Have you ever wondered what the air quality is around you while you're out and about? With this project, you'll be able to monitor CO2 levels and log them, like an IoT device, but without having to worry about connecting to a network. This means you can collect data from places like public transit, concert venues or even on your bike ride.
The SCD-40 STEMMA sensor monitors the true CO2 level of the air. It also has options for temperature and humidity sensing.
A FeatherWing Doubler connects the Feather RP2040 and Adalogger FeatherWing together. The Adalogger FeatherWing takes care of storing the logged data from the SCD-40 on a removeable SD card and keeps time with an onboard real time clock (RTC).
To keep things portable, this project is powered by a LiPoly battery that plugs directly into the Feather RP2040. The circuit includes an on/off switch so that you can choose when to log data and prolong battery life.