Simple Soil Moisture Sensor Circuit

The video tutorial explains a simple circuit with an LED that indicates soil moisture levels. The LED remains on when there is no conductivity between two probes, such as in dry soil, and turns off when the probes are in wet soil. This circuit can also function as a water level indicator, turning the LED off when water is present and on when the water level drops. It serves as a practical tool for determining when to water plants.

What happens to the LED when the probes are placed in dry soil?

• The LED stays on.

• The LED blinks.

• The LED turns off.

• The LED changes color.

How does the LED respond when the probes are in wet soil?

• The LED stays on.

• The LED dims.

• The LED turns off.

• The LED blinks rapidly.

What is the function of the circuit when used as a water level indicator?

• It changes the water temperature.

• It indicates when the water level is low.

• It alerts when the soil is too dry.

• It measures soil pH.

When does the LED turn on in the water level indicator mode?

• When the water level is high.

• When the water level drops.

• When the soil is wet.

• When the probes are disconnected.

What can this circuit help you determine about your plants?

• When to water them.

• When to harvest them.

• When to prune them.

• When to fertilize them.