Product Review

Description:
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 perfect for a weather stations or humidor control systems. All you need is two lines for I2C communication and you'll have relative humidity readings and very accurate temperature readings as a bonus!
There are only four pins that need to be hooked up in order to start using this sensor in a project. One for VCC, one for GND, and two data lines for I2C communication. This breakout board has built in 4.7k pull up resistors for I2C communications. If you're hooking up multiple I2C devices on the same bus, you may want to disable these resistors.

Specification：
Supply voltage: 1.5V-3.6
Humidity measuring range: 0-100% RH
Temperature measuring range: -40 ℃-105℃
Maximum power consumption: 2.7uW
Communication: I2C
Humidity accuracy range (10% RH to 95% RH): HTU21D ± 2% RH
Humidity Hysteresis: ± 1% RH
Measurement time: 50ms
In drift: -0.5% RH / year
Response time: 5 s

Package Inlcuded:
1*HTU21D Temperature Humidity Sensor Breakout Module