Starter Guide

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Lesson 22 CM+Soil Moisture sensor
Introduction
In this lesson, let’s learn about the use of the soil moisture sensor.
What is Soil Moisture sensor?
The Soil Moisture Sensor module is a simple sensor that measures the soil
moisture. When the soil moisture is insufficient, the output value of the
sensor will decrease; on the other hand, the value will increase when there’s
enough water. The surface of the sensor is gilded to prolong its life.
The CM Module consists of a comparator LM393 and extremely simple
external circuits. When using the module, you can set a threshold via the
blue potentiometer beforehand. When the input analog value reaches the
threshold, the digital pin S will output a Low level.
Soil moisture sensor Module
1
Analog output
2
Analog output
CM Module
1
Analog output
2
Analog output
S
Digital output
A
Analog output