DIY Moving Message Display

blueroomelectronics · Jul 30, 2007

circuit diagram of 48 x 8 led scrolling message

The 74HC154 would work well as the column driver (16)
The 74HC164 would work as the row driver (80)

You may be able to run the row without drivers at 10ma each with a 74ALS164 but you'll need PNP drivers possibly darlingtons on the columns.

NeoMatrix · Jul 30, 2007

moving message display system

hello blueroomelectronics

sorry u misunderstand that not 16 cols 80 rows actually that is 16 rows 80 columns
16x80

so far i am giving cols from 164 and rows directly from portb its working fine 8x32(8 rows and 32 cols) now i want to expand this with (16x80 16 rows 80 columns)

if u have any idea can u tell me plsss

thank u

Mike K8LH · Jul 30, 2007

moving message display with keyboard

NeoMatrix said:
so far i am giving cols from 164 and rows directly from portb its working fine 8x32(8 rows and 32 cols) now i want to expand this with (16x80 16 rows 80 columns)

if u have any idea can u tell me plsss

thank u

Neo,

Are you still using anode rows and cathode columns?

NeoMatrix · Jul 31, 2007

moving message sign project

yes

i putted 1 bc547 tr for cols to make cathode

auto2007 · Aug 1, 2007

how to make led moving message display

I up a file form web.

Tamnc · Aug 7, 2007

dawn simulator led diy

Hi All,
I'm new this forum's member. I have read much your posts and I'm very interesting on DIY moving message display.But I'm novice, please advise me some books guide to design led display especially giant outdoor led screen.I tried to search much times but found nothing.
Thankyou advance.

NeoMatrix · Aug 7, 2007

moving message sign circuit

hello tammc

i am also want to do the same to design moving message for 16x40 but not get any help from here

wyang · Aug 15, 2007

pic16f877 matrix 16x80

hi all....
do anyone have the moving message display schematic diagram and program that build up by PIC16F877 or any PIC µC...can post it up....pls.....
thanks..........

segmex · Aug 15, 2007

wireless moving message display circuit

thnks for the posts..

how we can move up-down then message .

sorry for my english

monterez · Aug 16, 2007

software download led moving message sign

agreed..
actually im doing this at the moment
but im using 16x2

Al Farouk said:
Dear saif
I think that I understand what you need. The idea os the design of the moving message as follows

The shape of the characters are saved in EPROM (for example) and the display matrix are arranged in row and columns each column can be enabled individually.

Counters are used to address the contents of the EPROM in synchrounous with the columns enabled sequence so the shape of the character can be drwan on the Matrix.

to show the moving effect, enable column n then n-1 then n-2 and display the output of the EPROM content on the appropreiat column, repeat this action for example 25 --> 50 time/second.

repeat the last setp by shifting the columns address i.e enable n+1 then n then n-1 and so on.

repeat the last step till the end of your dislay matrix, you get the moving effect.

regards

hermann_gustav · Sep 13, 2007

moving message display pcb +layout

I need something to Atmel AVR, I just find for PICs...

sohail_akram · Sep 13, 2007

pcat (ps2) keyboard with moving message

Here is my 8051 basd moving message circuit, codes & proteus design

**broken link removed**

another with pc controlled

**broken link removed**

OBIALOR · Sep 16, 2007

moving message sign software downloadable

Hello sohail_akram
i downloaded your sign project and the schematics of the one with 24c64 does not match your code or are you deveoping it ,and during stimulation it does not run smoothly what compiler did you use.

NeoMatrix · Sep 16, 2007

moving dot matrix display gif

Hello Akram

i downloaded ur project its good as i am developing the same led moving message 8x80 and 16x80 for start i am designing 8x80 using pic16f877a and 74hc595
can i use ur code in this if u have any info doing in pic16f877a pls can u tell me i am using mikroc and ccs c i am new

thank u very much

hdhdhd · Oct 4, 2007

pcb layout for moving message display crcuit

hi, everyone

I am new in edaboard. I searched all of the topic. I am interested in 8051 and C and I couldn't find any running good project. I want a project using 8051 with 7x20 led matrix. anyone help me please

regards

xorcise · Oct 4, 2007

7x16 ledmatrix

For many of you interested in 8x8 LED arrays which are readily available and easy to connect to a microcontroller, I have created a group of interesting video demos on YouTube using a single PIC:

https://www.youtube.com/profile_videos?user=circuited&p=r

You can see the source code for most of these demos here:

https://www.mikroe.com/forum/viewtopic.php?t=10513
https://www.mikroe.com/forum/viewtopic.php?t=11194

eugenesiew · Oct 8, 2007

microcontroller based scrolling message software

Anyone knows if i can implement a led dislpay using PIC controller which i can change the text if i wanted to without having to reprogram it? is it possible to implement? the examples i saw so far in the very first few page (quick glance, not thorough) didnt mention anything about it.

What i mean is that my controller will of course be connected to my PC, from my pc, i decide what i display on the LEDs. I can change the intended message from
my computer and the display led will change instantaneously.

This is to help in making announcement....

thanks!

NeoMatrix · Oct 8, 2007

multiplex led matrix 7x40

Hello eugenesiew

I am also trying to desing the same LED Moving message Displays so far i tried to do 8x24 Using PIC16F877A and 74HC595 ,ULN24C02 till now i am saving the data from usart to 24C02 EEProm

what i am looking is to develop the software through visual basic to sotre the fonts patterns then display on the led moving message this my idea

i seen many form in this site but none will be useful

so tried my self so far succeded hope i will get this work soon and i will post the schematics and source

i am using mikroc compiler

hope for the best

if u have any questions reply me of mail ishqboy2006@yahoo.com how much i know i will help u

thanks

xorcise · Oct 8, 2007

cd4094 tutorial cours

NeoMatrix said:
I am also trying to desing the same LED Moving message Displays so far i tried to do 8x24 Using PIC16F877A and 74HC595 ,ULN24C02 till now i am saving the data from usart to 24C02 EEProm

NeoMatrix, I see you are still floundering both logically and electrically. After all that help in the other forums, and for so long now... I am surprised that you haven't paid attention in these forums because I came across an Elektor Magazine article posted (like this very thread) with a circuit and code, just for someone like yourself who doesn't get it yet.

Don't overcomplicate a simple concept. The 16F877A has plenty of ROM to store all your fonts and custom characters. Depending on your configuration you can use font tables created for LCD's (HD44780) or GLCD's (KS0108). These can be found everywhere, with the GLCD configuration being the most resourceful as far as memory is concerned. You can also create your own characters with a free font creator of some sort. Simply call them as needed through USART and display them... with some sort of algorithm that fits your layout.

blueroomelectronics · Oct 8, 2007

cofmaker examples

I have to agree with xorcise, you need to have a grasp of driving such a large amount of LEDs. It's one thing to drive a small matrix of LEDs but quite another to drive 16x80 or 16x40
These are large power hungry displays, to get any brightness out of those LEDs you're going to have to drive them at about 50ma each. So a typical row of 80 will require 50ma x 80 LEDs = 4Amps of current. The PIC can neither sink or source this amount of current without drivers.

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