how to display 2 digit 7 segment?

Discussion in 'Homework Help' started by toyota8, Oct 28, 2008.

  1. toyota8

    Thread Starter New Member

    Oct 26, 2008
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    if given 2 single digit 7 segment display, how connect them to display 2 digits?
     
  2. veritas

    Active Member

    Feb 7, 2008
    167
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    The first thing will be to check the datasheet for the pinout and whether it's common-anode or common-cathode.

    Then you need to know how much the max. current for each LED, and you can go from there to determine if or what size of external resistor you will need for each LED.
     
  3. toyota8

    Thread Starter New Member

    Oct 26, 2008
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    0
    yup,thanks...now that i have fix the resistors, what should i do? connect it to a decoder or a mux?
     
  4. veritas

    Active Member

    Feb 7, 2008
    167
    0
    Yes, depending on the logic that you are trying to output... If you are trying to display a BCD value, you can use a decoder such as a 7447.
     
  5. toyota8

    Thread Starter New Member

    Oct 26, 2008
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    0
    ya,i would like 2 have tat... and have fixed tat in just now... so do i need 2 have a mutliplexer? and how 2 connect it 2 the mux?
     
  6. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    A multiplexer and a MUX are the same thing. You need two sources of BCD values to feed the decoders. Look at BCD counters.
     
  7. toyota8

    Thread Starter New Member

    Oct 26, 2008
    8
    0
    ya,how to connect the 7 segment 2 the mux? do u noe any sites or links tat hav a schematic diagram of how 2 connect the legs of 7 segment, decoders, and mux?
     
  8. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    Don't really need a schematic. Get the data sheets for the chips you are using and follow that information. The displays, whatever they are, will connect to the outputs of the display drivers, whatever they might be. The display drivers get their inputs from the MUX, whatever it might be. The MUX inputs have yet to be mentioned.
     
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