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Electronic timer clock

Discussion in 'General Electronics Discussion' started by paul60, Aug 15, 2018.

  1. paul60

    paul60

    22
    0
    Dec 11, 2010
    I need some help and advise about building a circuit that saves the time when a beam is broken.
    I breed and race homing pigeons. when the pigeons get back to there loft, they enter the loft through a small opening
    called a trap I thought if i had a beam of light across the entrance to the loft that would trigger a clock to store the time
    is this possible?
     

    Attached Files:

  2. Chemelec

    Chemelec

    291
    47
    Jul 12, 2016
    Yes it is Possible, But first you need to find a clock that has an option to Stop it and hold the time.
    And you can use a Photo detector or a Proximity Detector.
     
  3. AnalogKid

    AnalogKid

    2,297
    646
    Jun 10, 2015
    Very. Someone probably already makes one, but where's the fun in that? The least hardware effort uses a small microcontroller to do the counting, drive the display, and interface with the light beam system. But that takes programming skill, a complier, device programmer, etc. If you don't have all of that, then a single-chip digital clock circuit or module that is modified to inhibit the timebase when the beam is broken seems like a good place to start.

    What are your skill sets for uC programming, soldering, wiring components on perf-board,etc?

    ak
     
  4. AnalogKid

    AnalogKid

    2,297
    646
    Jun 10, 2015
    Re-thinking -- is reliable AC power available near the trap? Any AC-powered alarm clock will have a point between the power supply (where it gets its 50/60 Hz timebase) and the clock chip where a modification could be installed.

    ak
     
  5. paul60

    paul60

    22
    0
    Dec 11, 2010

    If i was to use a clock as in enclosed photo so when the light beam is broken it disconnect the battery
    now how do i go about finding a circuit to do this
     

    Attached Files:

  6. Bluejets

    Bluejets

    3,453
    698
    Oct 5, 2014
    I once modded a dick smith kitchen timer to monitor discharge time of nicad flight packs.
    Connected a set of small relay contacts across the stop button.
    Operation was, set timer to count up, set to zero time, start the discharger, then start the count up timer.
    At the end of the discharge period, the discharger would pulse the small relay on and then off again to simulate a "stop" button press.
    In your application, there are infra red slot switch modules or similar available on Ebay for maybe $2 which have a relay output that would do the same if connected via say a vane on the "in" door on your pidgeon coup.
     
  7. Bluejets

    Bluejets

    3,453
    698
    Oct 5, 2014
    This ir unit has a digital ( 5v ) output signal, which a resistor, small transistor and a relay could be added to give the desired "no volt output contacts" required to interface with whatever timer arrangement.

    https://www.ebay.com.au/itm/TCRT500...red++arduino&_from=R40&rt=nc&LH_TitleDesc=0|0

    This clock is an example with it's count-up count-down ability.
    Difficult part will be knowing how to get it apart and soldering two small wires across (in this instance) the start/stop button.

    https://www.ebay.com.au/itm/Digital...104051?hash=item1eda934773:g:k6gAAOSwMgdXyA6L
     
  8. Bluejets

    Bluejets

    3,453
    698
    Oct 5, 2014
    Lastly,( many other ways also BUT) using your clock and a standard stop/start circuit and a relay with a microswitch on the "in" gate as the stop switch.

    Note:-.....Microswitch could also be replaced by the previously mentioned IR relay contacts.
     

    Attached Files:

    Last edited: Aug 16, 2018
  9. paul60

    paul60

    22
    0
    Dec 11, 2010
    thanks bluejets I will try using my clock and the stop start circuit you supplied thanks
     
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