Advice for a newbie regarding how to measure flow

Hi there,

Im well and truly a beginner here so please accept my apologies for my somewhat ignorant to what you may think is a simple subject:

So basically we need a rig that will measure the flow leaving a vessel and then for it to somehow (probably magic or pixie dust) to then convert that reading to a volume (ml more than likely) and then be able to send said info to a custom build app.

I have attached a photo of the type of flow meter I mean (doesn't have to be this exact one) as it has to be rather small...

But I need to know if this application would be at all possible to give a somewhat accurate(ish) measurement. I suppose it's more just getting the readings from the flow meter to the app then the app could in theory convert that into a ML reading??

again my apologies for the somewhat basic questions I just need to know if this setup would be possible and if its something a very beginner like myself could do at home??

kindest regards Hish and Steve

Almost any of the Arduinos would do what you want. The accuracy is in the sensor. Once you know its output you can convert it to whatever you want, it can do the math for you.

What is the task of the program in real life?

You just need to pick right sensor for your application based on the flow rate and accuracy you need.
10l/min sensor is rarely best for measuring 100ml/min flow.

very much like a drip type system one that we need to measure the amount of water leaving a vessel so that we know what is left in the container at the end if that makes sense. its more making sure it doesn't run out rather than anything

thank you for all the replies by the way super helpful. Goodness knows where to start but at least I know its possible

I don't think you will find a flow meter that will work with the small flow rates of a drip system.
You will probably need something that can measure the amount of water in the vessel.

First read the data sheet of the selected sensor and check whether the intended physical interface and flow rate match your project objectives.

sorry I don't think I explained it quite properly, its a 5ltrs vessel and as people drink from it I need to know what's left in the container so more a suck than a drip :slight_smile:

Place the tank on a scale.

It’s portable so won’t ever have a constant surface to sit on

So, doesn't it bother you that algae and unknown bacteria will be growing in your flow measuring device?

While it's totally doable with flow sensor, most common approach is to sense the water level on your tank.

It would be easier and more accurate to measure what is in the vessel rather than trying to estimate by measuring flow.
Is the contain round, square, cylindrical?
Is it clear?
Is it plastic or metal?

Thankyou for your input guys! So it’s a flexible container suppose you could say a bit like a drip bag or bladder so I don’t know how we could accurately measure such a container. We have looked at changing to solid container but wouldn’t work for the environment it’s in

Then a peristaltic pump that delivers specific volumes of water would be best.
The user would need to push a button.

This part needs exploring, rather than relying on that supply of pixie dust you have.

What device is this app running on?
How far from the container could the device be and still receive the communication?
Do you have the skills to build this app?

Then the meters you found won't be legal, in many countries. Any equipment in contact with food or drink needs to be made from certain materials, for health & safety reasons.

this is a very valid point bless you, maybe im back to the drawing board

I wonder which point you are referring to?

hi and thank you for your feedback, completely right it requires to be of certain material. Im very much in the ideas board part of this exercise. in required to apps and such then were not at that stage yet. I have investment capital when I require it im just trying to get a grasp of potential options. In an ideal world I would of liked to go down the weight route of the vessel but as it won't be static this would I guess effect its accuracy