SparkFun CO₂ Humidity and Temperature Sensor - SCD40 (Qwiic)

This SparkFun CO2 Humidity and Temperature Sensor features the next-generation SCD40 photoacoustic CO2 sensor for high-accuracy environmental readings. The SCD40 uses Sensirion's PASens® photoacoustic measurement system that combines narrow-band IR light and a microphone inside the sensing package capable of detecting concentrations from 0 to 40000 ppm with high accuracy over 400-2000 ppm ±(50 ppm+5%). The SCD40 has an integrated temperature and humidity CMos® sensor to improve accuracy. For additional accuracy, the SCD40 also accepts ambient pressure readings! All this functionality comes in our standard 1in. x 1in. Qwiic form factor and will seamlessly integrate into your Qwiic-based projects. However, we still routed the I2C signals out to a set of 0.1in.-spaced pins for users who prefer a soldered connection. The SCD40 includes an automatic self-calibration routine to automatically adjust to its sensing environment over a seven-day calibration period. For best results, Sensirion recommends taking continuous readings for at least one hour a day of 'fresh air' for the calibration period to complete. We've written an Arduino library to make reading the CO₂, humidity, and temperature very easy. It can be downloaded through the Arduino Library manager: search for 'SparkFun SCD4x', or it can be found in the Documents tab below. Get started with the Sparkfun SCD4X CO2 hookup guide

Features

* I2C Interface (Qwiic-enabled)

* I2C Address: 0x62

* 2x Qwiic Connectors

* Supply Voltage Range: 2.4-5.5V (3.3V Typ.)

* Low Current Consumption:

* Normal Mode:

* Max: 205mA@3.3V

* Typ: 18mA@3.3V

* Low Power Mode:

* Typ: 3.5mA@3.3V

* Single-Shot:

* 0.5mA@3.3V

* Photoacoustic Measurement System

* Sensirion's PASens Technology

* Integrated Temperature and Humidity Sensor

* Sensirion's CMOSens Technology

* CO2 Output Range: 0-40,000ppm

* CO2 Measurement Accuracy: ±(50ppm + 5% of reading)

* Conditions: 400-2,000ppm

* Humidity Range: 0-100%RH

* Humidity Accuracy: ±9%RH (Full Range)

* Temperature Range: -10°C-60°C

* Temperature Accuracy: ±1.5 (Full Range)

Resources

* Schematic

* Eagle Files

* Board Dimensions

* Hookup Guide

* Datasheet (SCD4X)

* Qwiic Information Page

* SCD4X Arduino Library

* Github Hardware Repo