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SCD-40 - True CO2, Temperature and Humidity Sensor - STEMMA QT / Qwiic

SKU 4150
Save 23%
Original Price £65.99 inc VAT
Current Price £50.78 inc VAT
£42.32 ex VAT
4 in stock.

The SCD-40 is a photoacoustic 'true' CO2 sensor that will tell you the CO2 PPM (parts-per-million) composition of ambient air, unlike other sensors like the SGP30, this sensor isn't approximating it from the VOC gas concentration - it really is measuring the CO2 concentration! 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. 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.

Getting started with this sensor is quick and easy. It has been soldered onto a custom PCB with both STEMMA QT and Qwiic connectors allowing you to plug it straight into your next project, or chain it with other sensors and accessories without having to solder anything yourself. 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, Adafruit has 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. Advanced hackers, can cut/solder the backtraces to change whether the regulator is enabled and what I2C logic level is desired.

  • Photoacoustic CO2 sensor technology
  • Integrated temperature and humidity sensor
  • Measurement range: 400 ppm – 2000 ppm
  • Accuracy: ±(50 ppm + 5 % of reading)
  • Current consumption: 17 mA (meas. rate = 5 s) / 0.5 mA (meas. rate = 5 min)
  • Fully calibrated and linearized
  • I2C digital interface address 0x61
  • Sensor Element Size: 10.1mm x 10.1mm x 6.5 mm
  • Dimensions: 25.5mm x 22.8mm x 7.7mm / 1.0" x 0.9" x 0.3"
  • Weight: 2.8g / 0.1oz