Free 173 Best Homemade Tools eBook:  
Remove advertisements
Page 3 of 3 FirstFirst 1 2 3
Results 21 to 24 of 24

Thread: Irrigation Flow System

  1. #21
    rgsparber's Avatar
    Join Date
    Nov 2012
    Location
    Phoenix, AZ
    Posts
    437
    Thanks
    110
    Thanked 696 Times in 250 Posts

    rgsparber's Tools
    PJ,

    The one thing I am positive about in all of this is that a patent IS impossible for anyone to get on this work. I have already defensively published it so now the flow monitor and control is in the public domain. It would be like trying to patent the wheel.

    As for the circuit, I expect that the product would be all SMT and not use the Pro Micro at all. Really not a big deal. I wish I could say the same for the flow meter. It must be accurate over a wide range of flow rates yet be low cost. A turbine based flow meter isn't going to cut it. Might have to approach Badger and have them make a special version with a pulse output. They make some that way but the closest I could see was one pulse per gallon. I need about one pulse per 0.03 gallons. That comes out to one pulse per rotation of the nutating disk. The magnetic pick up must be Hall Effect because a reed switch can't keep up nor have the longevity. Fortunately, the body of the meter would not need to be modified.
    Rick

  2. #22
    PJs
    PJs is offline
    PJs's Avatar
    Join Date
    Sep 2014
    Location
    Northern CA
    Posts
    1,432
    Thanks
    6,747
    Thanked 897 Times in 588 Posts

    PJs's Tools
    Rick,

    My professional experience in flow measurement & control is with Mass flow (DP/SP/temp), thermal mass flow and velocity for gasses and particulates. As I indicated before I thought your flow measurement could be done with Mass flow or Ultrasonic. Converting either to pulse output would result in a loss of all the accuracy and possibilities for control they offer.

    I do still think that ultrasonic would do a lot for your system but would require considerable changes to your input and likely the code. This also assumes you are using city drinking water that has a good/relatively constant conductivity for the low flow rates.

    The only other possibilities I see is a Mag Meter front end and it's also non invasive, which could be converted to pulses but would require some coils, additional power/circuits to read them and some messing around with calibration then convert that to a pulse through some kind of circuit...a comparator/inverter to (74LS121) monostable multivibrator or a couple of nor gates and RC, maybe??

    The links have good +/- write ups. Also ran across this white paper on a unique Mass Flow measurement.

    Not sure what type of prox sensor you tried but would think that would work. There are three basic types inductive, capacitive & magnetic in 4 flavors NPN/PNP/NO/NC....

    I also took a look at the Hunter offerings and they have some nice features at reasonable prices, including 2 wire pulsed output and their controllers have wifi for decent costs I thought based on features.

    Other than that, getting Badger to build it in based on your design is a plausible direction??

    Best of luck with where ever you take this. ~PJ

  3. The Following User Says Thank You to PJs For This Useful Post:

    Paul Jones (01-04-2018)

  4. #23
    rgsparber's Avatar
    Join Date
    Nov 2012
    Location
    Phoenix, AZ
    Posts
    437
    Thanks
    110
    Thanked 696 Times in 250 Posts

    rgsparber's Tools
    Quote Originally Posted by PJs View Post
    Rick,

    My professional experience in flow measurement & control is with Mass flow (DP/SP/temp), thermal mass flow and velocity for gasses and particulates. As I indicated before I thought your flow measurement could be done with Mass flow or Ultrasonic. Converting either to pulse output would result in a loss of all the accuracy and possibilities for control they offer.

    I do still think that ultrasonic would do a lot for your system but would require considerable changes to your input and likely the code. This also assumes you are using city drinking water that has a good/relatively constant conductivity for the low flow rates.

    The only other possibilities I see is a Mag Meter front end and it's also non invasive, which could be converted to pulses but would require some coils, additional power/circuits to read them and some messing around with calibration then convert that to a pulse through some kind of circuit...a comparator/inverter to (74LS121) monostable multivibrator or a couple of nor gates and RC, maybe??

    The links have good +/- write ups. Also ran across this white paper on a unique Mass Flow measurement.

    Not sure what type of prox sensor you tried but would think that would work. There are three basic types inductive, capacitive & magnetic in 4 flavors NPN/PNP/NO/NC....

    I also took a look at the Hunter offerings and they have some nice features at reasonable prices, including 2 wire pulsed output and their controllers have wifi for decent costs I thought based on features.

    Other than that, getting Badger to build it in based on your design is a plausible direction??

    Best of luck with where ever you take this. ~PJ
    Picking the best flow meter is part of turning my proof of concept into a real product. However,
    I have contacted Badger about a modified meter. My hope is that they will see it as a new market.

    The Arduino does have a decent analog to digital converter so a flow meter with an analog output could be made to work just fine.

    The proximity sensor I tried is inductive with an NPN output. I use them on my CNC mill with good results so it really surprised me that I could not find a sweet spot on the top of the Badger meter. I did use a small magnet to map out the structure of the steel. Also tried iron filings to prove to myself there was no magnet in there.

    Rick
    Rick

  5. #24
    Content Editor DIYer's Avatar
    Join Date
    Aug 2013
    Posts
    3,090
    Thanks
    353
    Thanked 693 Times in 630 Posts
    Thanks Rick! We've added your Irrigation Flow System to our Farm and Garden category, as well as to your builder page: Rick's Homemade Tools. Your receipt:



    Post your reply!
    Join 33,912 of us and get our 173 Must Read Homemade Tools eBook free.



    173 Must Read Homemade Tools

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Tags for this Thread

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •