co2-mini-monitor

An CUI application to log output of CO2Mini Indoor AirQuality Monitor or CUSTOM CO2 MONITOR CO2-mini to stdout.

$ co2-mini-monitor
{"time":"2021-03-13T12:41:26.632033+00:00","type":"co2","value":1100}
{"time":"2021-03-13T12:41:29.271876+00:00","type":"temp","value":21.7}
{"time":"2021-03-13T12:41:31.647808+00:00","type":"co2","value":1100}
{"time":"2021-03-13T12:41:34.295843+00:00","type":"temp","value":21.7}
{"time":"2021-03-13T12:41:36.671795+00:00","type":"co2","value":1104}
{"time":"2021-03-13T12:41:39.319682+00:00","type":"temp","value":21.7}
{"time":"2021-03-13T12:41:41.687658+00:00","type":"co2","value":1104}
{"time":"2021-03-13T12:41:44.335507+00:00","type":"temp","value":21.7}
{"time":"2021-03-13T12:41:46.711509+00:00","type":"co2","value":1108}

Note that this one does NOT handle packet decryption while it seems the packet is no longer encrypted in recent models. Use alternatives if you cannot get correct result due to the encryption.

Install

cargo install co2-mini-monitor

You may need to install the following to build hidapi-rs.

• libusb-1.0-0-dev
• libudev-dev
• libhidapi-dev

Usage example

InfluxDB

Use jq to parse and format data and curl to send data to influxdb like

#!/bin/bash
HOSTNAME="localhost:8086"
ORG="YOUR ORG"
BUCKET="YOUR BUCKET"
TOKEN="YOUR TOKEN"
/usr/local/bin/co2-mini-monitor \
  | /usr/local/bin/jq -r --unbuffered '"\(.type) value=\(.value) \(.time | fromdate)"' \
  | xargs -I{} curl --request POST \
    "http://$HOSTNAME/api/v2/write?org=$ORG&bucket=$BUCKET&precision=s" \
    --header "Authorization: Token $TOKEN" \
    --data-raw {}

See also

• co2monitor - CUI tool which handle packet decryption
• Reverse-Engineering a low-cost USB CO2 monitor - Project to reveal how the packet was encrypted

License

The code follows MIT license written in LICENSE. Contributors need to agree that any modifications sent in this repository follow the license.