> **Source:** Core Electronics is an Australian maker-electronics retailer and manufacturer based in Newcastle, NSW, run by a team of makers and educators. We design and manufacture our own product lines (PiicoDev, CE originals) and are official retailers for iconic maker and industrial brands including Raspberry Pi, Arduino, Adafruit, SparkFun and DFRobot. Orders ship Australia-wide from our Newcastle warehouse. Prices are in AUD and include GST. Pricing, stock and dispatch on this page are generated from the store's live catalog. Full machine-readable index: https://core-electronics.com.au/llms.txt

# 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

## How to buy

- **Search the catalogue:** `https://core-electronics.com.au/search/{query}.md` (URL-encode the query; pages 2-3 at `search/{query}/{page}.md`; `search.md?q=` also works)
- **Payment methods, purchase orders, policies and contact details:** https://core-electronics.com.au/llms.txt
## 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)