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