#usb-hid #co2 #holtek #airco2ntrol #zytemp

no-std co2mon

Driver for the Holtek ZyTemp CO₂ USB HID sensors

14 releases (7 stable)

2.1.1 Oct 2, 2021
2.1.0 Apr 16, 2021
2.0.3 Dec 19, 2019
2.0.2 Nov 27, 2019
0.1.0-alpha.4 Feb 3, 2019

#428 in Hardware support

41 downloads per month

MIT/Apache

29KB
330 lines

co2mon

Actions Status Latest Version API docs

A driver for the Holtek CO₂ USB monitors, tested using a TFA-Dostmann AIRCO2NTROL MINI sensor.

Permissions

On Linux, you need to be able to access the USB HID device. For that, you can save the following udev rule to /etc/udev/rules.d/60-co2mon.rules:

ACTION=="add|change", SUBSYSTEMS=="usb", ATTRS{idVendor}=="04d9", ATTRS{idProduct}=="a052", MODE:="0666"

Then reload the rules and trigger them:

udevadm control --reload
udevadm trigger

Note that the udev rule above makes the device accessible to every local user.

Quick start

cargo run --example watch

Releases

Release notes are available in CHANGELOG.md.

Protocol

The USB HID protocol is not documented, but is a superset of this one and was reverse-engineered before.

The implementation was inspired by this one.

License

This project is licensed under either of

at your option.

Dependencies

~405–790KB
~14K SLoC