---
tags:
  - resource
created: 2025-07-06 23:38
---

## Summary

The PCA 9685 chip provides 16 channels of 12 bit PWM with a configurable PWM frequency for servo motor or LED control.
## Notes

Default I²C address for the PCA9685 board is 0x40.
## References

- https://crates.io/crates/pwm-pca9685 - supports setting address and 
- [`pca9685_rppal`](https://crates.io/crates/pca9685-rppal) - only supports default address of 0x40 and hides the I2C interface!
- https://docs.rs/pca9685-rppal/0.1.0/pca9685_rppal/index.html
- https://github.com/jlyonsmith/pca9685-rppal
- https://www.adafruit.com/product/815
- https://cdn-shop.adafruit.com/datasheets/PCA9685.pdf
- https://learn.adafruit.com/16-channel-pwm-servo-driver/hooking-it-up
- https://blog.eldruin.com/pca9685-pwm-led-servo-controller-driver-in-rust