kiwi-air-monitor

Kiwi air monitor is an open source CO2/Humidity/Temperature sensor intended for monitoring the indoor air quality. Kiwi air monitor was initiated by swat.engineering to support teachers and school organizations with the ventilation of the class rooms.

Features

• Monitor CO2, Humidity, Temperature, Atmospheric Pressure
• Display current measurements and its trend on a small display
• Blink a warning light if certain thresholds are reached (> 800ppm CO2 for example)
• Optionally: publish sensor readings to a (self hosted) MQTT server to allow building wide monitoring
• Optionally: partial remote control via MQTT
• Optionally: Updating firmware over wifi (OTA)
• Optionally: Docker-compose based Dashboard & MQTT server setup

Due to the cost-cutting concern, we have focussed more on precision instead of accuracy. Meaning that if a value increases, it should indeed represent an increase in that property, but it is acceptable to have a bias with respect to more expensive measurements. So you might get a temperature of 20.4 degrees C even though it iss actually 20.9 degrees C but if it increases to 20.5 degrees C it indeed is now 21.0 degrees C.

Hardware

The hardware is build around the ESP8266 platform. The costs (in the Netherlands) are roughly €45-50 per device. The list of components and schemas can be found in doc/NL/Hardware.md. We also provide a 3D model to print.

Documentation

Please check out the documentation for further details and instructions about hardware and software, and user manuals:

1. Dutch
2. English

Server

We've developed a small server setup (docker-compose based) so you can get started yourself. Checkout the server/ directory and the corresponding documentation.

License

The software and 3D models are all GPLv3 licensed. We use libraries with compatible licenses. See Software documentation for a list of which libraries are used.