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RAIN ALARM CIRCUIT Use TRANSISTOR

A downpour caution sensor circuit is extremely useful gadget for alarming when precipitation. The accompanying circuit outline is Rain caution circuit. The chart shows a water location circuit. It comprises of two NPN transistors. 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 gatherer. Cotter of T1 associated with the base of T2 as base of T2 sink current from the producer of T2 it open and ringer ring.

water on sensor , transistor T1 is blocked and T2 additionally blocked on the grounds that base is unfilled of the two transistors. At the point when the sensor obstruction dips under 4MOhm, T1 directs together with T2 which turns on the piezo ringer. The caution is dynamic for around 15-20 seconds until capacitor C1 is released. After the caution, trust that the capacitor will be charged and prepared to utilize once more.

The sensor can be standard 2 wires superficially where water may show up. A superior choice is bind the wires to a PCB board orchestrated as indicated 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 recognize water of downpour)

Downpour Alarm Circuit 2



Downpour Alarm circuit




Working of the Circuit:


This downpour alert 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 become turned on and the 9V will begin going through the transistor which will enact 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 identify water of downpour)

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