Rain Detector schematic

Here's a simple rain detector circuit. It uses a sensor made of a small piece of etched PC board and a simple SCR circuit to detect rain and sound a buzzer. The SCR could also be used to activate a relay, turn on a lamp, or send a signal to a security system.

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Rain Detector Circuit

Rain Detector Using 555 is a simple alarm that can be used to find out when rain was came. Rain Detector Using In principle this is an a stable multivibrator 555 which is prepared by IC555 with a sensor attached that can detect water. A stable multivibrator with the 555 is set in the audio frequency with a frequency of 1 KHz. Rain Detector circuit 555 can be supply with voltage source that is free enough from 5-15 VDC.

Circuit Rain Detector can be mounted on motorcycle, car or other object that we want to protect from rain. Water sensor used in the circuit  Rain Detector Using IC 555.  We can make with a PCB that we make the path as shown in the image above by using aluminum foil  board or insulator boards.

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Simple Rain Alarm

GIVES BEEP WHEN WATER IS IN CONTACT WITH THE WIRE

Water is a conductor of electricity. When water is in contact with the probe then there is a flow of current which reaches to the base of Q1. Transistor Q1 is a NPN transistor which conducts. With the conduction of Q1 electron reaches to Q2 which is a PNP transistor .Q2 also conducts and current flows through the speaker. In a speaker there is inductive coil which causes motion in one direction and also produce induce current which is in opposite direction to the flow of current this induce current in the form of pulse flows through a capacitor, resistance and switches off Q1 and relax .this process repeats again and again till probe is in contact with water or we can say there is a oscillation in the circuit thus speaker diaphragm vibrates and gives a tone. Frequency of the circuit depends on the value of Speaker Coil impendence, Capacitor and Resistance Value.

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