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Adafruit SCD-43 - True CO2 Temperature and Humidity Sensor - STEMMA QT / Qwiic
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 dioxide. CO2 is essential for life on this planet we call Earth - we and plants take turns using and emitting CO2 in an elegant symbiosis. But it's important to keep that CO2 balanced - you don't want too much around, not good for humans and not good for our planet.
The SCD-43 is a photoacoustic 'true' CO2 sensor that will tell you the CO2 PPM (parts-per-million) composition of ambient air. Unlike the SGP30, this sensor isn't approximating it from VOC gas concentration - it really is measuring the CO2 concentration with a specified range of 400~5000 ppm with an accuracy of ±(30 ppm + 3% of reading). It also supports single-shot measurements and is designed to meet stringent indoor air quality standards.That means it's bigger and more expensive, but it is the real thing. Perfect for environmental sensing, scientific experiments, air quality and ventilation studies, and more.
Compared to the illustrious SCD-30, this sensor uses a different measurement technique, which allows it to be much smaller. The overall data quality should be very similar, however. Like the SCD-30, this sensor has data read over I2C, so it works very nicely with just about any microcontroller or microcomputer. There's both Arduino and Python/CircuitPython code so you can get started in a jiffy.
This sensor can run from 3.3 to 5V but it's more important for it to have a quiet power supply with low ripple, than any particular voltage. For that reason, we've added a 3.3V regulator and level shifters: when connecting to a 5V microcontroller like an Arduino UNO the 5V supply is often shared with other electronic components that add noise. The onboard regulator will keep the voltage nice and quiet. For advanced hackers, they can cut/solder the backtraces to change whether the regulator is enabled and what I2C logic level is desired.
User Manual / Datasheet / Example Codes Etc.
Specifications
- Photoacoustic CO2 sensor technology
- Integrated temperature and humidity sensor
- Measurement range: 400 ppm – 5000 ppm
- Accuracy: ±(30 ppm + 3.0 % of reading)
- Response Time: 60s
- Current consumption: 17 mA (meas. rate = 5 s) / 0.5 mA (meas. rate = 5 min)
- Fully calibrated and linearized
- I2C digital interface address 0x62
- Sensor Element Size: 10.1mm x 10.1mm x 6.5 mm
- Product Dimensions: 25.5mm x 22.8mm x 8.0mm / 1.0" x 0.9" x 0.3"
- Product Weight: 2.7g / 0.1oz
Package Includes
- 1x Adafruit SCD-43 - True CO2 Temperature and Humidity Sensor - STEMMA QT / Qwiic
