/***********************Circuit Connections*******************

Digital Pot

|

Arduino UNO R3

|

Oscilloscope

CS

|

D10 (SS)

|

SI

|

D11 (MOSI)

|

CLK

|

D13 (SCK)

|

VCC,PA0,PA1

|

VCC

|

GND,PB0,PB1

|

GND

|

CH1- CH2-

W0

|

|

CH1+

W1

|

|

CH2+

************************************************************/

/***********************Notice********************************

1.Resistor terminals A, B and W have no restrictions on

polarity with respect to each other.

2.Current through terminals A, B and W should not excceed ±1mA.

3.Voltages on terminals A, B and W should be within 0 - VCC.

************************************************************/

#include <SPI.h>

/***********************PIN Definitions*************************/

// set pin 10 as the slave select for the digital pot:

const int CS_PIN = 10;

/***********************MCP42XXX Commands************************/

//potentiometer select byte

const int POT0_SEL = 0x11;

const int POT1_SEL = 0x12;

const int BOTH_POT_SEL = 0x13;

//shutdown the device to put it into power-saving mode.

//In this mode, terminal A is open-circuited and the B and W terminals are sh

orted together.

//send new command and value to exit shutdowm mode.