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co2mon-2.1.1
co2mon
A driver for the Holtek CO₂ USB monitors, tested using a TFA-Dostmann AIRCO2TROL 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 was reverse-engineered before.
The implementation was inspired by this one.
License
This project is licensed under either of
- Apache License, Version 2.0, (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)
- MIT license (LICENSE-MIT or http://opensource.org/licenses/MIT)
at your option.