#LilyGo Air Quality Project

Monitor air quality, CO2, temperature, and humidity, displayed on a 1.9" display.

This is a very simple project to make a ~$100 standalone air quality monitor.

The components all connect together with Qwiic cables, with USB-C power, so there is no soldering needed, just plug-and-play. The Arduino IDE is used to build and upload code.

#Hardware

(approx prices in 2024)

• Lilygo T-Display-S3 ESP32 w/ grey shell ($18)
• SCD41 CO2 sensor ($65)
• ENS160 Air Quality sensor ($20)
• 2x Qwiic cables ($2)
• USB-C (for power)

#Software Libraries

#LilyGo T-Display-S3

The TFT_eSPI library is used to drive graphics. I imported the code from commit 13e743f5.

#SparkFun SCD41

• SparkFun CO₂ Humidity and Temperature Sensor - SCD41 (Qwiic)
• SCD4x Arduino Library

Version 1.1.0 of the SCD4x software from Sparkfun crashed. 1.0.4 was used.

#SparkFun ENS160

• SparkFun Indoor Air Quality Sensor - ENS160 (Qwiic)
• ENS160 Arduino Library

Version 1.0.4 was used.

#Deploying Code

The "LilyGo T-Display-S3" target is used in the Arduino IDE.