SparkFun Humidity and Temperature Sensor Breakout - Si7021
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The Si7021 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 building a weather stations or humidor control system. All you need are 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 4.7KΩ pullup resistors for I2C communications. If you're hooking up multiple I2C devices on the same bus, you may want to disable these resistors.
**Features:**
* 0.6\" x 0.6\"
**Documents:**
* [Schematic](https://cdn.sparkfun.com/datasheets/Sensors/Weather/SparkFun_Si7021_Breakout.pdf)
* [Eagle Files](https://cdn.sparkfun.com/datasheets/Sensors/Weather/Si7021.zip)
* [Datasheet](https://cdn.sparkfun.com/assets/b/1/b/8/5/Si7021-A20.pdf) (Si7021-A20)
* [Hookup Guide](https://learn.sparkfun.com/tutorials/si7021-humidity-and-temperature-sensor-hookup-guide)
* [GitHub](https://github.com/sparkfun/Si7021_Breakout) (Design Files)
* [GitHub](https://github.com/sparkfun/SparkFun_Si7021_Arduino_Library) (Library)