Humidity Sensor – SI7020

O Watch Sensor Kit includes a sensor board with a humidity sensor named SI7020 that provide the value for relative humidity. This sensor also measures the temperature (so you have two temperature sensors in the O Watch!).

But before we start, find out more about humidity and relative humidity.


To use this sensor we will use the SI7020 library written by Marcus Sorensen. Click here to download the zipped library. Unzip and move the unzipped folder in to your ‘Arduino->libraries’ folder.

The code below shows you how to use this sensor library to read humidity and temperature values.

Blow in to the O Watch like you would fog a window to see the humidity value change.

Now you can measure the humidity levels inside your home anytime!

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