DIY Rain Alarm Using 555 Timer

Building a home made rain alarm.

This circuit beeps for about 40 seconds when it detects rain. This circuit uses a 555 timer.

This circuit can also be used with pressure sensor or with LDR for detecting light

Things Required

1. 330 Ohm Resistor

2. 1M Ohm Resistor - 3

3. 330k Ohm Resistor - 3

4. 10k Ohm Resistor

5. 100uF / 25 Volt Capacitor

6. 0.1uF Ceramic Capacitor

7. 0.01uF Ceramic Capacitor

8. LED

9. 555 Timer

10 Buzzer

11. BC177

12. 2 pin connector male & female

13. PCB Board, Wires& Battery

14. Plastic Bottles - 2

15. Soldering Rod, Soldering Wire & Soldering Paste

16. Insulation Tape, Scissor & Hot Glue Gun

Making Video

DIY Rain Alarm Using 555 Timer - Very Simple

You can watch the making of the DIY Rain alarm or continue reading the post on how to make the DIY rain alarm

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Circuit Diagram

Circuit Construction

Mount all the components on the PCB boards and connect the circuit according to the circuit diagram as shown in the previous step.

Rain Switch Making

1. To make the rain switch we need two bottles.

2. Cut them as shown in the 1st and 2nd image

3. Make two holes in the sides of the cap to insert the wires

4. Now insert the wires and secure them with hot glue. Note : make sure the ends of the wire are exposed and the two wires does not come in contact with each other

Finished Images

To watch the testing video CLICK HERE

Testing begins @ 8:58

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