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// Wire Master Writer
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// by Nicholas Zambetti <http://www.zambetti.com>
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// Demonstrates use of the Wire library
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// Writes data to an I2C/TWI slave device
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// Refer to the "Wire Slave Receiver" example for use with this
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// Created 29 March 2006
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// This example code is in the public domain.
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#include <Wire.h>
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void setup()
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{
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  Wire.begin(); // join i2c bus (address optional for master)
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}
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byte x = 0;
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void loop()
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{
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  Wire.beginTransmission(4); // transmit to device #4
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  Wire.write("x is ");        // sends five bytes
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  Wire.write(x);              // sends one byte  
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  Wire.endTransmission();    // stop transmitting
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  x++;
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  delay(500);
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}