This is a water sensor /rain alarm circuit diagram; it can be used on motorcycle, car or other device that we want to protect from water, rain. This is a simple water sensor/rain alarm circuit that makes an alarm when water/rain falls on its sensor. This circuit is based on NE555/LM555 IC and two transistors (Q1&Q2). For transistor Q1- BC547 or BC107 and for Q2- 2N825,BC548 or BC168 can be used in the circuit. 

This rain detector circuit can be supplied from voltage source of +9V-12V DC. The resistor 470K ohm is a POT/Variable resistor; it is used to adjust the sensitivity of water/rain sensor. Use a 8 ohm,0.5w-1W speaker to hearing better alarm. Less than 8 ohm speaker could be harmful for the IC 555. 

Circuit Diagram of Water Sensor 

Simple Water Sensor Circuit Diagram using IC 555

 We can make the water sensor as shown in the image (Fig-1) using aluminum conductor like a naked wire . Here can be used other conductor but we suggesting to use aluminum.

Sourced By: Circuitsstream
 
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