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You are here: Home / Topics / 7 segment multiplexing

7 segment multiplexing

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Microcontroller › 8051 › 7 segment multiplexing

  • This topic has 3 replies, 4 voices, and was last updated 11 years, 2 months ago by AJISH ALFRED.
Viewing 4 posts - 1 through 4 (of 4 total)
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    Posts
  • March 3, 2014 at 5:06 pm #2917
    M Shuzub Gul
    Participant

    how to select a resistor to implement a 4 digit 7 segment COMMON ANODE led with 8051. what would be calculations for selecting resistor?

    March 3, 2014 at 5:37 pm #11181
    Ganesh Selvaraj
    Participant

    7 segment display is nothing but 7 LEDs arranged to form the display. So you just need a 330 Ohms resistor for each pin.

    March 4, 2014 at 5:25 pm #11197
    SHAH DISHANT H.
    Participant

    330 ohm or 470 ohm will be good enough.

     

     

    March 5, 2014 at 4:30 am #11201
    AJISH ALFRED
    Participant

    Hi,

    Use this equation, R = V / I;

    where V = supply voltage – 0.6

    and you can choose ‘I’ as per the brightness you need. More the value of ‘I’, more brighter the display will be. Normally the value of ‘I’ should be around 10mA.

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