SHT11 Sensors, Transducers

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Humidity and moisture sensors are essential components of many microcontroller (MCU) and Internet of Things (IoT) applications. The Sensirion SHT11 is a first-generation relative humidity and temperature sensor developed by Sensirion. This article provides an overview of several application fields and a description of the working principle of the SHT11.

The SHT11 is generally used in applications that require reliable humidity and temperature measurements. Its wide range of applications include an automatic weather station, time-controlled humidifiers, temperature control in computer rooms, air conditioning systems, and climate research. The SHT11 is also used in many industrial applications such as grain storage control, surface manufacturing, pharmaceutical processes, and storage facilities.

The SHT11 is capable of accurately and reliably measuring relative humidity in the range of 5–95% RH and temperature in the range of –40°C to +130°C. It also has excellent long-term stability, with a maximum error of ±3% RH and ± 0.2°C over a 5-year period. This makes the SHT11 ideal for applications that require precise, reliable, long-term measurements.

The working principle of the SHT11 is based on the humidity-dependent resistance of a thin-film measurement diaphragm. The measurement diaphragm is protected by an integrated filter cap that prevents dust and dirt from entering the sensor and affecting the measurements. The sensor measures the humidity-dependent electrical resistance between the two electrodes on the measurement diaphragm. The SHT11 uses a digital output signal containing an 8-bit data word to communicate the measured resistance value. This data word is then converted into the relative humidity and temperature measurements.

Other features of the SHT11 include a low power consumption of approximately 0.4V, a fast response time of less than 1 second, and a compact 6-pin housing. The integrated EEPROM also allows the SHT11 to store calibration data which can be used to improve accuracy and eliminate the need to recalibrate the sensor after power failure. The SHT11 is also resistant to mechanical stress and immune to electromagnetic interference.

Overall, the SHT11 is a reliable and accurate sensor that can be used in a wide range of applications requiring precise, long-term measurements. Its features including low power consumption, fast response time, and EEPROM storage make it a great choice for a variety of applications.

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