Soil Moisture Sensor - MH-Sensor Series, Flying-Fish

The Soil Moisture Sensor from MH-Sensor Series, Flying-Fish, provides both a Digital (High or Low) and an Analogue output.

The module has four pins

•     VCC: For power (2V to 36V)
•     A0: Analog output
•     D0: Digital output
•     GND: Ground

The module also contains a potentiometer which will set the threshold value and then this threshold value will be compared by the LM393 comparator. The output LED will light up and down according to this threshold value.

Soil Humidity Sensor (MH-Sensor Series Flying-Fish)

 Connected to a 5V supply the analogue output measured as follows

• In air - 5V
• Wet soil - 2V
• Water - 1.9V