SPI Digipot Trouble

Other Hardware General Electronics
1

Hello,

I'm having trouble with the Digital Potentiometer Control tutorial.

I've setup the circuit and loaded the code onto my Arduino UNO verbatim as shown on the tutorial, but my LEDs aren't lighting up at all.

I'm using the exact same digipot (ADG5206) and I've verified that LED polarity is correct. When I measure the impedance across A and B for any channel on the digipot, I get a very high reading of a few Mega ohms, even though my digipot is 10kohm. This digipot does not have a shutdown pin.

Any help would be great.

2

Firstly you link to a tutorial using the AD5206 digipot, but then mention the ADG5206 high voltage mux chip which is utterly different. You may have completely wrong device.

BTW that tutorial is wrong, it doesn't have decoupling capacitor for the AD5206's supply pin.

3

MarkT:
Firstly you link to a tutorial using the AD5206 digipot, but then mention the ADG5206 high voltage mux chip which is utterly different. You may have completely wrong device.

BTW that tutorial is wrong, it doesn't have decoupling capacitor for the AD5206's supply pin.

Thanks for your reply. There's a typo in my original post. I'm using the correct AD5206 (not adG).

How should I connect a decoupling cap?

Also, anything else I can check for to troubleshoot this issue?

4

Post a decent photo showing how you have things wired up.

5

By the way you did measure the digipot resistance when it was powered up didn't you? The internal switches will all be completely off it is unpowered, so its meaningless to measure anything in that state.

6

Hi,
Welcome to the forum.

Please read the post at the start of any forum , entitled "How to use this Forum".
OR
http://forum.arduino.cc/index.php/topic,148850.0.html.

Then look down to item #7 about how to post your code.
It will be formatted in a scrolling window that makes it easier to read.

We need to see your code that you are using in your Arduino please.

Thanks..Tom.. :slight_smile: