YF-B10 water flow sensor - simple rectangular waveform detector

Question

Hi All:) .
I have purchased a flow sensor for hot water detection in the shower (YF-B10), to trigger the air extractor when bathing. Unfortunately, I can't find any sensible finished PCB for detecting the TTL rectangular waveform from the Hola sensor. There are circuits on Arduino, but here it's a simple "is" or "isn't" signal and activation of a relay. Suggestions welcome.

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kaz69 · Accepted Answer

How about something like PWM converter 0-100% to voltage 0-10V?

hindoos · Accepted Answer

I had a similar flowmeter and it was able to stay in the high state after disconnection so conversion with PWM will not work here in my opinion.
With one element I don't know but maybe some relay with a timer hold and load it with pulses via mosfet on the input?

hindoos · Accepted Answer

An Arduino Nano will do. The external interrupt on the Nano is handled on pins 2 and 3. And you drive the relay from any selected pin via a transistor - which one? This is something you will have to choose depending on the relay.
Here is the documentation: https://www.arduino.cc/reference/en/language/functions/external-interrupts/attachinterrupt/
Take a look at the example code.

sisko · Accepted Answer

Search the electrode forum, pulse detection circuit. One example topic Link .

xury · Accepted Answer

Example code for esp32: Added after 30 [minutes]: .And below is the simple code for the Arduino: Pin 2 sensor Pin 4 relay. Code: ArduinoLog in, to see the code .

Sprinter62 · Accepted Answer

And isn't it simpler to buy a ready-made board such as this:

Janusz_kk · Accepted Answer

I think the simplest would be something like this

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it has a processor, it has a relay, only you have to connect a flow sensor instead of a temp sensor (thermistor) so

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You need to look for 5V on the board and connect the resistor and the sensor there as I have drawn, the capacitor needs to be chosen, but first you need to try it out, the sensor will average out the voltage on the input and the thermostat will show some temperature, if it is too high, you need to give a bigger capacitor, then you need to set the temperature threshold a little lower or higher depending on what you want it to do.

ramzesq · Answer

I think mate Hindoos' option is cool, but I need to find a finished board, and I already have the timer . The option of playing around with a prototype is out.... Maybe colleagues can suggest something... some specific circuit that can be adopted.... I looked on AliExpress but small my schools.

hindoos · Answer

Even so, I think this will work more stably on the microcontroller we plug the input straight into the microcontroller interrupts and make a simple count down timer that will turn off the fan if no pulses from external interrupts are coming into it. After all, we want to detect edges and not a high or low state - because this one can set itself at will when the water is turned off.

ramzesq · Answer

And the specific solution is Arduino?E.g. this : .Just a question of where to connect the relay that will react to the edge and its absence.

ramzesq · Answer

Thanks, but I don't think I'll be able to grasp it all....
Buying the components, then how to enter it all into Arduino.... and still selecting a transistor.... I think I've shot myself in the knee with this idea.... Because as more of an electrician I am...
I tried to find a ready-made board for these sensors but found nothing....
Thanks for your help:) )

ramzesq · Answer

.The simplest solution, that's the sort of thing I'm after, but.... price for a small relay, 2 capacitors, 2 diodes and two terminals - 83 PLN knocks down.... Does anyone have any idea what the circuit diagram for this board looks like?

hindoos · Answer

This knowledge just costs £60 .

ramzesq · Answer

. A non-advanced electronics technician can probably figure it out in five seconds

hindoos · Answer

Well then, to battle .

ramzesq · Answer

.Which I hereby do by uploading this post

Alpha · Answer

A long time ago I made such simple detectors for a flashing Led (four separate channels). With some minor adjustments you can use.

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PS:I hope I have understood the problem correctly. If not, apologies

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ramzesq · Answer

. Does anyone know and can draw and paste into a post what the schematic for this circuit board looks like? That would solve the problem .

inot · Answer

. And isn't it easier to buy a ready made module.

ramzesq · Answer

The module costs 83 PLN... And that's why it's probably easier to ask for a schematic from someone who knows...such modules on Allegro are 15-20 PLN each....

inot · Answer

How to draw the diagram as the other side is not visible in the photo.

ramzesq · Answer

And here is the buried dog But I think it's no problem for an electronics engineer, because it's only 3 diodes, a relay and 2 capacitors.

inot · Answer

. But there are certainly other components on the other side (as otherwise this module was not that expensive).

ramzesq · Answer

But there are certainly other components on the other side (because otherwise this module was not that expensive).[/quote].
There are certainly no other components on the other side, because with such a small board it is a misunderstanding to design the circuit and assemble the components by two different methods, i.e. traditional and SMD.

Krzysztof Kamienski · Answer

@ramzesq And why didn't this Fellow buy a flow sensor of the rotameter type with a NO/NC reed switch, but a sensor for flow measurement , and now you are complaining about the price of the relay board ?

ramzesq wrote:
But there are certainly other components on the other side

Not necessarily, as a constant RC (integral) circuit or a diode with a capacitor would suffice.

ramzesq · Answer

When you type the phrase water flow sensor into Google, rotameter didn't pop up. I used the most logical phrase. The one I bought and installed is a cheap and popular solution, so I thought there were a multitude of solutions for this type of sensor.... But it is a pity big foam sensor mounted. I will move the question to the electronics section. I consider the topic closed. Thank you all for the hints . pepływu water&source=lmns&bih=711&biw=1536&hl=en&sa=X&ved=2ahUKEwjl2oKA-_X6AhULhxoKHb0YAf4Q_AUoAHoECAEQAA

Alpha · Answer

Since you wanted to copy the board shown in the offer, I guess you have some idea about soldering and electronic components. Why don't you want to use my simple circuit from post #17? I can help you modify it.

ramzesq · Answer

.Thanks for the idea Alpha, but I'll honestly say, I've outgrown the modification of your layout. On the other hand, it would be nice if all those who buy or already have this or a similar flow meter could find a simple and cheap solution to the problem here .If you feel like helping then great! Thank you in advance .If I may make a suggestion about modifications, it would probably be great if the circuit would work with different supply voltages, if possible. I work on 24V DC but there are probably plenty of systems on 12V DC.

ramzesq · Answer

I super:) Plate 17 PLN and minor modifications. Thanks:) .

YF-B10 water flow sensor - simple rectangular waveform detector

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