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The original was posted on /r/homeassistant by /u/Team-Claratech on 2026-03-19 17:30:26+00:00.

I left reddit for very specific reasons, and it always feels a little greasy, dirty to open a reddit link. That said I copied the info from the link, with links included, so you have one less reason to go to reddit. SYAC!

Hi everyone,

We are Claratech, a small startup team of passionate engineers and home automation enthusiasts. We’re on a mission to develop products that enhance your smart home, maintain your privacy, and uphold your right to repair.

Meet the CAQM9 (the Claratech Air Quality Monitor 9). The number ‘9’ stands for the nine different parameters it tracks: CO2, PM1, PM2.5, PM10, TVOCs, Nitrous Oxides, temperature, humidity, and air pressure.

Compact, Silent, and Versatile

We designed the CAQM9 to be unobtrusive. By eliminating the need for a dedicated circulation fan, we got rid of the annoying humming noise common in other monitors.

Standalone Desktop Mode: We included a 0.96" OLED display, three dedicated RGB LEDs, and a buzzer alarm for set thresholds. Perfect for glancing at live readings while you work.

Headless Setup: Prefer it hidden away? Turn off the screen, LEDs, and buzzer, stick it in a corner, and let it silently feed granular data to Home Assistant.

🎥 See it in action: We've put together a short video playlist (https://www.youtube.com/watch?v=TbkinPzeYRk&list=PL2sxVTW66lnesmSGRpHSkXgIyr8qQsWC-) - demonstrating the CAQM9's features, desktop display, and how it handles live readings.

The Tech & Connectivity

Core: ESP32 (fully flash-able).

Connectivity: Comes pre-flashed with Tasmota. We utilize Tasmota’s Matter support for seamless, local discovery in Home Assistant. Standard MQTT is also fully supported.

The Sensors

Sensirion SGP41: Sensirion’s flagship, standalone dual-channel MOx sensor for TVOCs and NOx gases.

Bosch BME-280: The gold standard for measuring temperature, relative humidity, and barometric pressure.

Plantower PMS7003: Precision laser scattering PM sensor with a resolution of 0.3 micrometers.

MHZ-19E: A rock-solid NDIR CO2 sensor (range: 400-5000ppm, accuracy: +/-50ppm).

Open Hardware

You can build it yourself from scratch using our files, or you can grab a fully assembled and tested unit from us at caqm.io.(https://caqm.io/)

The Code: Our open-source Tasmota Berry driver is live on GitHub.(https://github.com/Devops-Claratech/CAQM9)

The Board: Full PCB schematic and routing are public on OSHWLab.(https://oshwlab.com/claratech/claratech-aqm9-mainboard)

The Enclosure: STLs are available to print yourself on Thingiverse (https://www.thingiverse.com/thing:7312753).

We look forward to your feedback on our first step toward an open-hardware home automation future. What other features or parameters would you like to see in a device like this?

— Team Claratech