| #include <Arduino.h> |
| /* |
| 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: |
| #include <SPI.h> |
| |
| |
| // set pin 10 as the slave select for the digital pot: |
| const int slaveSelectPin = 10; |
| |
| void setup(); |
| void loop(); |
| void digitalPotWrite(int address, int value); |
| 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); |
| delayMicroseconds(10); |
| } |
| // wait a second at the top: |
| delayMicroseconds(100); |
| // change the resistance on this channel from max to min: |
| for (int level = 0; level < 255; level++) { |
| digitalPotWrite(channel, 255 - level); |
| delayMicroseconds(10); |
| } |
| } |
| |
| } |
| |
| void digitalPotWrite(int address, int value) { |
| // take the SS pin low to select the chip: |
| digitalWrite(slaveSelectPin, LOW); |
| // send in the address and value via SPI: |
| SPI.transfer(address); |
| SPI.transfer(value); |
| // take the SS pin high to de-select the chip: |
| digitalWrite(slaveSelectPin, HIGH); |
| } |
| |