MIKROE Temp&Hum 2 Click

Temp&Hum 2 Click is a smart temperature and humidity sensor Click board™ packed with features that allow easy and simple integration into any design that requires accurate and reliable humidity and temperature measurements. It measures a wide range of temperature and relative humidity values with a great accuracy. The Si7034 sensor IC from Silicon labs used on this Click board™ utilizes the patented industry-standard low-K polymeric dielectrics for humidity sensing. It allows low drift and power consumption low hysteresis and excellent long-term stability. The Si7034 IC also includes a thermal sensor and all the sensor and thermal calibration data is stored on-chip allowing interchangeability between the different samples of the IC with no additional calibration steps. These features make Temp-Hum 2 Click a perfect solution for a wide range of applications that depend on accurate temperature and humidity readings. It is a perfect choice for various consumer and industry related applications such as the indoor weather stations thermostats and humidistats microenvironment centers respiratory therapy applications and similar. The sensor IC used on the Temp&Hum 2 Click is the Si7034 a digital humidity and temperature sensor IC with I2C interface from Silicon Labs. It is a digital relative humidity and a temperature sensor that integrates temperature and humidity sensor elements an analog-to-digital converter signal processing calibration and data correction on the chip. Each chip is factory calibrated and the calibration data is stored in its non-volatile memory. The maximum accuracy achieved with this sensor is ± 4% RH for the humidity range from 0 to 80%. Besides the humidity sensing element this sensor includes an accurate thermal sensor which can achieve up to ±0.4 °C. It is used in conjunction with the humidity measurement to allow thermal compensation of the relative humidity measurements. This sensor IC also has an integrated heating element that is used to evaporate condensation reducing the effect of the offset accumulation when used in high humidity conditions or to implement dew-point measurement when the Si7034 is used with a separate temperature sensor. The heating element current can be adjusted by the appropriate bits in the Humidity Control Register. Due to the nature of the used sensors a special care should be taken to reduce the sensor contamination to a minimum. Particles dirt or other artifacts collected on the surface of the exposed polymer film will affect its ability to measure the humidity and therefore the manufacturer recommends protecting the sensor against particles. The sensor otherwise has a long aging period with minimal drift. Synthetic long-term stability tests show less than 0.25 %RH per year drift. The data provided by the IC is ready to be used directly. Two measurements are done when a command is received via the I2C. One is the humidity measurement while the second is temperature measurement used for the compensation. By applying this simple formula the relative humidity can be directly represented in percentages: ->