Rain Alarm Circuit using Transistors
Rain Alarm Circuit using Transistors

A downpour caution sensor circuit is exceptionally valuable gadget for alarming when precipitation. The accompanying circuit graph is Rain caution circuit. The graph demonstrates a water identification circuit. It comprises of two NPN transistors. At the point when there is no downpour fall on sensor its obstruction decline and because of that little current stream from + to base.

At the point when current go through sensor to base T1 open and current stream from producer to authority. Cotter of T1 associated with the base of T2 as base of T2 sink current from the producer of T2 it open and bell ring.

water on sensor , transistor T1 is blocked and T2 likewise blocked in light of the fact that base is vacant of the two transistors. At the point when the sensor opposition dips under 4MOhm, T1 leads together with T2 which turns on the piezo signal. The alert is dynamic for around 15-20 seconds until capacitor C1 is released. After the alert, trust that the capacitor will be charged and prepared to utilize once more.

The sensor can be common 2 wires superficially where water may show up. A superior choice is bind the wires to a PCB board masterminded as demonstrated generally on the chart.

Segment Used

Speaker pizo

Transistor BC547

Transistor BC547

Resistor 10k

Capacitor 0.01 mfd

3v to 6v battery

Sensor (Two based on a plastic board to identify water of downpour)

Downpour Alarm Circuit 2

Rain Alarm Circuit

Working of the Circuit:

This downpour caution circuit comprises of two transistor the first one is NPN (BC547 or BC548) and senond 1 is PNP bc 556/bc557 or bc 558). Working of the circuit is basic the transistor BC547B is filling in as a switch in this circuit when the water beads fall on the sensor the transistor will progress toward becoming exchanged on and the 9V will begin going through the transistor which will actuate the Buzzer.

Part Used

Speaker pizo

Transistor BC547

Transistor BC558

Resistor 10k

Resistor 330k

Capacitor 0.01 mfd

3v to 6v battery

Sensor (Two based on a plastic board to distinguish water of downpour)