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possible to make LED blinker at specific tempos?

Discussion in 'Electronic Design' started by [email protected], Apr 3, 2007.

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  1. Guest

    Hi all,

    I am a musician and not an electronics genius but wanted to ask a
    question and see if anyone could help me. I am looking for the
    materials and plans to make a VERY simple LED blinking device. It
    needs to be very small, (probably powered by a watch battery or
    smaller) and just blink a tiny, red, LED at a specific tempo.

    Basically this is similar to a metronome except that it is very small
    and there is no input for tempo, it just has an on/off switch. It is
    like a metronome that only blinks one tempo. I would want the ability
    to make different units blink different tempos but each one need not
    be adjustable.

    Does anyone have a circuit design or idea that would help me? Thank
    you so much!!

    Jason
     
  2. D from BC

    D from BC Guest

    Why not write a Visual C program to make a computer screen blink?
    D from BC
     
  3. I think the 'very small' requirement sort of rules this out.

    The best way to do this would depend on the skill set of the OP. A
    simple circuit built around a 555 would be easiest for someone with no
    programming skills. The downside being that this might not work well
    with a small watch battery.

    A small PIC with a simple program would be small, minimal parts count
    and efficient (battery-wise), but is going to need a bit of code (well,
    quite a few bits, actually).
     
  4. D from BC

    D from BC Guest

    Well..there was no explanation for it being small ...so I just
    neglected the smallness..
    I'm just bad that way.. :)
    Maybe program a PDA instead :)

    I recall seeing 1.5V specs for a cmos 555.. (Texas Instru.. IIRC)
    Maybe that'll work ok on a watch battery..

    A nice program feature in the PIC version could be an energy saving
    auto off into sleep mode. zzzzzz
    D from BC
     
  5. Donald

    Donald Guest

    http://www.google.com/search?hl=en&c2coff=1&q=555+metronome

    Lots of hits, so scan thru these till you find what your looking for.

    donald
     
  6. JeffM

    JeffM Guest

    You also need to learn how to use Usenet properly.
    (This is NOT "Google Groups"):
    http://66.102.9.104/search?q=cache:...oogle-cannot-muster-*-*-*-*-*-*-*-*-*-*-*-*-*
    If you feel *compelled* to ask the same question
    in MULTIPLE newsgroups, *this* is the prefered technique:
    http://66.102.9.104/search?q=cache:...dually+Disclaimers+deductible+Newsgroups-line

    Your technique
    http://groups.google.com/groups/sea...OnIFhuvvPyfmsHqZiDvCVswhrZ6TQxKj0ww&scoring=d
    is selfish and inefficient

    The last half of this thread explains WHY
    and fleshes out the (more acceptable) cross-posting paradigm:
    http://groups.google.com/group/sci....ups+*-*-*-*-two-groups-*-*-aren't-*-different

    The last post in that thread hints at why (clueless) Google Groupers
    are so reviled by those who read Usenet using a "newsreader".
     
  7. MassiveProng

    MassiveProng Guest


    You ned to grow the **** up.
     
  8. jazztpt99

    jazztpt99 Guest

    You also need to learn how to use Usenet properly.
    Sounds like someone pissed in Jeff's morning flux capacitor relay
    timing switch.
    I would think you could be more productive with your time than
    insulting me on multiple forums, isn't there a rule and website you'd
    like to paste for me on that jeffie?

    Allow me to explain. This is what normal guys do on saturday night:
    http://www.best-trans.com/images/subart/town.jpg

    Your technique:
    http://shezaf.net/zope/home/he/3/1128501915/kosovo 1999 man crying.jpg
    is just lame and unnecessary.

    love,
    jason
     
  9. jazztpt99

    jazztpt99 Guest

    I forgot to say thank you to those of you who took 2 seconds to help
    me instead of being an ass. thank you.
     
  10. Eeyore

    Eeyore Guest

    For accuracy you'll need a crystal oscillator.

    By far the simplest solution in terms of parts would be a tiny microcontroller
    e.g PIC or one of these which I like......
    http://www.nxp.com/pip/P89LPC901FD.html

    The product would consist of the micro, a crystal, a LED and a few passive
    components.

    You could have a couple of links on the pcb that you'd cut according to whatever
    tempo you wanted, i.e. it would be user programmable.

    Graham
     
  11. Eeyore

    Eeyore Guest

  12. jasen

    jasen Guest

    It's a pity the LM3909 is nolonger available,

    http://www.redcircuits.com/Page87.htm

    may be an option, but also may be too complex.

    Bye.
    Jasen
     
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