Digital Potentiometer and Rotary Encoder Direct Control X9C103

How to control the X9C103 digital potentiometer directly from a rotary encoder with optional switch debouncing.

If you are only controlling one digital pot at a time and don’t need to store the setting for power on recall, you can just keep chip select enabled at all times. Otherwise another modification would be required for more features but this is just a simple hack.

The rotary encoder used here has 20 positions per one revolution and the digital pot has 100 wiper positions so this is in effect, a 5 turn multiturn pot as well!

Blooper List
- I think at one point I said 500 ms when I meant 500 µs but I think that’s easy enough to catch and filter out within context.

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