How to Make Water Level Indicator Alarm Using a Transistor | DIY flood sensor - Simple Circuit
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- Опубликовано: 11 июл 2024
- This is a simple but very reliable water level indicator alarm, aka flood sensor. Easy to build, Works well. In the video, I'll show how to build water level alarm using just a few components. For building, you will need, IRF540N MOSFET transistor (or similar), 1Mega Ohm resistor, Active buzzer, some wires and a 12V battery or a 12V power supply.
If you have any questions ask in the comments below. 
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It works! I tried it with 12v relay and it actully works!
Thanks for your video.
The resistance of the water between the two wires connected to a resistor in series will create a voltage divider. The 1M resistor is for cold or cool water, and 200K 150K is for warm to hot water. Less resistance hot or warm water, and more resistance is for cool or colder water. This circuit isn't the greatest in the world because the gate is being varied. Plus there's no pulldown resistor for the gate. This is more towards logic, but this circuit will do fine quickly. nice work.
Great video man, thanks
Bro it works properly.thank u bro
Thanks lot man
thanks your video sir..
i like your channel 👍🏽
Thanks!
Would this also work with a 12v relais instead of the Buzzer?
no.1 v.v.good
Brother, my water tank is at 60 feet from ground, so please suggest me the best mosfet to be used with 9 volt battery and 50W buzzer. What is the role of resistor you use in the circuit. Please reply
Sir i am using 14v with 3300,10v capacitor for running some device so which combination of transistor and resistor i use ?
Hi, circuit works well! Not sure how i can modify to make a 12v relay power a pump, i wired up a relay both things work well seperately but how can i trigger the relay when the water indicator buzzer starts , hopw you can help with maybe a simple diagram or suggestion, many thanks! steve
Imagine putting a few of them inside a gasoline tank, so each one of them indicates one digital bar on the dashboard.....
BOOOOOOM!!!!🤣😂😂😂
Super
Can I use to power on an Arduino board instead of a buzzer? Is there any chance of spike that may damage the arduino?
Hello. I enjoyed the video and tried it, and it helped me a lot. But how can I fix it if the voltage is 24v?
We can do the oposite,? when the botle become empty.
great sir.......please show method slowly don't mind.......thanks.
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Hi. I need to build a circuit that will sound an alarm or light a LED when the water level is below the probes? How to do it?
I hope you've solved the problem in the past two years, but one of the two simple modifications will likely work (not tested or designed): 1.) move the 1 MOhm resistor to connect the gate to the postive rail and put your electrodes between the gate and ground instead, or 2.) use the same schematic as shown but use a pMOS instead of nMOS FET.
Buzzer won't stop,even the wires are out of the water. What could be the problem?
Hi. How can I "inverse" the circuit, ie switch the buzzer on when the probes are dry and off when wet? Will it work if I change the 1meg resistor between +12v and Gate?
Hi. Yes, you are absolutely right about connecting the 1M resistor between +12V and Gate. In other words, connect probes instead of the 1M resistor, and connect the 1M resistor instead of the probes.
So we can connect the 1K resistor and the 12V wire (with one water probe in this line) and the other wire probe to the Source terminal isn't true?
Hi. Will this circuit drive a 12 v relay in the place of the buzzer?
Hi, yes, of course!
What is the item/device called that you attached to the two wires you placed firsted placed into water then said you can call it a water sensor by conecting the two wires? Also, what's the name of the buzzer you used? Can 3 or so button batteries be used is place of the 9v battery for more compact device? Can I use a bs170 n-channel mosfet? Thanks
Hi, that is "Pin header"... it is just a piece of plastic, with two pins. Don't know the model of the buzzer, it is 12V and less than 20mA, but it works even with 3V. Any battery/batteries will work if they have the correct voltage. For a buzzer like in my video a button battery will work. In most cases, the device will work from 6V to 15V (depends on the buzzer and MOSFET). And yes BS170 will work fine, you just need to connect it correctly, since it has different package and pinout. BS170 is 500mA max, but it is enough for small buzzers... my buzzer consumes less than 20mA.
@@ElectricalPro thank you for your help. I have followed your design just used bs170 mosfet, 1k resister, and 3-5v buzzer. It only works if the two lead wires are touched together. The current can't pass through my finger or even water. Should I use a higher resister such as the 1meg resister like you used? Thank you for your advice
Hi, yes, you need to use 1M, not 1K. Just to clarify 1M equals 1000K.
@@ElectricalPro thank you so very much for your help!
is it will harmful of using the water during alarm?
Does it work on mineral water which does not have ions(salt, NA CL , CS CL etc)????
Hi, It will not work with distilled water.
Mineral water will probably contain some salts, so it will work with it.
How can i modify the schematic for the high/low output to be used as input in a microcontroller?
So that i dont burn it.. 3v I/O pin.
Maybe a resistor and a zener diode could help. Or just a voltage divider using resistors.
@@ElectricalPro brother my water tank is at 60 feet from the ground so please suggest me the best mosfet for 9 volt battery and 50W buzzer. What is the role of resistor you use in the circuit.
Just curious, what can't you just hook the bell up to the power on one end and the sensor along the wire on the other end?
You mean why do we need MOSFET at all?
Well, that is because water is not a good electrical conductor, so there will be not enough current for the buzzer to work. MOSFET in this circuit works as an amplifier of current.
@@ElectricalPro makes sense now. Thanks so much!
Hello, it works with 9V battery?
Hello, yes.
Sir i. Will.use 9 vol betry ? What can do this work water level.?
Hi, Yes, this project can work with a 9V battery without any modifications of the circuit.
hi bro, i'm using transistor IRF 630 N , why the buzzer make a sound while the probe of sensing didn't connect ???
Hi, Probably your IRF630N is dead. Disconnect the wires together with the probes, and test it again, and if the buzzer still makes noise, it means IRF630N is dead. Also, check if you connected everything correctly.
okey bro, i'll try it.
Hello,can i use irfz44n mosfet?
Hello, yes
Hi ...I can use 5v battery?
Yes, but the buzzer also should be able to work with 5V. And use IRL540N instead of IRF540N, because IRF540N is not good with 5V. Also, probably you will need to adjust the resistor value.
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Need a 1.5v supply to switch led on when water isn't present, off when wet
The water is not conducting electricity when I place the terminals in water
Can this cause current in the water??
Hi, yes, but since we use 12V it is absolutely safe. Moreover, if you use a galvanically isolated power source (a battery for example), then it is even more safer. The very small current will still flow from one electrode to another, but it will not flow through your body even if you put a finger in the water.
What is the range in metres as tank is 100 mtrs away from my home
I don't know what is the maximum length of the wires, but theoretically, it should work with 100 meters.
I don't see any reason why it will not work, but I can't say for sure, I haven't tested it with such long wire.
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This would be very useful if it worked the oposite way, so when the water level dropped in your aquarium it would sound the alarm so you know you have a leak to fix !
you can put a relay
Please shear material list
Why you use mosfed transistor
Well, I use MOSFETs because they are controlled by voltage and not by current, and it has a lot of advantages... For example in this particular circuit, we can easily tweak sensitivity by using a different resistor value. It is of course possible to use for example a bipolar transistor, but it must have a high enough current gain, or I will have to use two transistors connected as a darlinglon pair... But with MOSFETs it is all much simpler and more predictable. One more advantage: you can connect even 50W buzzer to this circuit, and it will work without a problem.
@@ElectricalPro thanks
What will be the cost of all
Hi, about 1 or 2 US dollars. (without a power source).
P.S. you can use a cheaper MOSFET, for example, 2N7000 instead of IRF540N.
Using such a high rating mosfet is an over kill
Hi, yes, I absolutely agree. I was just using what I had at that time.
In that context is awesome ... But the cheapest and most sensitive way is to use a Darlington pair or an op-amp
Or we can just use a cheaper 2N7000 MOSFET.
I am not sure that the high sensitivity it a good thing in this particular case, because it may pick up some interference when it used with the long wires. Also, you can control sensitivity by changing the value of that pull-down resistor (I am not sure whether it is correct to call it change of sensitivity, but you got the point). I agree that there are plenty of ways to make this device...
Yep ... Thanks for that ... But i don't think i can operate it on 6v or 3v
Yes, you are right IRF540N has 2V - 4V gate threshold voltage, so with 3V it probably will not work at all. It may work with 5V or 6V, but I am not sure that it will work reliably. But if you use IRL540N instead of IRF540N than it may work even with 3V, because IRL540N has 2V gate threshold voltage. I have a project where I control IRL540N with 3.3V PWM which then controls 12V LED strip, and it works fine, I also tried IRF540N instead and it didn't work with 3.3V because of that higher threshold voltage, so one letter in the markings makes a huge difference.
This is NOT GOOD for CARS!!!! you have 12 volts IN THE WATER++++ electrolysis!!! draw up ANOTHER circuit, where 12 Volts will NOT be in the water,please _