Temp-Hum 11 Click is a temperature and humidity sensing Click board™, equipped with the HDC1080, a high accuracy digital humidity, and temperature sensor. Its key features are its low power consumption, and the measurement accuracy achieved with that much energy. The HDC1080 sensor can sense the relative humidity (RH) with the accuracy of ±2%, while the temperature can be sensed with the accuracy up to ±0.2⁰C. It has a 14-bit measurement resolution, and it can be operated over a wide supply voltage range, allowing it to be interfaced with both 5V and 3.3V MCUs with no additional components required.
Temp-Hum 11 Click is supported by a mikroSDK compliant library, which includes functions that simplify software development.
Built with the power consumption in mind, the HDC1080 is an ideal solution for IoT development. A common problem for all humidity sensors is the memory effect or a hysteresis after prolonged exposure to extreme RH values for prolonged periods of time. Therefore, the HDC1080 is equipped with the heating element, reducing this offset and preventing condensation to be formed on the surface of the sensor. Low power consumption and high accuracy make the HDC1080 a perfect solution for various IoT RH and temperature measuring applications, smart homes, HVAC systems, air conditioner remote controllers, etc.
The sensor IC used on the Temp-Hum 11 Click is the HDC1080, a low power humidity and temperature digital sensor from Texas Instruments. This sensor is factory calibrated to ±2% relative humidity and ±0.2°C temperature accuracy. It has an integrated heating element that is used to evaporate condensation, protecting the sensor that way. This heating element can be simply activated by setting a bit in the appropriate register. In the case when the heater is powered on, the typical current consumption is about 90mA.
Internally, two sensors are connected to the 14-bit ADC section, which can be set to sample measurements with the resolution of 8, 11 or 14 bits, based on the measurement (integration) time. The OTP memory holds the calibration coefficients that are applied to the measured value and the results are stored on the output registers, in the MSB/LSB format. These values are then used in formulas found in the HDC1080 datasheet so that the final temperature or relative humidity data can be calculated.
HDC1080 IC is a very low power consuming device and it can work in two modes: sleep and active (measurement) mode. The device enters the sleep the mode as soon as possible, in order to save power. This makes the HDC1080 suitable to be used for battery-powered applications. In these applications, the HDC1080 can spend most of the time in the sleep mode that has a typical current consumption in the magnitude of nanoamperes. The measurement is triggered after the command is sent over the I2C interface. As soon as the single measurement is finished, the device falls back to a sleep mode. The host should wait for the acquisition to be completed before reading the output registers. However, the Click board™ is supported by a library of mikroSDK compatible functions, which simplify the development.
The heating element can be used to reduce the offset which is a common problem for most RH sensors. It also helps with the condensation, evaporating the excess moisture. The current consumption is increased when the heater is on. It can be enabled by configuring the appropriate register, but it won't be actually activated until a measurement is triggered. Therefore, to increase its temperature, measurement frequency should be increased.
The Click board™ can be interfaced with both 3.3V and 5V MCUs without the need for any external components. Thanks to the HDC1080 and its support for a wide supply voltage range, the Click board™ can be simply used with any MCU that supports I2C communication.
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