Controlling Digital Potentiometer AD5235

Using Arduino General Electronics
#1

I'm not officially lost!

Ive got a AD5235(http://www.analog.com/static/imported-files/data_sheets/AD5235.pdf) for replacing the volume dial in my audio amplifier.

I've got the thing wired up and coded as per this tut - http://www.arduino.cc/en/Tutorial/SPIDigitalPot#.UwdMqHna7wN - but it doesn't work. I see no change on the wiper reading.

I've tried using this one as well - http://www.reigndesign.com/blog/controlling-a-10-bit-digital-potentiometer-via-spi-with-arduino/

And, I've also tried this replicating this once - http://forum.arduino.cc/index.php/topic,85837.0.html

All to no avail.

This is all part of a home cinema project, and everything else is working bar this last bit.

Can someone offer me some support?

Thanks

Martin

#2

So what happens when you try to get it to work.

Did you make sure to pull the CS input on the chip low ?

#3

Did you consider that your AD5235 device is not the same as the AD5206 device in the tutorial ?

#4

Cs pin goes low before sending data each time.

I know one of them was for a 10-bit chip and mines is a 24-bit one, but it thought i'd give it a bash.

I get nothing when i try to get it to work.

As soon as power is applied to the chip the wiper locks at 125(1/2) on both channels and goes full when i remove power, so the chip IS working, i just can't control it.

This is my first time using Arduinos, so not 100% on the art of sending data in bits to devices.

#5