SEN66 BLE Gadget

Learn how to set up an Environmental Air Quality Monitor using the SEN66 and an ESP32 development board to measure temperature, humidity, VOC Index, NO_x Index, CO₂, and PM2.5. This tutorial takes you through the entire process, from hardware assembly to software configuration, with real-time data sent via Bluetooth to your phone using the MyAmbience app.

See full tutorial here.
Explore the SEK-SEN66 here. 
Get MyAmbience on the App Store.
Get MyAmbience on Google Play.