Digital Potentiometer with SPI, Daisy Chain

Projects Networking, Protocols, and Devices
1

Hi everyone

I'm having problems connecting 3 digital Potentiometers with the Arduino UNO. I'm using the AD5290 from Analog Devices in a daisy chain configuration (see the data sheet)

https://www.analog.com/media/en/technical-documentation/data-sheets/AD5290.pdf

This is a one channel digi pot. I only want to raise the value of all three potentiometers to the maximum or minimum, to see if they work. Here is my code:

#include <SPI.h>

const int slaveSelectPin = 10;





void setup() {
  // set the slaveSelectPin as an output:
  pinMode(slaveSelectPin, OUTPUT);
  // initialize SPI:
  
  SPI.begin();
  
  SPI.setClockDivider(SPI_CLOCK_DIV4);



  digitalWrite(slaveSelectPin, LOW);
  //delay(100);

  
  SPI.transfer(255); // Data for the last Pot in the daisy chain
  SPI.transfer(255);
  SPI.transfer(255); // Data for the first pot in the daisy chain

  delay(100);

  
  digitalWrite(slaveSelectPin, HIGH);
}

void loop() {
  // put your main code here, to run repeatedly:

}

All three are in mid position and don't change at all!

Is the code correct? I only need to send the date three time for all pots in the daisy chain. They are all single channel, so I don't need to send a command byte, right?

What else could be wrong?

Thanks for your help

2

Remove the delay() from the code.

Set the clock divider to DIV8 (working at the maximum frequency is not a good idea).

Post a wiring diagram of your setup!