Maker Pro
Maker Pro

About LED Sign Board

jeetverma

Jul 26, 2012
8
Joined
Jul 26, 2012
Messages
8
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...
 

Attachments

  • led-sign-board.jpg
    led-sign-board.jpg
    142.8 KB · Views: 3,778

GreenGiant

Feb 9, 2012
842
Joined
Feb 9, 2012
Messages
842
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?
 

GreenGiant

Feb 9, 2012
842
Joined
Feb 9, 2012
Messages
842
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.
 

BobK

Jan 5, 2010
7,682
Joined
Jan 5, 2010
Messages
7,682
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
 

jeetverma

Jul 26, 2012
8
Joined
Jul 26, 2012
Messages
8
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 ?
 

BobK

Jan 5, 2010
7,682
Joined
Jan 5, 2010
Messages
7,682
That will get you enough for 5 alphanumeric characters, not much of a signboard.

Bob
 

CocaCola

Apr 7, 2012
3,635
Joined
Apr 7, 2012
Messages
3,635
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 ?

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...
 

john monks

Mar 9, 2012
693
Joined
Mar 9, 2012
Messages
693
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.
 

KrisBlueNZ

Sadly passed away in 2015
Nov 28, 2011
8,393
Joined
Nov 28, 2011
Messages
8,393
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.
 
Top