Arduino Nano, Digital Pots, and Interfacing with Other Circuits

Using Arduino General Electronics
1

Hi, just started getting into Arduino, but ran into an issue with my first project. The project uses an Arduino Nano, MCP41100 100k Digital Pots, and a Guitar Pedal Circuit whose original pots function as a voltage divider (3.3v). There is also another pot that processes audio volume.

My issue is is that my arduino display (Adafruit LCD) goes bonkers whenever I try and interface my digipots with the guitar pedal circuits pot pads.

I noticed that it does not work when I try to connect the digipots A, W, B pins to the guitar pedal circuits' potentiometer pads whose function is a voltage divider (3.3v).

When I disconnect the guitar pedal circuit pads that divide the 3.3v and only connect the volume audio pads, my display works fine.

Am I right to assume that the Arduino Nano runs at 5v and is running into trouble with the 3.3v coming from the guitar pedal's pots pads?

2

No, the problem is something else.

3.3v on 5v arduino is fine.

3

Thanks for the confirmation! I put a different 9v to 5v regulator circuit in there and that seems to have fixed it!