Environment 2 Click is a compact add-on board containing best-in-class SHT humidity and SGP air-quality sensing solutions from Sensirion. This board features SHT40 and SGP40, a high-accuracy ultra-low-power relative humidity, and a temperature sensor combined with MOx based gas sensor. The SHT40 sensor offers linearized digital output, provides constant temperature accuracy, up to 0.1°C, and shows the best performance when operated within the temperature and humidity range of 5-60°C and 20-80%RH, while the SGP40, a digital gas sensor, features a temperature-controlled micro hot-plate providing a humidity-compensated VOC-based indoor air quality signal. This Click board™ is suitable for indoor air quality and various temperature and humidity-related applications.

Environment 2 Click is supported by a mikroSDK compliant library, which includes functions that simplify software development.

Environment 2 Click as its foundation uses the SHT40 and SGP40, a high-accuracy best-in-class SHT relative humidity, and a temperature sensor combined with MOx based gas sensor from Sensirion. The SHT40 offers reduced power consumption, improved accuracy specifications, and a fully calibrated digital I2C Fast Mode Plus interface for the fastest data transfer. It covers extended operating humidity and temperature ranges from 0 to 100%RH and from -40°C to 125°C with accuracies of ±1.8%RH and ±0.2°C. On the other side, an additional gas sensor of this combo solution, the SGP40, provides a humidity-compensated VOC-based indoor air quality signal in addition to a temperature-controlled micro hot-plate.

The SHT40 shows the best performance when operated within the recommended average temperature and humidity range of 5-60°C and 20-80%RH. Long-term exposure to conditions outside recommended normal range, especially at high relative humidity, may temporarily offset the RH signal. After returning to the recommended average temperature and humidity range, the sensor will recover to within specifications by itself.

The output signal of the SGP40 is processed by Sensirion’s VOC Algorithm, which automatically adapts to the environment the sensor is exposed to translate the raw signal into a VOC Index. Sensing element and VOC Algorithm feature unmatched robustness against contaminating gases present in real-world applications enabling exceptional long-term stability and low drift, high reproducibility, and reliability.

Environment 2 Click communicates with MCU using the standard I2C 2-Wire interface. Since both sensors for operation requires a 3.3V logic voltage level only, this Click board™ also features the PCA9306 voltage-level translator from Texas Instruments. The I2C interface bus lines are routed to the dual bidirectional voltage-level translator, allowing this Click board™ to work with both 3.3V and 5V MCUs properly.

This Click board™ can operate with both 3.3V and 5V logic voltage levels selected via the VIO SEL jumper. This way, it is allowed for both 3.3V and 5V capable MCUs to properly use the I2C communication lines. However, the Click board™ comes equipped with a library containing easy-to-use functions and an example code that can be used, as a reference, for further development.

• Interface: I²C
• Compatibility: mikroBUS™
• Dimensions: 42.9 x 25.4mm
• Input Voltage: 3.3V or 5V
• SHT40 Temperature Accuracy: ±0.2°C
• SHT40 Relative Humidity Accuracy: ±1.8%RH
• SHT40 Operating Humidity Range: Min. 0%RH, Max. 100%RH
• SGP40 Measurement Range: Min. 0ppm, Max. 1000ppm
• SGP40 Operating Humidity Range: Min. 0%RH, Max. 90%RH
• Operating Temperature Range: Min. -10°C, Typ. +25°C, Max. +50°C

• Schematic
• SGP40 Datasheet
• SHT40 Datasheet
• PCA9306 Datasheet
• mikroSDK
• GitHub