Liquid Flow sensor circuit

Discussion in 'The Projects Forum' started by moh, Jul 30, 2009.

  1. moh

    Thread Starter Member

    Apr 23, 2009
    19
    0
    Hi,
    I am trying to make a automatic ketchup dispenser for that reason looking for some cheap flow sensor and some schematics that how can I interface it with arduino board.

    Is there any possibility that I can diy liquid sensor at home?
     
  2. Externet

    AAC Fanatic!

    Nov 29, 2005
    760
    57
    Measuring the flow of a ketchup type fluid would be better by counting turns or steps of a helical screw (or piston) dispensing it.
    Counting the number of turns/steps corresponds to a fixed known amount of fluid and then the amount can be known.

    A schematic would correspond to driving a stepper motor with your processor. There has to be many published somewhere on the net.

    Miguel
     
  3. moh

    Thread Starter Member

    Apr 23, 2009
    19
    0
    Thanks for the reply

    Can I use servo motor instead of stepper motor for liquid flow
     
  4. moh

    Thread Starter Member

    Apr 23, 2009
    19
    0
    HI,

    Can anyone guide me where can I buy rotary valve and piston for liquid flow.I tried farnell,maplin but could not find.

    thanks
     
  5. moh

    Thread Starter Member

    Apr 23, 2009
    19
    0
    Hi,again

    It will be very helpful if someone can direct me to a website which has schematics for liquid flow project
     
  6. beenthere

    Retired Moderator

    Apr 20, 2004
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    282
    With no concrete device or method selected, that is difficult. We do not know if your dispenser is to be used to handle food, or just for a working project.

    Ketchup dispenser pumps are often very similar to hand soap pumps. But you need to look into the subject and select some reasonable device.
     
  7. moh

    Thread Starter Member

    Apr 23, 2009
    19
    0
    Hi,

    It is a working project for ketchup dispensor in fixed quantities

    I am trying to implement this method mention in the link below

    http://www.fillers.com/piston filling machine guide.htm

    also I found this method on three different websites as Automated Bartender but I think it will be difficult to use with Ketchup

    http://www.betterthaneveryone.com/archive/2009/07/31/877.aspx

    http://claymore.engineer.gvsu.edu/~chana/auto_tend.htm

    http://www.ecs.umass.edu/ece/sdp/sdp04/ganz/project_specs/


    thanks for helping out
     
  8. THE_RB

    AAC Fanatic!

    Feb 11, 2008
    5,435
    1,305
    For some paste dispensing, they use a electric solenoid type valve, then provide a regulated low air pressure to the paste container. Then it can dispense accurate amounts of paste based on the time the valve is opened, which is linear to amount dispensed.

    Solder paste dispensers use the valve to control the air itself, which is applied to the end of the paste syringe. The syringe acts like a piston so a controlled pulse of regulated air pressure again gives a exact dispense amount. They sell these to dipense dots of solder paste for SMD.
     
  9. Externet

    AAC Fanatic!

    Nov 29, 2005
    760
    57
    Last edited: Aug 5, 2009
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