Quantity   Component name
1 × STM32L476RG Microcontroller
1 × MH-Z19 CO2 sensor Non-dispersive infrared CO2 sensor, 0 - 2,000 ppm
1 × 110-102 CO sensor (SPEC) Ultra low power low cost pre-calibrated CO sensor
1 × SI7021 Compact temperature and humidity sensor
1 × ESP01 ESP8266 through hole wifi module
1 × 1.3inch OLED (B) Waveshare OLED module, through hole
1 × SDS021 Laser particulate matter sensor, pm2.5 and pm10