Product Details
Are you looking to sense CO₂ concentrations up to 100%? The Sensirion STC31 is your go-to sensor! It has two CO₂ measurement ranges: 0 - 25 vol% and 0 - 100 vol%. With a measurement repeatability of 0.2 vol% and a stability of 0.025 vol% / °C, its accuracy depends on the range: 0.5 vol% + 3% measured value or 1 vol% + 3% measured value. Our breakout board comes with a separate SHTC3 humidity and temperature sensor. This allows the STC31 to offer humidity-compensated measurements and better temperature compensation. It can also compensate for atmospheric pressure, useful for mountainous areas. The STC3x sensor family from Sensirion is designed for high-volume applications. Using a revolutionary thermal conductivity measurement principle, it offers excellent repeatability and long - term stability, making it perfect for reliability - critical applications. Based on Sensirion’s patented CMOSens® sensor technology, these sensors combine the sensor element, signal processing, and digital calibration on a small CMOS chip. This proven CMOS technology is great for high - quality mass production and suits demanding and cost - sensitive OEM applications. You can configure the STC31’s I²C address using the split - pad jumpers on the back of the board. The SHTC3’s I²C address is fixed; you'll need a Qwiic Mux to connect multiple sensors to the same bus. Our board includes a power LED, two Qwiic connectors, I²C breakout pads, and pull - up resistors. You can disable the LED and pull - ups by cutting the I2C jumpers on the back. Our Arduino library has example sketches for the Arduino IDE, available through the Arduino Library manager (search for 'SparkFun STC3x') or in the Documents tab. The SparkFun Qwiic Connect System makes prototyping faster and error - free. All Qwiic - enabled boards use a common 1mm pitch, 4 - pin JST connector. Note: This is an experimental SparkX product. It's tested but comes with no guarantees, and live technical support is unavailable. Check our forum for help. Key features include the Sensirion STC31 CO₂ sensor with various capabilities, the SHTC3 humidity and temperature sensor, dual Qwiic connectors, a configurable power LED, and configurable I²C pull - ups. Documents include the STC31 Datasheet, STC Field Calibration Guide, STC Design - In Guide, Schematic, Eagle Files, Arduino Library, and Hardware Repo.
Using the STC31 CO₂ sensor is quite straightforward. First, connect the sensor to your device using the Qwiic connectors on the board. Make sure to check the voltage requirements. The STC31 operates with a supply voltage between 2.7V Min and 5.5V Max, while the Qwiic bus has a max of 3.3V. The SHTC3 humidity and temperature sensor, which helps the STC31 with compensation, needs a supply voltage between 1.62V Min and 3.6V Max. If you want to connect multiple sensors to the same bus, you'll need a Qwiic Mux because the SHTC3's I²C address can't be changed. The STC31's I²C address can be configured using the split - pad jumpers on the back of the board. For getting started quickly, use the Arduino library. You can download it through the Arduino Library manager by searching for 'SparkFun STC3x'. There are example sketches in the library that will help you start working with the sensor right away. When it comes to maintenance, keep the sensor in a clean environment. Avoid exposing it to extreme temperatures outside its specified ranges (-20 °C to +85 °C for the STC31 and -40 °C to +125 °C for the SHTC3). Also, since this is an experimental SparkX product, it has no guarantees, so handle it with care. If you have any questions or need support, head over to the forum.
