Connect with us

About LED Sign Board

Discussion in 'LEDs and Optoelectronics' started by jeetverma, Aug 31, 2012.

  1. jeetverma

    jeetverma

    8
    0
    Jul 26, 2012
    I want to know about LED Board.....
    which type of LEDs can be used in LED Sign Board ?
    1.7 v or 3 v

    Thanks...
     

    Attached Files:

  2. GreenGiant

    GreenGiant

    830
    6
    Feb 9, 2012
    you can use either, or both, or 12v, 24, etc

    its all about what you want to control it with, using lower voltage LED's will use less power overall, but most likely wont be as bright

    Do you want it to change or just turn on and turn off?
     
  3. jeetverma

    jeetverma

    8
    0
    Jul 26, 2012
    ya i want it Turn on and turn off...in different ways
     
  4. GreenGiant

    GreenGiant

    830
    6
    Feb 9, 2012
    In that case you are going to need a controller of some sort (microcontroller most likely) they typically operate at either 3.3 or 5V so you would probably want one of those, BUT you are going to need a large source to drive the LED's because you wont be able to drive all of them with just the microcontroller.

    I would suggest using transistors or relays to get this done.
     
  5. BobK

    BobK

    7,626
    1,654
    Jan 5, 2010
    The forward voltage of LEDS is mostly determined by their color. Red are typically around 2V and blue, green and white typically around 3.6V.

    Bob
     
  6. jeetverma

    jeetverma

    8
    0
    Jul 26, 2012
    i have 12V computer SMPS.....and i want to use 700 LEDs of different colors (Red, Blue, Green). in sign board...so how can i manege all LEDs ?
     
  7. BobK

    BobK

    7,626
    1,654
    Jan 5, 2010
    That will get you enough for 5 alphanumeric characters, not much of a signboard.

    Bob
     
  8. CocaCola

    CocaCola

    3,635
    4
    Apr 7, 2012
    Serial control from a micro or pc using serial LED driver chips... The Maxim MAX7219, MAX7221 are some examples (each one will control 64 LEDs), there are many others from other manufactures as well that will control varying numbers of LEDs...
     
  9. john monks

    john monks

    693
    1
    Mar 9, 2012
    Generally the shorter the optical wavelength of an LED is the more voltage it takes to drive it. For example:
    a red LED is around 1.6 volts.
    a blue LED is around 3.6 volts.
     
  10. KrisBlueNZ

    KrisBlueNZ Sadly passed away in 2015

    8,393
    1,266
    Nov 28, 2011
    Have a good look at this explanation:

    https://www.electronicspoint.com/got-question-driving-leds-another-work-progress-t228474.html

    That tells you about LEDs and how to drive them.

    I assume you want to make an animated, multi-colour sign board. This requires multiple LED drivers, like a MAX7219 or similar, or an array of transistors. Often LEDs in grids are multiplexed - google "multiplex leds" to find out more. You will need some kind of program to control them all.

    If you want any really useful answers, tell us all about what you want to do, and what experience you have.
     
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.
Electronics Point Logo
Continue to site
Quote of the day

-