Miniature Wi-Fi CO2 Sensor Unit

ESP8285 device tracks CO2 data, optionally temperature, humidity, pressure, and more.

According to TeHyBug’s mini indoor sensor listing on Tindie, we spend 90% of our time indoors. While this percentage varies dramatically from person to person – and likely even day to day – the amount of CO2 we breathe in can reportedly have a significant impact on our health and well-being. Additionally, it can indicate whether or not your indoor airspace is getting enough external fresh air in to help reduce the spread of airborne diseases.

If you’d like a small, convenient method for measuring internal CO2 levels, then this sensor device may just fit the bill. Pricing for one starts at $65, and it comes with a CO2 sensor by default. Data output is an onboard ESP8285 chip over Wi-Fi.

A temperature/humidity/air pressure sensor is available as an option, and the device can be ordered with a small OLED display for local viewing. A 3D-printed enclosure is also available to protect it from indoor hazards.

This sensor comes flashed with TeHyBug firmware, but it can be re-flashed with EspHome or other code as expedient. Additional sensors can be connected via a four-pin 3.5mm audio-style jack, and two out of the four onboard buttons are free to use as needed. There’s even an onboard WS2812B LED to show a quick glance at air quality: green = good, yellow = OK, red bad. You can see this little device in action via the video below.

Jeremy Cook
Engineer, maker of random contraptions, love learning about tech. Write for various publications, including Hackster!
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