rotary-encoder

Rotary Encoder

demo.mp4

This repository contains an example of how to read the rotation/direction from a rotary encoder and display the value on a 4-digit 7-segment display.

Features

• Rotate left/right to adjust the counter value.
• Quickly press to clear the counter value.
• Press and hold to adjust the display brightness.

How to Run

To run the example, use the following command:

cargo run -p rotary-encoder

Notes

• The current implementation may be inefficient as it pulls values on every cycle, resulting in unnecessary CPU cycles being consumed. A more efficient approach would be to utilize a timer interrupt.
• Initially, I followed this tutorial and translated the original C implementation to Rust. However, this approach proved to be buggy and inaccurate, as it occasionally missed rotations and miss-detected the spin direction.
• Fortunately, I discovered a more accurate algorithm for rotary encoders here and subsequently found a library that implements it.