PCA9685 RPPal

A rppal-based Rust library for interacting with the Adafruit PCA9685 16-channel PWM/Servo Driver on Raspberry Pi. This library wraps the lower-level I²C operations to simplify setting up the PCA9685 and controlling PWM channels.

Features

• Simple Initialization: Easily create and configure the PCA9685 device at its default I²C address (0x40).
• Frequency Control: Set the PWM frequency (in Hz) on all 16 channels simultaneously.
• Channel Control: Independently control each channel by specifying ON/OFF counts (0–4095).
• Bulk Control: Set PWM for all channels at once.

Getting Started

Prerequisites

• A Raspberry Pi with I²C enabled (see Raspberry Pi documentation for details).
• Rust (stable toolchain or later).
• rppal crate (installed automatically as a dependency).

Installation

Add the following to your project's Cargo.toml:

[dependencies]
pca9685-rppal = "0.1.0"

Usage

You can initialize a device, set the PWM frequency and control a single or all channels at once!

let mut pca = Pca9685::new()?;
pca.init()?;
pca.set_pwm_freq(50.0)?;

pca.set_pwm(0, 0, 1500)?;

pca9685.set_all_pwm(0, 0)?;

Thanks

Special thanks to the rppal crate for acting as a base to this crate and to adafruit_pwm_servo_driver for generic implementation details :)