Si7021 Humidity and Temperature Sensor Hookup Guide

Contributors:

Joel_E_B

Introduction

The Si7021 is a low-cost, easy to use, highly accurate, digital temperature and humidity sensor. All you need is two lines for I²C communication, and you’ll have relative humidity readings and accurate temperature readings as well! This sensor is ideal for environmental sensing and data logging, perfect for a weather station or humidor control system.

SparkFun Humidity and Temperature Sensor Breakout - Si7021

SEN-13763

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The Si7021 also comes equipped with a hydrophobic PTFE filter covering the inlet on the sensor. This filter blocks contaminants but allows water vapor to pass through, keeping your sensor safe from water damage while still proving accurate sensor readings.

Required Materials

To follow along with this hookup guide, you will need the following:

Pull-up Resistors

A quick introduction to pull-up resistors - whey they're important, and how/when to use them.

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Installing an Arduino Library

How do I install a custom Arduino library? It's easy! This tutorial will go over how to install an Arduino library using the Arduino Library Manager. For libraries not linked with the Arduino IDE, we will also go over manually installing an Arduino library.

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