Rain alarm circuit
Description.
Here is a simple rain alarm circuit that produces an audible alarm when ever rain falls. The rain detector circuit is based on two transistors (Q1 & Q2) and a NE555IC (IC1). The two transistors are wired as a switch which goes on when the base of Q1 is shorted to the positive of the supply by the rainwater falling on the sensor. When the transistors are ON power supply is available to the IC1 which is wired as an astable multivibrator. The output of IC1 drives the speaker to produce an alarm.
Circuit diagram with Parts list.
Notes.
- Assemble the circuit on a good quality PCB or common board.
- For assembling the sensor cut a 2×2 inch mica or plastic sheet. Arrange two single stranded wires (running parallel 2mm close to each other) on the sheet as shown in figure below. Remember the wires have to be non-insulated. Sensor ready.
- Now you can connect the points A&B on the sensor to corresponding points A&B on the circuit.
- POT R2 can be used to adjust the sensitivity.
- To test the circuit, make all connections and power up.Place a drop of water on the sensor so that two wires become shorted through water. Now the alarm starts sounding. If not adjust R2 to get the alarm sounding.
- Use a 9v battery or a 9V regulated DC supply for powering the circuit.
- Do not connect speakers less than8 Ohm impedance as load. It will damage the IC.
- A piezo buzzer can be also used instead of the speaker.
Sensor schematic.
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pls send it on my email add. krizza_gallaza@yahoo.com
thank you
this circuit may be a great help, pls send the other details/informations of this circuit…on how it works?
and can i ask something?
“if you change the value the resistors (any resistor) what is the effect to the circuit?” same with the capacitors?
thank you so much… i need this by nextweek…
your reply is really appreciated…
pls send me the theory of rain alarm.i am 12 class student. thanks guy!
I am Ronit of class 12th. It gives me satisfactory knowledge. Morever that’s the perfect project to me.
Hi Satish and Samson the article is very clear about the operation and the notes gives you other details. there is no need for any other information. If you still have doubts, please ask specific questions it will be answered
Pls this circuit will be of great
help,if you can send the details
to sbgaikwad38@yahoo.com
I’ll be most grateful sir cos its
important for my project.thank
you.
Hi am a final Year of elect/elect pls I lov this project I want you to send the full detailS of this project to. My box and description and the components thanks
Pls this circuit will be of great help,if you can send the details to emma44tou@yahoo.co.uk I’ll be most grateful sir cos its important for my project.thank you.
Hi Rajesh use glass epoxy straight line bread board PCB. use alternate tracks in parallel. use PCB vertically such that tracks are parallel to ground.
hi, I am student of final year,i want to do this rain alarm project as mini project please tell how to make this sensor breifly please reply soon because 25 nov is the last date of submission of the project because this sensor is not availabel in the market. can i use light sensor or any other sesoor ?
pleae ! thanks
nice
ya it is working model
hi,pls snd me al details of rain alarm project….hw it works,
its components name n also describe the details of every components….
its a very interesting circuit….i will try to do this…thank u
Hi jain within INR100.
hiiii,
m student of final year ec,want detail information for the rain alarm project.how much will it cost.please reply me as soon as possible..my id is..
jainaman8@gmail.com
hi please help me.only 1 day is left for the submission of rain alarm project
Hi Neo keep the sensor in an angle so that the water droplets flows out, which will ensure the alarm to get reset soon.
great dude simple and working. but once the water drops on the sensor it is shorted now even if the rain stops its still shorted due to water around.
hi
can you do the PCB layout of the circuit please?!
thank you.
Maximum 8 ohms 2 watts tweeter will do.
Thanks for reply one question is more that is:
please tell me speaker watts value.?
Hi Zubair R1, 3, 4, 5 are 1/4 watt 5%. C1 & 2 are ceramic disc capacitors. R2 Variable pot used as rheostat. C3 is electrolytic capacitor can be 12V Working voltage or more.
I have a question, please tell me the each resistors watts value and which type of capacitors are used and also tell me C3 capacitor volt value.Thanks reply me soon.
today i make rain alarm circuit its working..
Hi Tala till the sensor becomes dry the alarm will not stop. Hi Anil once the water drop bridges the sensor it gives the bias to the emtter follower pair that in turn gives supply to 555 oscillator, which produces the sound.
hi,
question
does the output stop until the rain stops?
Oi, estou com um pouco de dificuldade em encontrar os capacitores de 0,01uf, teria como substituir por um outro?
we have not tried it but it seems interesting
please help and contact me at +919888405485
hiiiiiii.
i want a detailed project report on rain alarm for my +2 board exams.
please help……… please help……………
i tried rain alarm circuit..it is working………..
This circuit requires calibration before use and it can be done adjusting the POT R2.
i tried ur ckt of water alarm.but it is sounding without the droplet.it starts sounding as soon as i plug it.please help.
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