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Water Sensor Circuit Diagram using IC 555

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

Fig-1: Water Sensor/Rain alarm circuit diagram

Water sensor PCB layout:

Fig-2: PCB layout of water sensor
We can make the water sensor as shown in the image (Fig-2) using aluminum conductor like a naked wire . Here can be used other conductor but we suggesting to use aluminum.
Water Sensor Circuit Diagram using IC 555 Water Sensor Circuit Diagram using IC 555 Reviewed by Shuvojit Das on 11:57 PM Rating: 5

3 comments:

  1. Can a relay be used in place of the speaker and, if so, what voltage?
    I had trouble finding a 0.01uF polarized capacitor so tried replacing it with a non-porarized capacitor. Dunno if that's the problem, but, so far, it hasn't worked.

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  2. Of course you can but with a required interface for relay.
    also there is not a big problem with non-polarized capacitor(0.01uF), you can use it. all the best...

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  3. Nice Circuit.....
    Thanks buddy......

    visit my electronics blog:-

    MYCIRCUITS9

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