Water Sensor or Alarm Using 2N2222 Transistors

About: just a hobbyist

Who doesnt hate it when it rains while some stuff are outside?(and you dont realise it is raining). At least I do! That is why I came up with this kind of project. Lets started!

Step 1: Tools and Components Needed:

2X2N2222

Buzzer

LED(Optional)

A breadboard

Some wire

A wire stripper and/or cutter to cut/strip wire

A power source

BIG headpones to avoid hearing the buzzer when experimenting(Optional)

Step 2: Placing Buzzer and Transistors

All locations are shown in the picture. Buzzer + is on the + bus

Step 3: Making the Connections

Connect all the components as shown on the picture. Optionally you can add a LED in parallel with the buzzer for visual alarm too.

Step 4: Connecting the Sense Wires and Sticking Them to a Surface

Sense wires should be connected as shown in the picture. You should be extra careful about this step.They should be sticked to a non-conductive surface as close as possible so a single drop of water can short them but they doesnt touch each other.

Step 5: HAVE FUN!

This circuit can work with a wide range of supply voltages. In my case i am using my variable power supply set to 5V. Buzzer and LED(if you added it) will be activated when somebody touches both of the sense wires or water does. For this version you will need to wipe away the water on sense wires to turn Buzzer and LED off. Thank you for reading `till the end and HAVE FUN!

Share

    Recommendations

    • Faux-Real Contest

      Faux-Real Contest
    • Sweet Treats Challenge

      Sweet Treats Challenge
    • Build a Tool Contest

      Build a Tool Contest

    4 Discussions

    0
    None
    OktayB3

    9 days ago on Step 5

    This seems simple but a type of innovation anyway. I liked it. I wonder how much rain will activate it?

    1
    None
    cavey

    Tip 14 days ago

    Although the project seems simple enough, I would appreciate a circuit diagram too, to see what's happening circuit wise.

    1 reply
    0
    None
    Efe_114cavey

    Reply 13 days ago

    Thank you for the tip, i noticed that a circuit diagram is missing too after publishing. I am now adding circuit diagrams to my instructable(s).

    0
    None
    BurcuB

    20 days ago on Introduction

    Thnx. The post is very useful for the beginners.