[−][src]Crate co2mon

A driver for the Holtek (ZyAura ZG) CO₂ USB monitors.

The implementation was tested using a TFA-Dostmann AIRCO2TROL MINI sensor.

Example usage

let sensor = Sensor::open_default()?;
let reading = sensor.read_one()?;
println!("{:?}", reading);

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.

The serde feature enables serialization and deserialization support for the Reading and SingleReading structs.

The USB HID protocol is not documented, but was reverse-engineered before.

OpenOptions	Sensor open options.
Reading	A reading consisting of temperature (in °C) and CO₂ concentration (in ppm) values.
Sensor	Sensor driver struct.

Error	A possible error value when opening the sensor or taking a reading.
SingleReading	A single sensor reading.

A specialized Result type for the fallible functions.