source: arduino-1-6-7/trunk/fuentes/arduino-ide-amd64/hardware/arduino/avr/libraries/SPI/examples/DigitalPotControl/DigitalPotControl.ino @ 4837

Last change on this file since 4837 was 4837, checked in by daduve, 2 years ago

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1/*
2  Digital Pot Control
3
4  This example controls an Analog Devices AD5206 digital potentiometer.
5  The AD5206 has 6 potentiometer channels. Each channel's pins are labeled
6  A - connect this to voltage
7  W - this is the pot's wiper, which changes when you set it
8  B - connect this to ground.
9
10 The AD5206 is SPI-compatible,and to command it, you send two bytes,
11 one with the channel number (0 - 5) and one with the resistance value for the
12 channel (0 - 255).
13
14 The circuit:
15  * All A pins  of AD5206 connected to +5V
16  * All B pins of AD5206 connected to ground
17  * An LED and a 220-ohm resisor in series connected from each W pin to ground
18  * CS - to digital pin 10  (SS pin)
19  * SDI - to digital pin 11 (MOSI pin)
20  * CLK - to digital pin 13 (SCK pin)
21
22 created 10 Aug 2010
23 by Tom Igoe
24
25 Thanks to Heather Dewey-Hagborg for the original tutorial, 2005
26
27*/
28
29
30// inslude the SPI library:
31#include <SPI.h>
32
33
34// set pin 10 as the slave select for the digital pot:
35const int slaveSelectPin = 10;
36
37void setup() {
38  // set the slaveSelectPin as an output:
39  pinMode(slaveSelectPin, OUTPUT);
40  // initialize SPI:
41  SPI.begin();
42}
43
44void loop() {
45  // go through the six channels of the digital pot:
46  for (int channel = 0; channel < 6; channel++) {
47    // change the resistance on this channel from min to max:
48    for (int level = 0; level < 255; level++) {
49      digitalPotWrite(channel, level);
50      delay(10);
51    }
52    // wait a second at the top:
53    delay(100);
54    // change the resistance on this channel from max to min:
55    for (int level = 0; level < 255; level++) {
56      digitalPotWrite(channel, 255 - level);
57      delay(10);
58    }
59  }
60
61}
62
63void digitalPotWrite(int address, int value) {
64  // take the SS pin low to select the chip:
65  digitalWrite(slaveSelectPin, LOW);
66  //  send in the address and value via SPI:
67  SPI.transfer(address);
68  SPI.transfer(value);
69  // take the SS pin high to de-select the chip:
70  digitalWrite(slaveSelectPin, HIGH);
71}
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