Connect with us

4 x 7 segment common anode

Reply to Thread

Discussion in 'Microcontrollers, Programming and IoT' started by Rajinder, Apr 9, 2019.

  1. Apr 9, 2019 #1
    Rajinder

    Rajinder

    419
    7
    Jan 30, 2016
    Hi
    I have a 4 x 7 segment common anode display, which i will be driving from a PIC micro.
    I need some help in calculating resistor values and selecting the correct PNP transistors.
    Can anyone help?
    Thanks in advance.
     
  2. Apr 9, 2019 #2
    Harald Kapp

    Harald Kapp Moderator Moderator

    9,414
    1,925
    Nov 17, 2011
    Rajinder likes this.
  3. Apr 9, 2019 #3
    Rajinder

    Rajinder

    419
    7
    Jan 30, 2016
  4. Apr 9, 2019 #4
    Rajinder

    Rajinder

    419
    7
    Jan 30, 2016
    Are there any considerations required for the transistors? Also if i light up segments to say display the number '8'. Do i calculate each segments current to get the overall current?
     
  5. Apr 9, 2019 #5
    Harald Kapp

    Harald Kapp Moderator Moderator

    9,414
    1,925
    Nov 17, 2011
    The transistors are used in on/off operation only. You need to match max. current and voltage, that's more or less all.
    Each transistor drives one segment only.
    The total current (per complete display) is relevant for the power supply.
    Plus you'll have to consider total current (per digit) when multiplexing the display for the transistors (per digit) that drive the common anode of each digit.

    See for example here. Post your own schematic for us to cross-check.
     
    Rajinder likes this.
  6. Jul 20, 2019 #6
    Mark2019

    Mark2019

    14
    4
    Jul 7, 2019
    Rajinder likes this.
  7. Jul 20, 2019 #7
    Rajinder

    Rajinder

    419
    7
    Jan 30, 2016
    Thankyou.
     
Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Similar Threads

  1. 7 segment LED

  2. lighting a 7 segment LED

  3. how to repair 7 segment indicator

  4. 7-segment display numbers not in order.

  5. 2 x 16 lcd 4 bit mode

  6. Creating a 12x3 digit 7-segment display with Arduino

  7. Need help with using decimals on a 7 segment display

  8. USB and windows 7 architecture

Loading...
Electronics Point Logo
Continue to site
Quote of the day

“”

-