# SparkFun Humidity and Temperature Sensor Breakout - Si7021

**Type:** Product page · **SKU:** SEN-13763 · **Brand:** [Sparkfun](https://core-electronics.com.au/brands/sparkfun-australia)
**Page:** https://core-electronics.com.au/sparkfun-humidity-and-temperature-sensor-breakout-si7021.html ([markdown](https://core-electronics.com.au/sparkfun-humidity-and-temperature-sensor-breakout-si7021.html.md))

## Retired product

This product is retired and no longer available for purchase. Replaced by: SEN-16467.

**Replacement:** https://core-electronics.com.au/catalog/product/view/sku/SEN-16467

## Description

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 build 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.

Note: Full drops of water can damage the sensor. Sparkfun recommend wrapping the board in Teflon/irrigation tape for extreme conditions where water droplets may find their way onto the sensor.

Dimensions: 0.6" x 0.6"

Documents:

- [Schematic](https://core-electronics.com.au/attachments/localcontent/SparkFun_Si7021_Breakout_8396253b032.pdf)
- [Eagle Files](https://core-electronics.com.au/attachments/localcontent/Si7021_1069737942d.zip)
- [Datasheet](https://core-electronics.com.au/attachments/localcontent/Si7021_361589d5bf0.pdf) (Si7021)
- [Hookup Guide](https://learn.sparkfun.com/tutorials/si7021-humidity-and-temperature-sensor-hookup-guide)
- [GitHub](https://github.com/sparkfun/Si7021_Breakout) (Design Files & Example Code)
- [GitHub](https://github.com/sparkfun/Si7021_Breakout/tree/master/Libraries) (Library)

## Images

- [Product image 1](https://core-electronics.com.au/media/catalog/product/s/e/sen-13763.jpg)