You can easily use the Arduino soil moisture sensor, which operates with a supply voltage of 3.3 - 5V, in your projects. It can detect the moisture content in the soil; for example, by making a simple circuit, you can automatically give the water needed for your plants without you being at the beginning.

Soil Moisture Sensor Specifications:

• Sensitivity adjustment with potentiometer (the blue one)
• Working voltage: 5V
• Two separate outputs: Digital and analog (more sensitive)
• Fixing hole for easy installation
• Small PCB size: 3cm x 1.5cm
• Power indicator (red) and switched output indicator (green)
• Stable LM393 comparator

Package contents:

• 1 sensor to contact the ground,
• 1pcs sensor circuit,
• 1pc set cable.