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-rw-r--r--libraries/SPI/examples/DigitalPotControl/DigitalPotControl.ino71
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diff --git a/libraries/SPI/examples/DigitalPotControl/DigitalPotControl.ino b/libraries/SPI/examples/DigitalPotControl/DigitalPotControl.ino
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-/*
- 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() {
- // 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);
- // 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);
-}