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Can I attach a water pump (12v) to raspberry pi (3v)?

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Discussion in 'Power Electronics' started by darpan_r, Oct 17, 2021.

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  1. Oct 17, 2021 #1
    darpan_r

    darpan_r

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    Oct 17, 2021
    I'm starting my first raspberry pi project. Its an irrigation system.I've got a waterpump whose input is 12V and only has a usb cable attached to it. I'm using raspberry pi 3 model A+ whose input is 3V. I think if I connect the pump to the raspberry, it'll fry up the raspberry. please can somebody help me how I can fix it?
     
  2. Oct 17, 2021 #2
    Bluejets

    Bluejets

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    Oct 5, 2014
    Use a logic level mosfet as an interface.
     
  3. Oct 18, 2021 #3
    Alec_t

    Alec_t

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    Welcome to EP!
    Surely USB is 5V, not 12V? Can you post a link to the pump specification?
     
    Martaine2005 likes this.
  4. Oct 24, 2021 #4
    darpan_r

    darpan_r

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    Oct 17, 2021
  5. Oct 24, 2021 #5
    bertus

    bertus Moderator

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    Nov 8, 2019
    Hello,

    There seem to be two versions of the pump on that page.
    Using the pull down menu I see:
    USB DC 5V 3W or
    DC 12 V

    The USB version uses a USB connector.
    The 12 Volts version uses a different connection.

    Bertus
     
  6. Oct 28, 2021 #6
    darpan_r

    darpan_r

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    Oct 17, 2021
    Hi! yes, you're right! there are two versions and the USB version uses 5V, but the question now is will it still work? given the input for raspberry pi is also 5V. thanks!!
     
  7. Oct 29, 2021 #7
    Alec_t

    Alec_t

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    Jul 7, 2015
    If the pump is rated 5V 3W then the nominal running current is ~0.6A. AFAIK the Pi outputs can't provide that current, so a buffer stage between the Pi and pump will be needed. See post #2.
    Note that the start-up current of the pump will likely be several times the running current. The buffer stage must handle that. Also, unless the pump already has one internally you will need a reverse-biased diode across its power terminals to catch voltage spikes which occur at switch-off.
     
    hevans1944 likes this.
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