • Jump wires (Two are enough)


  • Boards are firmly connected via USB to computers
  • Boards drivers are properly installed
  • Ports are identified by the computers
  • Jump wires connect one's TX with another's RX, and one's RX with another's TX

Getting Started

Code for the master board (Arduino 101):

Send integer data to slave board

void setup() {
  // Begin the Serial at 9600 Baud

int thisByte = 33;

void loop() {
  Serial1.write(thisByte); //Write the serial data
  if (thisByte == 126) {    // you could also use if (thisByte == '~') {
     //This loop loops forever and does nothing
     // holds
    while (true) {
    //thisByte = 32;
  // go on to the next character
  thisByte ++;
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Code for slave board (Arduino yún)

Receive data from the master board, and print the data to console

int incomingByte = 0;  

void setup() {
  // Begin the Serial at 9600 Baud
void loop() {
  // send data only when you receive data:
  if (Serial1.available() > 0) {
  // read the incoming byte:
     incomingByte =;
     // say what you got:
     Serial.print("Received:  ");
     Serial.print("    DEC:  ");
     Serial.print(incomingByte, DEC);
     Serial.print("    HEX:  ");
     Serial.print(incomingByte, HEX);
     Serial.print("    OCT:  ");
     Serial.print(incomingByte, OCT);
     Serial.print("    BIN:  ");
     Serial.print(incomingByte, BIN);
     Serial.println(" ");
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Part of the Results

Image description

Trouble Shooting

  1. Install Arduino IDE to Linux and enable serial ports
  2. Official docs for serial communication


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