Arduino-Development / hardware /arduino /avr /libraries /SPI /examples /DigitalPotControl /DigitalPotControl.ino
| /* | |
| Digital Pot Control | |
| This example controls an Analog Devices AD5206 digital potentiometer. | |
| The AD5206 has 6 potentiometer channels. Each channel's pins are labeled | |
| A - connect this to voltage | |
| W - this is the pot's wiper, which changes when you set it | |
| B - connect this to ground. | |
| The AD5206 is SPI-compatible,and to command it, you send two bytes, | |
| one with the channel number (0 - 5) and one with the resistance value for the | |
| channel (0 - 255). | |
| The circuit: | |
| * All A pins of AD5206 connected to +5V | |
| * All B pins of AD5206 connected to ground | |
| * An LED and a 220-ohm resisor in series connected from each W pin to ground | |
| * CS - to digital pin 10 (SS pin) | |
| * SDI - to digital pin 11 (MOSI pin) | |
| * CLK - to digital pin 13 (SCK pin) | |
| created 10 Aug 2010 | |
| by Tom Igoe | |
| Thanks to Heather Dewey-Hagborg for the original tutorial, 2005 | |
| */ | |
| // inslude the SPI library: | |
| // set pin 10 as the slave select for the digital pot: | |
| const int slaveSelectPin = 10; | |
| void setup() { | |
| // set the slaveSelectPin as an output: | |
| pinMode(slaveSelectPin, OUTPUT); | |
| // initialize SPI: | |
| SPI.begin(); | |
| } | |
| void loop() { | |
| // go through the six channels of the digital pot: | |
| for (int channel = 0; channel < 6; channel++) { | |
| // change the resistance on this channel from min to max: | |
| for (int level = 0; level < 255; level++) { | |
| digitalPotWrite(channel, level); | |
| delay(10); | |
| } | |
| // wait a second at the top: | |
| delay(100); | |
| // change the resistance on this channel from max to min: | |
| for (int level = 0; level < 255; level++) { | |
| digitalPotWrite(channel, 255 - level); | |
| delay(10); | |
| } | |
| } | |
| } | |
| void digitalPotWrite(int address, int value) { | |
| // take the SS pin low to select the chip: | |
| digitalWrite(slaveSelectPin, LOW); | |
| delay(100); | |
| // send in the address and value via SPI: | |
| SPI.transfer(address); | |
| SPI.transfer(value); | |
| delay(100); | |
| // take the SS pin high to de-select the chip: | |
| digitalWrite(slaveSelectPin, HIGH); | |
| } | |