“This guide has all the information you need to create a very capable, pocket sized sensor.
To get the most out of our DIY air quality sensor, we need it to be:
Pocket-sized
Battery-powered
Have a charging circuit included
Connected to USB
Connected to WiFi and Bluetooth
Readable with an included OLED screen
Under $100
We want our pocket-sized sensor to be able to measure:
Temperature
Pressure
Humidity
CO2 levels
TVOC (air quality) levels”