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Product description: SCD-40 - Temperature, humidity and carbon dioxide sensor - I2C - STEMMA QT / Qwiic - Adafruit 5187
High precision sensor designed to measure temperature, humidity and carbon dioxide CO2 concentration. Manufactured by Adafruit company. Measurement range is from 400 ppm to 2000 ppm, with measurement accuracy ± 50 ppm + 5%. Module is equipped with STEMMA QT / Qwiic connectors, which improve connection of the sensor with main module, e.g. Arduino or Metro board. SCD-40 is powered from 3.3V to 5V. It uses I2C digital communication interface, with address 0x61. The sensor can be used for both indoor and outdoor applications.
Product compatible with Arduino and Raspberry Pi
A user guide is available on the manufacturer's website, which makes it significantly easier to get started with the sensor. It contains, among others, wiring diagram and sample program codes.
Connection diagram of sensor with Metro board using STEMMA QT / Qwiic connector.
SCD-40 Sensor connection
Sensor connection is done with goldpin connectors (included in set) or STEMMA QT / Qwiic connectors. Example connections are presented using Metro board, which is equivalent to Arduino.
Pinout description of Adafruit 5187
- VIN - power supply pin, voltage from 3,3 V to 5 V
- 3Vo - power supply pin, voltage 3,3 V
- GND - chip ground pin
- SCL - I2C bus clock line pin
- SDA - I2C bus data line pin
Technical specifications of the sensor from Adafruit
- Circuit: SCD-40
- Photoacoustic CO2 sensor technology
- Measuring range: from 400 ppm to 2000 ppm
- Measurement precision: ± 50 ppm + 5%
- Current consumption: 17 mA
- Communication interface: I2C
- Communication interface address: 0x61
- Fully calibrated and linearized
- Connectors: STEMMA QT / Qwiic
- Compatible with Arduino and Raspberry Pi
- Dimensions: 25.5 x 22.8 x 7.7 mm
Sensor module from Adafruit.
