Today at Electronics we learnt that when the plants are thirsty they cannot speak to us be we can use electronics to communicate with them. I learnt that which substances have more moisture in them. If there was moisture in the LED it would light up. This is a breadboard model of the sensor. The circuit diagram I drew on Circuit Lab app.
A Water Indicator
How does it work?
In this circuit the transistor is acting as a switch.
In dry soil, the resistance between the probes very high & the transistor receives little or no base current and it cannot turn on.
In moist soil, the resistance is much lower, and the transistor receives enough base current to enable it to turn on, lighting the LED.
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