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automatic water pump

Discussion in 'General Electronics Discussion' started by vead, Aug 27, 2015.

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  1. vead

    vead

    473
    14
    Nov 27, 2011
    Hello
    I want to make automated system that will control flow of water on basis of time

    water pump motor
    Voltage: 12V DC
    Flow capacity:1 Litres per minute

    microcontroller : 8051

    example
    If I need 1 Litres water then turn on water pump for 1 minute

    If I need 2 Litres water then turn on water pump for 2 minutes

    If I need 3 Litres water then turn on water pump for 3 minute

    how to control flow of water using controller on basis of time?

     
  2. chopnhack

    chopnhack

    1,573
    352
    Apr 28, 2014
    My guess would be that you would need to know when the valve opens to start the cycle and then use the internal clock or feed an oscillator into the μcu to keep track of time. Then program the μcu to fire the solenoid at appropriate times.
     
  3. vead

    vead

    473
    14
    Nov 27, 2011
    which type of valve are you talking ?
    I am thinking , mcu pin---> motor driver IC ---> pump motor
    set time by programming mcu
     
  4. chopnhack

    chopnhack

    1,573
    352
    Apr 28, 2014
    Ah, yes my mistake. When I first thought of the problem I was thinking constant flow of water under a constant pressure.

    You are correct, pin to a motor - you will have to figure the delay for priming the motor, head, delays to steady ouput if there are any, etc. to come up with the an appropriate variable to add plus time to achieve a per liter output.

    Will there be concern for drainage/leak down of pump when the circuit is not used for awhile? Any feedback mechanisms like a flow meter downstream of the pump or a float switch if there will be a reservoir?
     
  5. vead

    vead

    473
    14
    Nov 27, 2011
    mcu pin---> motor driver IC ---> pump motor

    I am seeing only two connection of pump motor (supply )

    how to connect pump motor with MCU?
     
  6. Minder

    Minder

    2,917
    613
    Apr 24, 2015
    A logic level gate Mosfet will do it.
    M.
     
  7. chopnhack

    chopnhack

    1,573
    352
    Apr 28, 2014
    I am not sure of what you are asking. Are you asking how to connect the physical (wires) of the pump motor to your circuit?
    Agreed, as I typed was going to say mcu leg to transistor to pump. The two leads of the pump are split between the source and return. Is this an AC or DC motor?
     
  8. Gryd3

    Gryd3

    4,098
    875
    Jun 25, 2014
    What's more important.
    -The run time.
    -The water volume.

    You need to be sure that your pump is accurate. Or you can call it good enough and just run it for a minute.
    Additionally, you could use something like a paristaltic pump, and count the rotations it makes. This would be less dependant on timing and more accurate for volumes.
    These pumps are very easy to make by yourself as well and can be food safe depending on the purpose of the water.
     
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