make LED flasher , with ON off functions

Discussion in 'General Electronics Chat' started by athulascc, Jun 28, 2015.

  1. athulascc

    Thread Starter Member

    Aug 15, 2014
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    I need to make LED flasher. that contains one push button.

    when I press push button LED turn on.
    Next press it flash 1HZ
    Next press turns off.

    can I do this using 555 or 556?

    or do I need to go for micro controller.
    can you suggest me cheapest way to do this?

    thanks
     
  2. pwdixon

    Member

    Oct 11, 2012
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    Sounds like you could do this with a dual flip-flop and a 555, that might be the cheapest option just compared to a processor based solution, but a very small processor might win it depends on what you are including in the costing, eg pcb? assembly costs? programming costs? operating power supply?
     
  3. athulascc

    Thread Starter Member

    Aug 15, 2014
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    I am considering the power consumption and the cost. since I am going to mass product it, I consider it. I use 2 CR2032 batteries
     
  4. Wendy

    Moderator

    Mar 24, 2008
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    I have done it with a 555 and a 3 way switch and a 555.
     
  5. pwdixon

    Member

    Oct 11, 2012
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    Do you have a projection on quantities and target max component cost?
     
  6. athulascc

    Thread Starter Member

    Aug 15, 2014
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    I am considering the efficiency and cost. also since I use 2* CR2032, I have 6v. but I am not sure it will work well when battery discharge. so i hope to go for 3.3v logic . is 555 ic work with 3.3v? and cd4017?
     
  7. Wendy

    Moderator

    Mar 24, 2008
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    look into a CMOS 555, something like a 7555.
     
  8. pwdixon

    Member

    Oct 11, 2012
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    How is this a response to my question? Why quote me if you are just going to ignore what I wrote?
     
  9. Alec_t

    AAC Fanatic!

    Sep 17, 2013
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    What LED current are you proposing to use? A CD4017 may not be able to provide enough.
    For your own use or commercially? I don't see there being a mass market for this :(.
     
  10. athulascc

    Thread Starter Member

    Aug 15, 2014
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    CAN I use Atiny4? is it cheap way than 555+CD4017?
     
  11. Wendy

    Moderator

    Mar 24, 2008
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    You can use a lot of uC, being programable they will fill most of the bill by themselves. You will have to write code and program each chip, which is another issue.
     
  12. athulascc

    Thread Starter Member

    Aug 15, 2014
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    I have seen many cheap devices with Black Dots. I guess it is uC. (eg: calculators, watch) actually is it cheap way? how can we do it?
     
  13. Alec_t

    AAC Fanatic!

    Sep 17, 2013
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    Those 'black dots' are 'chip-on-board' ICs. They are proprietary custom-built devices. Cheap per unit if you want to order them by the million!
     
    athulascc likes this.
  14. athulascc

    Thread Starter Member

    Aug 15, 2014
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    can I find CD4017 , 3.3V logic Ic, I tried to find, but I couldn't. I need 2bit decade counter like 4017 but no need 10 outputs. only 4 enough. and need to work in 3.3v. can I find ?
     
  15. athulascc

    Thread Starter Member

    Aug 15, 2014
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    or. if I can find 3 way push button, great. that is the best way I can do it. but unfortunately 3 way self push buttons are not seems available. :(
     
  16. athulascc

    Thread Starter Member

    Aug 15, 2014
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  17. athulascc

    Thread Starter Member

    Aug 15, 2014
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  18. pwdixon

    Member

    Oct 11, 2012
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    The switches you mention aren't very low cost and obviously size isn't an issue.
    A 4017 is a counter which I assume you think you need to get a low frequency pulse why not use a 7555 alone?
    You appear to have decided on a multi-position switch rather than a flip-flop solution.
    4017's will work down to 3V as will many cmos chips including 7555's.
    I think you need to show a schematic to really identify parts.
     
  19. athulascc

    Thread Starter Member

    Aug 15, 2014
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    1
    I have idea how to use 4017 with 7555 ic. I hope to use push button as pulse to 4017 and connect 4th output pin with reset.
    so 4017 count upto 3 with push button. so 1st stage is off, 2nd stage on, 3rd stage flash.
    I use 3rd pin to enable 7555 flash circuit.

    since I use 2*CR2032 batteries I am not sure it will function well when battery discharges.
    if I have mechanical switch thats great. but need push type.

    so what is your ideas?

    will circuit work upto 3V?
     
  20. pwdixon

    Member

    Oct 11, 2012
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    You are obviously way out of your depth, you need to learn some electronics before you try to take something into production in any way. Perhaps you should pay someone to design what you want rather than trying to do it yourself as there's a lot to think about when you create something to sell reliably. If you are really looking at large scale production you need low cost and reliable.
     
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