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12 or 24v Timer design

  1. Mar 6, 2012 #1

    This is my first time on this site and it looks great so far.

    It doesn't matter if it is 12v or 24v either will do which ever is the easiest.

    What I would like is to be able to run say up to 6 12volt 5 amp water
    pumps for my hydroponics individually say every 2 hours for 10 minutes.
    In other words the first pump switches on for 10 minutes then off then
    no. 2 pump starts etc, automatically. Only 1 pump runs at a time.
    If a timer can be used that I can adjust accordingly would be great.

    I would like to feed it from 240 volts if I can.

    I was told that a home irrigation system with timer on it can be used with some extras added.

    I am not electronically minded so to work this out is beyond me.

    Can someone draw up a design for me, and if interested make it and I would gladly pay for the services.

    Can someone please help.

  2. jcsd
  3. Mar 9, 2012 #2


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    Gold Member

    hi billa

    remember google is your friend ... there 's so much info there on commercial programmable timers with hi voltage switching like this one that I use


    dunno where you live but you will probably find it available ... they are brilliant and a good price
    have a look at the specs and see if it will do what you desire as far as time setting

    I use one for a house use to switch on and off 240V lighting for the tropical fish tank when on holiday

  4. Mar 9, 2012 #3


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    Science Advisor
    Gold Member

    Welcome to Physics Forums.

    How fancy do you want to get? And are you comfortable with PCs and some wiring?

    If so, then the MULTI-EVENT RELAY CONTROL board may be of interest.

    You need multiple outputs that can be individually programed. If you add a 24VAC supply (24vac secondary of transformer say), add the pump relays (as these on-board relay outputs are only rated at 3amps), and program the outputs with a PC using a RS-232 COM, you can have lots of flexibility with you times, intervals, etc. It would be easy to change the programming and experiment.

    Anyway. Have fun.
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