Soil Hydrometer

Description: This moisture sensor can be used to detect soil moisture. When the soil is dry, the module outputs a high level, otherwise it outputs a low level. Using this sensor to let you know when it's time to water the plants. The sensitivity can be adjusted (using the potentiometer).

Specifications:

• Runs on 3.3 to 5 volts.
• Has fixed bolt hole, for easy mounting
• Small PCB size: 3.2cm x 1.4cm
• Comparator using LM393 chip
• Two small plates
• VCC external 3.3~5 V
• GND external GND