53 lines
1.5 KiB
C++
53 lines
1.5 KiB
C++
// 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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// ---------------------------------
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// Example from : http://www.arduino.cc/en/Tutorial/DigitalPotentiometer
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// Adapted to show usage of the SoftwareWire library
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// ---------------------------------
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#include <SoftwareWire.h>
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// SoftwareWire constructor.
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// Parameters:
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// (1) pin for the software sda
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// (2) pin for the software scl
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// (3) use internal pullup resistors. Default true. Set to false to disable them.
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// (4) allow the Slave to stretch the clock pulse. Default true. Set to false for faster code.
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//
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// Using pin 2 (software sda) and 3 (software scl) in this example.
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SoftwareWire myWire( 2, 3);
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void setup()
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{
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myWire.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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myWire.beginTransmission(44); // transmit to device #44 (0x2c)
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// device address is specified in datasheet
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myWire.write(byte(0x00)); // sends instruction byte
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myWire.write(val); // sends potentiometer value byte
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myWire.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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