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led heartbeat

Discussion in 'LEDs and Optoelectronics' started by MadBoy79, Nov 30, 2012.

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  1. MadBoy79

    MadBoy79

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    Nov 30, 2012
    hi all
    i need from help .
    I want build simple led light circuit - something like this


    and if his circuit to change the frequency .

    Thank you in advance.
     
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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  3. CocaCola

    CocaCola

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  4. MadBoy79

    MadBoy79

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    Nov 30, 2012
    I'm looking for a scheme that turns on and off with this LED effect - compared with conventional multivibrator 555.
    When I use the red Power LED and Built-in plastic heart - the effect will be great :)
     
  5. CocaCola

    CocaCola

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    Did you bother taking 5 minutes to follow the link provided by Steve to Kris' design? Probably not based on this response...
     
  6. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    Beware that the circuit you've shown us has unused inputs of the 4017 left floating.

    This is poor practice and you should tie them somewhere. Check the datasheet and tie reset to wherever DOESN'T reset the chip, and enable to wherever it DOES enable the outputs.
     
  7. CocaCola

    CocaCola

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    On that note there are also other problems with pin 13 and 15 left floating (noted above), as shown you will not get reliable results, it's really a roll of the dice on what it will or won't do with any particular start up...
     
    Last edited: Dec 1, 2012
  8. MadBoy79

    MadBoy79

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    Nov 30, 2012
    ok :)
    I just showed you the idea. :) I know there are errors
     
  9. MadBoy79

    MadBoy79

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    Nov 30, 2012
    hello :)

    What do you think :)



     
  10. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    Cool!

    It may be better if you could diffuse the light from the LEDs a little more, but unless you're looking directly at them, the effect seems nice.
     
  11. cjdelphi

    cjdelphi

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    a 3rd option is to use a micro controller.

    it would be only a few lines long and only a very basic chip would be required to do a heart beat effect and a whole lot more..... (eg, attiny85 or a PIC)
     
  12. cjdelphi

    cjdelphi

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  13. duke37

    duke37

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    The circuit refered to in #14

    The 4017 has its outputs almost shorted to ground. This may be too much for it. Put a 1k resistor in the outputs to limit the current.

    A capacitor across the power supply would not be disadvatageous.
     
  14. MadBoy79

    MadBoy79

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    Nov 30, 2012
    Sorry I forgot to show the version of the scheme.
    The picture that comment - scheme gives errors and does not work.
    After using a diodes and capacitor in parallel with the LED bar = scheme is working not even stop for a whole day.
    http://img841.imageshack.us/img841/6562/ledheartbeat1lastversio.jpg


    in the first video I did not use a capacitor.
     
    Last edited: Dec 31, 2012
  15. KrisBlueNZ

    KrisBlueNZ Sadly passed away in 2015

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  16. MadBoy79

    MadBoy79

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    Nov 30, 2012
    HAPPY NEW YEAR :)
     
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