crehmann / co2logger

Simple CO2 logger written in MicroPython that broadcasts CO2, temperature and humidity measurements over mqtt. It also features a display to show the measurments and a buzzer to signal acoustically when a CO2 threshold ist exceeded.

CO₂ Logger

Simple CO₂ logger written in MicroPython that broadcasts CO₂, temperature and humidity measurements over mqtt (e.g. to HomeAssistant). It also features a display to show the measurments and a buzzer to signal acoustically when a CO₂ threshold ist exceeded.

Bill of materials

Qty	Name / Description
1	LOLIN D1 mini (or similar esp8266 MCU)
1	Sensirion SCD30 CO2 sensor
1	0.66" OLED display (64x48 pixel)
1	5V active buzzer
1	4 pin micro push button

Assembled Logger with display

(the mesh comes from an old kitchen sieve)