SparkFun Humidity and Temperature Sensor Breakout – Si7021

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 weather stations or humidor control systems. 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.

Specifications

• Dimensions: 0.6′ x 0.6′

• Schematic
• Eagle Files
• Datasheet (Si7021-A20)
• Hookup Guide
• GitHub (Design Files & Example Code)
• GitHub (Library)