The schematic shown here is a circuit of plant watering watcher or dry soil detector. The plants located in your home or office wants more care as compare to the plants outside. We often forget to water the plants in our home and offices due to load of work and as a result our plants become
dry and unhealthy. The circuit shown here is a very useful device for reminding to water your plant. The circuit will give a beep and activate an LED when the two probes will not detect any moisture in the soil. The 300K variable resistor is used to activate the buzzer and LED on the desired level of soil dryness.
To adjust the circuit, insert the two probes when the soil is moist and slightly adjust the variable resistor until the LED and buzzer goes off, after that take out one probe from the soil, if the LED and the buzzer will activate that means your circuit is adjusted and ready for use.