SHT4X: High Accuracy Digital I2C Humidity Sensor

Description

This sample application periodically reads the ambient temperature and humidity from an SHT4X device. The result is written to the console.

The SHT4X sensor has an optional heater that can be useful for specific environments or applications (refer to the datasheet for more information). To utilize the heater, check the Kconfig options for this application.

References

• SHT4X sensor

Wiring

This sample uses the SHT4X sensor controlled via the I2C interface. Connect Supply: VDD, GND and Interface: SDA, SCL. The supply voltage can be in the 1.7V to 3.6V range. Depending on the baseboard used, the SDA and SCL lines may require Pull-Up resistors.

Building and Running

This project outputs sensor data to the console. It requires an SHT4X sensor. It should work with any platform featuring an I2C peripheral interface. This example includes a device tree overlay for the Black Pill V2.0 board.

# From the root of the zephyr repository
west build -b blackpill_f411ce samples/sensor/sht4x
west flash

Sample Output

*** Booting Zephyr OS build v2.6.0-rc1-315-g50d8d1187138  ***
SHT4X: 23.64 Temp. [C] ; 30.74 RH [%]
SHT4X: 23.66 Temp. [C] ; 32.16 RH [%]
SHT4X: 23.63 Temp. [C] ; 30.83 RH [%]

The datasheet states that the sensor measures temperature and humidity in degrees Celsius and percent relative humidity respectively.