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.

Prerequisite Guides


Angled shot of black rectangular microcontroller "Feather RP2040"
A new chip means a new Feather, and the Raspberry Pi RP2040 is no exception. When we saw this chip we thought "this chip is going to be awesome when we give it the Feather...
In Stock
Adalogger FeatherWing with Real time clock and SD card slot.
A Feather board without ambition is a Feather board without FeatherWings! This is the Adalogger FeatherWing: it adds both a battery-backed Real Time Clock and micro SD...
Out of Stock
Double prototyping feather wing PCB with socket headers installed
This is the FeatherWing Doubler - a prototyping add-on and more for all Feather boards. This is similar to our
In Stock
Angled shot of Adafruit SCD-40 - NDIR CO2 Temperature and Humidity Sensor.
Take a deep breath in...now slowly breathe out. Mmm isn't it wonderful? All that air around us, which we bring into our lungs, extracts oxygen from and then breathes out carbon...
Out of Stock
Angled shot of STEMMA QT / Qwiic JST SH 4-pin Cable.
This 4-wire cable is a little over 100mm / 4" long and fitted with JST-SH female 4-pin connectors on both ends. Compared with the chunkier JST-PH these are 1mm pitch instead of...
In Stock
Angled shot of CR1220 12mm Diameter - 3V Lithium Coin Cell Battery - CR1220.
These are the highest quality & capacity batteries, the same as shipped with the iCufflinks, iNecklace, Datalogging and GPS Shields, GPS HAT, etc. One battery per order...
In Stock
Breadboard-friendly SPDT Slide Switch
These nice switches are perfect for use with breadboard and perfboard projects. They have 0.1" spacing and snap in nicely into a solderless breadboard. They're easy to switch...
In Stock

This guide was first published on Oct 27, 2021. It was last updated on Apr 15, 2024.

This page (Overview) was last updated on Mar 08, 2024.

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