Würth Elektronik has developed a micro-electro-mechanical system (MEMS) sensor only 2 × 2 × 0.9 mm in size. Thanks to its low energy requirement and its calibrated and temperature-compensated digital output, the sensor measures humidity and temperature with long-term stability. The WSEN-HIDS humidity sensor is based on advanced MEMS technology: A dielectric polymer absorbs or releases water molecules in proportion to the relative humidity in the surroundings, thereby changing the permeability of a capacitor structure. The humidity sensor with integrated analog-digital converter and temperature sensor can be connected to commonly used microcontrollers via an I2C or SPI interface. With the help of the software development kit, which is also available, there is no faster/easier way to individually set data rates and use the interrupt pin.
Alongside classical applications, such as heating, ventilation, air conditioning, building automation, and cooling systems, thanks to its small size and minimized energy requirement, the WSEN-HIDS humidity sensor is also suitable for dataloggers, as well as stationary and portable IoT applications. For modern applications, Würth Elektronik provides developers with an evaluation board. The MEMS sensor delivers calibrated measurement results with superb accuracy of ±3.5% RH in the 20% to 80% RH humidity range. The sensor outputs at a data rate in the millisecond range. Condensate forming on the surface of the polymer structure can be removed again by activating a built-in heater – so the sensor can generate measured data again within a very short time. The operating temperature range of the robust sensor is –40 to +120 °C.
- MEMS based capacitive sensing principle
- Relative humidity range 0% to 100%
- Embedded analog to digital converter
- Fully calibrated 16 bit humidity and temperature output
- I²C and SPI communication interface
- Selectable output data rate up to 12.5 Hz
- Operating temperature range: -40 °C to 120 °C
- Sensor Software Development Kit
- Sensor SDK User Manual