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Hall effect flow meter help

e14 Contributor

I have a hall effect flow meter and I can get it to read the current flow.....but, what I need to do is read the total  (say 100 litres) and then stop the flow thru a solenoid.  At the same time have a redundant timed stop that starts timing when the flow starts...energizing the solenoid, then de-energizing the solenoid (stopping flow) after 10 minutes.  I have no idea how to do the code here...please help.  Also, was wondering if I could done with Minibloq graffic programer? (or is minibloq limited)....as I'm using this for the rest of this project.  Thank you GJ.

  • 0

    Am I clear on what I'm tryin' to do?  Basically I want to fill a tank to a specific volume....and then stop the filling.  Tho I'm very new to arduino I am amazingly able to read the flow rate thru the flow sensor...I just can't get a total in litres or whatever.  Am I overlooking something simple and obvious?

     

    Oh,....and is this the right place to post this?

     

    Thanks....GJ

  • 0 in reply to e14 Contributor

    Hi Jack,

     

    I'm no expert in this : ( but maybe a float switch would be easier to judge a specific level, rather than a flow sensor.

     

    However, if you are already able to obtain the flow rate (e.g. liters per sec) , you just need to multiply by time  - the arduino has a wait function, so you can wait a specific time, e.g. 500msec. If the flow is variable, you do the same thing, but technically an integration, which again you can do by multiplication (and summation) - also known as area under the curve - wikipedia on integration will have the info.

  • 0 in reply to e14 Contributor

    You will need to count the number of pulses in a period of time to calculate the total volume.  The sensor specs. will have a factor specified which will indicate the liters/pulse. You will need a timer, a pulse counter and some math. An arduino will accomplish this very easily. Look at some of the basic examples of counters/timers on http://www.arduino.cc

    Good luck:   For more help, post your code/sketch or schematic.

    Bill

  • 0

    Thanks all...

     

    I'll have to test the rest of the code I have now....then post.  Perhaps I'm being lazyish...but I'm struggling and trying to do it without having to go back to school for a degree in calculus. Great suggestion...the float switch but I probably could get around using the arduino all together if I went that route.  I did try and haven't had much luck in finding any real examples of the flow meter/ total...tho, the timed stop I should be able to figure out.  Do you think if I counted all the pulses for the flow stop (and scaled it for the read-out) that would be accurate and consistent....hmmm?  Am I looking to deep....back to the lab.

     

    jack