The main chip of the card is HTU21D. The HTU21D is a low-cost, easy-to-use, highly accurate, digital humidity and temperature sensor. This sensor is ideal for environmental sensing and data logging and is perfect for weather stations or humidity control systems. All you need is two lines for I2C communication and as a bonus you'll have relative humidity readings and very accurate temperature readings!
Connecting this sensor to start using it in a project There are only four pins required. Two data lines, one for VCC, one for GND, and one for I2C communication. This board has internal 4.7k pull-up resistors for I2C communication.
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