count up with push button.need help

Discussion in 'The Projects Forum' started by cabsbri, Jun 23, 2013.

  1. cabsbri

    Thread Starter New Member

    Jun 23, 2013
    3
    0
    good day..i would like to ask if how can i make a count up counter with 1 oush button?i need it to make like a priority number of my mini store..and what are the best parts and ic to use...im planning to use a led for its display..thank you
     
  2. elec_mech

    Senior Member

    Nov 12, 2008
    1,513
    193
    Welcome to AAC. Are you wanting to display a number or simply light up a row of LEDs (one at a time in order)?

    If you want to display a number, what is largest number you want to display, e.g., 0-9, 00-99, etc.?

    If you could post a picture or a link to something similar we can better help you.
     
  3. MrChips

    Moderator

    Oct 2, 2009
    12,449
    3,365
    A customer comes into the store and takes a number. The current customer being served is displayed on a large LED counter showing a number from 00-99.

    Very doable and a great little project for anyone with little or no experience in electronics.

    There are a number of approaches of which I will outline three possibilities:

    1) Classic solution using 0-9 counter, 7-segment decoder/driver, 7 resistors, 7-segment LED display.
    You will need to double the parts for 00-99 display.

    http://www.aaroncake.net/circuits/counter.asp?showcomments=all

    2) You can find single chip solutions such as SN74143 and CD4026. You will need two of this.

    http://forum.allaboutcircuits.com/newsgroups/viewtopic.php?t=10671


    3) You can program a microcontroller chip to create a single chip solution. You can have up to four digits with the single chip.

    http://forum.allaboutcircuits.com/blog.php?b=559


    With options (1) and (2) you will need to create a switch debounce circuit otherwise the counter will skip some counts when the push-button is pressed.
     
  4. Dodgydave

    Distinguished Member

    Jun 22, 2012
    4,999
    745
    You could get a cheap calculator and wire a switch in parallel with the + Key, programme the calculator to add 1, and every time the push button is pressed it counts up one!
     
  5. MrChips

    Moderator

    Oct 2, 2009
    12,449
    3,365
    Yes, I have done that too for a portable radiation counter in the '70s.
     
  6. cabsbri

    Thread Starter New Member

    Jun 23, 2013
    3
    0
    this is absolutely what i wat..thank you very much..i figure out how to make it.. i use 555 timer ic to make an pulse input...bec. push button wont work...
     
  7. elec_mech

    Senior Member

    Nov 12, 2008
    1,513
    193
    A push button can work, but it needs to be debounced. A 555 can do this or a Schmitt gate IC with a resistor and capacitor. Sometimes you can get away with just a cap and resistor.

    You still haven't elaborated on what it is you're looking for. Is this a 1, 2, 3, 4, or more digit display?

    You can take a look at this post for some examples. A CD40110 will do the job nicely if you don't need to preset or reset the display to a specific value.
     
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