Day 15 Arduino Advent Calendar

First published at Friday, December 15 2017

 class= Let's Get Started with the Day 15 Guide!

Arduino Advent Calendar Day 15 - Soil Moisture Sensor!

As I write this guide, it's 41ºC at LittleBird HQ and cross Australia today, many plants will die a needless death from dehydration, but thanks to today's guide, yours need not! 

Today we're looking at the Moisture Sensor! 

What is a Soil Moisture Sensor? 

Soil moisture sensors measure the volumetric water content in the soil. 
The two large exposed pads function as probes for the sensor, together acting as a variable resistor.
The more water (and salt) in the soil, the lower the resistance.
We're able to measure this change in resistance as a change in voltage.

Yup, enough talking about it let's go and build up the circuit over at !

  Let's Get Started with the Day 15 Guide!

We're happy to help!

If you find you're getting stuck with today's guide, hit up our team of highly trained Arduino ninjas on this forum thread.

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