SparkFun Humidity and Temperature Sensor Breakout - Si7021

The SparkFun Si7021 Humidity and Temperature Sensor Breakout is a compact, low-cost, digital sensor that delivers highly accurate readings. It's perfect for environmental sensing, data logging, building weather stations, or controlling humidors. The sensor communicates via I²C, providing relative humidity readings and precise temperature measurements.

The sensor's functionality is achieved through just four pins: VCC, GND, and two data lines for I²C communication. The breakout board is equipped with built-in 4.7KΩ pullup resistors for I²C communications, which can be disabled if multiple I²C devices are being used on the same bus. This makes it a flexible component for various projects.

Measuring only 15.24mm x 15.24mm, the SparkFun Si7021 sensor is compact and easy to integrate into your projects. Its small size doesn't compromise its performance, making it a reliable choice for your sensing needs.

For your convenience, SparkFun provides a range of supporting documents. These include a schematic, Eagle files, a datasheet for the Si7021-A20, a hookup guide, and GitHub links for both design files and the library. These resources make it easier to get started and make the most of the sensor's capabilities.