pdm

Crates.io	pdm
lib.rs	pdm
version
source	src
created_at	2025-04-13 16:19:03.059324+00
updated_at	2025-04-15 18:45:24.840671+00
description	Pulse Density Modulator
homepage
repository	https://github.com/lsartory/pdm
max_upload_size
id	1631953
Cargo.toml error:	TOML parse error at line 17, column 1 \| 17 \| autolib = false \| ^^^^^^^ unknown field `autolib`, expected one of `name`, `version`, `edition`, `authors`, `description`, `readme`, `license`, `repository`, `homepage`, `documentation`, `build`, `resolver`, `links`, `default-run`, `default_dash_run`, `rust-version`, `rust_dash_version`, `rust_version`, `license-file`, `license_dash_file`, `license_file`, `licenseFile`, `license_capital_file`, `forced-target`, `forced_dash_target`, `autobins`, `autotests`, `autoexamples`, `autobenches`, `publish`, `metadata`, `keywords`, `categories`, `exclude`, `include`
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L. Sartory (lsartory)

documentation

README

PDM

PDM (Pulse Density Modulator) is a library meant for digital-to-analog conversion in embedded systems, using a simple second-order delta sigma modulator. If no hardware PWM channels are available, this is a lightweight alternative.

This can be used, for example, to modulate the intensity of an LED.

Features

The library offers the following features:

Easy to use
Suitable for no_std environments
No external dependencies
Ultra-low RAM requirements
Supports the following types: u8, u16, u32, u64, i8, i16, i32, i64, f32, f64

Limitations

For good results, the output frequency must be high and stable in relation to the modulated signal frequency. An external low-pass filter may be necessary to remove noise, depending on the application.

Example

let mut pdm = pdm::Pdm::<u8>::new();
pdm.set_value(42);
loop {
    if pdm.update() {
        // Set output high
    } else {
        // Set output low
    }
    // Sleep until next iteration
}

Changelog

Date	Version	Changes
2025-04-15	1.0.0	Cleaner code structure
2025-04-13	0.1.0	Initial release

Commit count: 0

pdm