OT: Need to make a timer....

Discussion in 'Software and Programming' started by 10K Pete, Jul 15, 2016.

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  1. Jul 15, 2016 #1

    10K Pete

    10K Pete

    10K Pete

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    I figured this was as good a place as any, so here goes:

    I want a timer for intervals up to, say, 5 or 6 minutes. I want to be able to
    set it for an interval. Then I want to set it going and at the end of the interval
    have it beep a couple, three times and shut off.

    I want the interval setting to stay at what ever I set, not have it zero out and have to be re-set each time. I just want to be able to set it once and hit the button each time I use it. Of course the interval has to be changeable easily,
    in seconds graduations. It can have a digital display I suppose. Must be battery operated, a single AA preferred. And of course the battery must
    last years!!:eek:

    This timer will be used for tea and coffee brewing. I'll package it to sit on
    the counter. With the timed interval pre-set I can just hit the button and the
    thing will beep after the time! Hopefully.....

    So I'm not at all conversant in electronics design, but I can build such a circuit,
    from a design.

    I've searched high and low for a few months and failed to find anything meeting
    my needs.

    Can anyone help me by providing a, hopefully, simple design for this?
    I could make a pcb if necessary but would prefer perf board type build.

    Thanks for any assistance,
    Pete
     
  2. Jul 15, 2016 #2

    Buchanan

    Buchanan

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  3. Jul 15, 2016 #3

    Herbiev

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    If you google the old 555 chip you will find something suitable
     
  4. Jul 15, 2016 #4

    GailInNM

    GailInNM

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    Pete,
    This timer mayl meet your needs. For several years I have had one of these in the shop that I use almost daily. Mine is a different color but other than that I think they are the same.
    Using the MIN & SEC buttons you can preset a count down time. When you touch the Start/Stop button it counts down to zero and the alarm sounds. If you don't do anything the alarm beeps for 60 seconds then the timer resets to the preset value. You can stop the alarm by pressing the Start/Stop and the timer will reset to the preset value ready to go again.

    The only thing I don't like about it is the buttons are very sensitive to the touch so it is easy to brush against them and screw up your settings. I put a 1/32 inch thick plastic bezel around the buttons and that prevents that problem. I think it meets your specs except the beeping goes on for a minute if you don't hit the Start/Stop button.
    Gail in NM

    http://www.ebay.com/itm/112001944845?_trksid=p2055119.m1438.l2649&ssPageName=STRK:MEBIDX:IT
     
  5. Jul 15, 2016 #5

    Cogsy

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    I immediately thought of a simple kitchen timer like this one for $2.79 and free shipping : http://www.ebay.com/itm/Kitchen-Clo...01944845&tpos=top&ttype=price&talgo=undefined

    At least it has all the workings you want and you could make your own housing to whatever design you like. In fact you've got me thinking about getting one myself and custom making something nice for my better half - maybe a steam-punk appearing device...hmmm...
     
  6. Jul 15, 2016 #6

    10K Pete

    10K Pete

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    Thanks guys! The solution was right under my nose in the lowly kitchen
    timer like Gail linked to.

    I never cottoned to the fact that they would keep the set time, at least some
    of them anyway, and would serve the purpose. I've never really 'played' with
    one, see?

    I did Google the 555 and found a couple of circuits that were very close to
    meeting needs, and would, with minor additions.

    I looked a the ones on eBay and added a couple to my watch list (including the
    ones Cogsy and Gail found) so there are plenty to choose from.

    But I'm off to the kitchen to see what is there as I seem to recall some sort
    of electronic timer residing there in the past.....

    Thanks again,
    Pete
     
  7. Jul 15, 2016 #7

    GLCarlson

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    True. But- you'll put a lot of work into it. Parts, board, a bit of design. Kitchen timer is best/cheapest.
     
  8. Jul 16, 2016 #8

    10K Pete

    10K Pete

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    A safari through the kitchen yielded an electronic timer that hasn't been used
    in a decade. Replaced the battery and it works. The function isn't as straight
    forward as I'd like but I'll play with it. And, if it irks me too much I'll get one
    of the ones linked to on eBay.

    Right under my nose the whole time......l:wall:

    Pete
     
  9. Jul 16, 2016 #9

    10K Pete

    10K Pete

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    I was looking at some of the circuits on line and a couple of very simple
    ones are about 90% of what would be my ideal. I may, in my spare time :eek:,
    look into making the 'perfect' brew timer. Unless one of the off-the-shelf
    models really suits perfectly.....

    Pete
     
  10. Jul 16, 2016 #10

    james_III

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  11. Jul 16, 2016 #11

    10K Pete

    10K Pete

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    But that's the big joker in the deck..... I don't even know what a arduino is!!! I might as well flap my arms a try to fly. :eek:

    Pete
     
  12. Jul 16, 2016 #12

    ShopShoe

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    Now that film photography is almost gone, there are lots of darkroom timers out there. Most of them are not battery powered, but you could probably find something you could use. Around here they show up at auctions, garage sales, and thrift stores. Pay attention to the timing interval(s) they have. Some control AC outlets, some have alarms, some have both.

    Search for "Darkroom Timer," "Enlarger Timer," "Photo Timer," etc.

    --ShopShoe
     

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