곽병세의 전자노트: 16. 두개의 아두이노 통신

개요:

아두이노 보드 2개를 연결하여 통신을 해보겠습니다.

Step1.

두개의 아두이노를 연결한다. A4와 A4, A5와 A5를 연결한다.

Step. 2

마스터 아두이노에 아래 소스를 업로드한다.

port는 10, device는 Arduino로 설정한다.

// Wire Master Writer

// by Nicholas Zambetti <http://www.zambetti.com>

// Demonstrates use of the Wire library

// Writes data to an I2C/TWI slave device

// Refer to the "Wire Slave Receiver" example for use with this

// Created 29 March 2006

// This example code is in the public domain.

#include <Wire.h>

void setup()

{

Wire.begin(); // join i2c bus (address optional for master)

}

byte x = 0;

void loop()

{

Wire.beginTransmission(8); // transmit to device #8

Wire.write("x is "); // sends five bytes

Wire.write(x); // sends one byte

Wire.endTransmission(); // stop transmitting

x++;

delay(500);

}

Step 3.

Slave Arduino에 아래 소스를 입력한다. 이때 port는 8로 설정한다.

// Wire Slave Receiver
// by Nicholas Zambetti <http://www.zambetti.com>

// Demonstrates use of the Wire library
// Receives data as an I2C/TWI slave device
// Refer to the "Wire Master Writer" example for use with this

// Created 29 March 2006

// This example code is in the public domain.

#include <Wire.h>

void setup()
{
Wire.begin(8); // join i2c bus with address #8
Wire.onReceive(receiveEvent); // register event
Serial.begin(9600); // start serial for output
}

void loop()
{
delay(100);
}

// function that executes whenever data is received from master
// this function is registered as an event, see setup()
void receiveEvent(int howMany) {
while (1 < Wire.available()) { // loop through all but the last
char c = Wire.read(); // receive byte as a character
Serial.print(c); // print the character
}
int x = Wire.read(); // receive byte as an integer
Serial.println(x); // print the integer
}