1  // Wire Master Writer
 2  // by Nicholas Zambetti <http://www.zambetti.com>
 3  
 4  // Demonstrates use of the Wire library
 5  // Writes data to an I2C/TWI slave device
 6  // Refer to the "Wire Slave Receiver" example for use with this
 7  
 8  // Created 29 March 2006
 9  
10  // This example code is in the public domain.
11  
12  
13  #include <Wire.h>
14  
15  void setup()
16  {
17    Wire.begin(); // join i2c bus (address optional for master)
18  }
19  
20  byte x = 0;
21  
22  void loop()
23  {
24    Wire.beginTransmission(4); // transmit to device #4
25    Wire.write("x is ");        // sends five bytes
26    Wire.write(x);              // sends one byte
27    Wire.endTransmission();    // stop transmitting
28  
29    x++;
30    delay(500);
31  }