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root / arduino-1.0 / libraries / Wire / examples / digital_potentiometer / digital_potentiometer.ino @ 58d82c77

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// I2C Digital Potentiometer
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// by Nicholas Zambetti <http://www.zambetti.com>
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// and Shawn Bonkowski <http://people.interaction-ivrea.it/s.bonkowski/>
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// Demonstrates use of the Wire library
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// Controls AD5171 digital potentiometer via I2C/TWI
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// Created 31 March 2006
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// This example code is in the public domain.
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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 val = 0;
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void loop()
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{
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  Wire.beginTransmission(44); // transmit to device #44 (0x2c)
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                              // device address is specified in datasheet
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  Wire.write(byte(0x00));            // sends instruction byte  
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  Wire.write(val);             // sends potentiometer value byte  
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  Wire.endTransmission();     // stop transmitting
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  val++;        // increment value
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  if(val == 64) // if reached 64th position (max)
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  {
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    val = 0;    // start over from lowest value
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  }
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  delay(500);
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}
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