This is a simple arduino project for a soil moisture sensor that will light up a LED at a certain moisture ... in the dry soil and measure the resistance value and then pour water and measure it again ...

The soil moisture sensor module , built around the LM393 ... to one analog input (A0) of the Arduino. Here is the test code that indicates the soil wet/dry conditions using just two LEDs (green & red) ...

Ever wanted to measure soil moisture? Common “soil moisture meter module arduino ... using nail polish, and ending with the current option – a rotisserie-like device that rotates sensors ...