1-99 minutes 2-digit time counter 12v

Discussion in 'The Projects Forum' started by speebman, Jun 24, 2016.

  1. speebman

    Thread Starter New Member

    Jun 22, 2016
    9
    0
    hello everybody
    for my project i need to make a minute counter 2-digit display to work with 12V input
    it just needs to start counting up the minutes from the moment it got power
    and after power goes off, and on again, it will start counting from the beginning

    i couldn't find any complete board without a relay attached to it
    i dont need any relay, just to know how many minutes did it pass from the time it got power
    if you can direct me to a site were can i buy a made board it will be great
    if not, i can build one with your help


    thank
    danny
     
  2. dannyf

    Well-Known Member

    Sep 13, 2015
    2,196
    420
    get a board with the relay and unsolder the relay.

    done.
     
  3. speebman

    Thread Starter New Member

    Jun 22, 2016
    9
    0
    yes but all the relays are counting backwards
    i need to counte foreword the min



    danny
     
  4. dannyf

    Well-Known Member

    Sep 13, 2015
    2,196
    420
    well, find a counter, and feed it a minute signal from a second counter that counts down from 1 minute.
     
  5. crutschow

    Expert

    Mar 14, 2008
    13,905
    3,518
    You could buy a kitchen timer that counts up or down (I have one I bought at Bed, Bath & Beyond) and hack into the switches to reset it and start counting upon power up.
    A couple of transistors and a few resistors and capacitors should be able to do that.
     
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