MoreSense MS-05 CO₂ sensor – €63
This competitively priced sensor (€63 including shipping) measures CO₂, temperature and humidity using the Sensirion SCD40. Sensirion is a Swiss company known for reliable sensors with a long lifespan.
The sensor can optionally be connected to a WiFi network (not required) and linked via MQTT to many home automation systems, including Domoticz and Home Assistant. Both use autodiscovery, so the sensors are added automatically. Homey is supported as well – no MQTT server needed, just the free HomeyDuino app from the Homey App Store.
The built-in RGB LED turns green, orange or red depending on the CO₂ level, so you can judge the air quality quickly and easily and take action if needed. A second LED shows the WiFi status.
Save energy with smart ventilation
With this sensor you can control a ventilation system and save a considerable amount of energy: in winter, there's no need to extract your expensive warm air when it isn't necessary. Control is possible via your home automation system (Home Assistant, Domoticz, Homey), or directly via a WiFi smart plug with Tasmota firmware.
Built-in web server
The sensor has a built-in web server that shows the readings on clear gauges. Via the web server (accessible from your smartphone, tablet or PC) you can adjust all settings, and firmware updates are carried out user-friendly "over the air" (OTA).
On the setup page you can configure various parameters, such as the MQTT server and the link to a smart plug.
Features
- Sensirion SCD40 sensor for CO₂, temperature and humidity
- RGB LED: green, orange or red depending on the CO₂ level, plus a WiFi status LED
- Works stand-alone – WiFi is optional
- No subscription, no app and no cloud – everything stays under your own control
- MQTT with autodiscovery for Home Assistant and Domoticz
- Homey support via the free HomeyDuino app
- Direct ventilation control via a WiFi smart plug
- Built-in web server for readings, settings and OTA firmware updates
- Powered by a standard 5 V USB adapter and a 2-metre USB-C cable (both included) – or by a power bank (not included)
- 1-year warranty (under normal use)
- User manual and firmware: see Downloads