AirNet CO2 is a low-power, relatively affordable sensing device featuring an ePaper display, designed to monitor CO2 concentration, temperature, and relative humidity.
Warning
This is a work in progress.
The device is designed for low-power battery operation. It is based on an ultra-low-power STM32U031 microcontroller. CO2 concentration is measured using the STCC4 sensor from Sensirion, temperature and humidity are provided by the SHT40. The display is a 1.54-inch ePaper (eInk) panel with a 27 mm square active area. Three status LEDs (green, yellow, and red) indicate CO2 levels at a glance. The device is powered by a standard 14500 Li-ion battery, rechargeable via USB-C using the BQ24074 from TI, with a regulated 3.3 V supply provided by the TPS63900.
