DigitalPotWrite(POT0_SEL, POT0_Dn);

//set the resistance of

POT0

DigitalPotWrite(POT1_SEL, POT1_Dn);

//set the resistance of

POT1

//DigitalPotWrite(BOTH_POT_SEL, BOTH_POT_Dn);

//set the resistance

of both potentiometers

//DigitalPotWrite(POT0_SHUTDOWN, POT0_Dn);

//put POT0 into shu

ntdowm mode, ignore the second parameter

//DigitalPotWrite(POT1_SHUTDOWN, POT1_Dn);

//put POT1 into shu

ntdowm mode, ignore the second parameter

//DigitalPotWrite(BOTH_POT_SHUTDOWN, BOTH_POT_Dn);

//put both potentio

meters into shuntdowm mode, ignore the second parameter

}

void DigitalPotWrite(int cmd, int val)

{

// constrain input value within 0 - 255

val = constrain(val, 0, 255);

// set the CS pin to low to select the chip:

digitalWrite(CS_PIN, LOW);

// send the command and value via SPI:

SPI.transfer(cmd);

SPI.transfer(val);

// Set the CS pin high to execute the command:

digitalWrite(CS_PIN, HIGH);

}

FAQ

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                             https://www.dfrobot.com/wiki/index.php/Dual_Digital_Pot_(100K)_SKU:_DFR0520 12‐8‐17