hi,pls i believe that i can go to an electronic shop or order online for a microcontroller after which i code it for a led display to display WELCOME TO ELECTRICAL ENGINEERING and it should scroll,or is there any other thing to do, like the type of microcontroller to buy, the specification,power ratings and others, pls put me thru to get started i ve got just little or no idea on this
thks
darlington

 

If you need not build this yourself you can use an LED Buckle from ebay
http://cgi.ebay.com/SHARP-BLUE-LIGHT...QQcmdZViewItem

Based on what I read from your post, if you have yet to buy any type of microcontroller, then I would say its better to learn how to use it first before taking on a "PROJECT".

 

How many LEDs in your display? Most microcontrollers don't have enough pins to directly drive more then a couple of letters. You'll need some additional chips to expand the output.

http://www.attiny.com/dotmatrix.htm

This site gives a pretty good explaination, and several circuits, code. At the top left is a button 'NEXT', will take you to the next page, with a bigger display, and so on...

 

Hi again, Darlo,
Is this the kind of thing you're trying to make?
http://images.google.ca/imgres?imgur...%3Den%26sa%3DN

Can you try to be more specific about exactly what you want, e.g. how big you want your display to be? Is there a specific function you want your display to serve (does it need to be big and waterproof, because it's going to be outside?) or is this more of an electronics exercise for you? Also, what's your level of training in electronics? Are you quite comfortable with soldering and assembling components, etc?

 

This site also contains how to do a basic scrolling message.

http://www.talkingelectronics.com/te...ive_index.html

Also Nigels Tutorial 13 have a nice part on that.

__________________
Gayan

My Website
http://gsmicro.blogspot.com/

 

These are just demos using a single 8x8 LED block connected a PIC, and can give you some ideas of the possibilities. You have to start somewhere. Code in Basic is available:

http://www.youtube.com/profile_videos?user=circuited

 

first go thru the links below:

http://www.play-hookey.com/digital/e...n_seg_led.html

http://en.wikipedia.org/wiki/Seven-segment_display

http://www.scienceprog.com/control-7...lays-with-avr/

after then u will b able to perform any operation with the 7- segment LED displays, also go through the datasheets of ICs like EDE707, MAX7219 / MAX7221, SAA1064, ICM7218, MC14499 etc....

Also, try this project, the files for hardware and software are in ZIP format:
http://www.woe.onlinehome.de/zip/ser_led.zip
For the hardware the freeware version of Eagle 3.55 is required. It is available for free from CadSoft.
Schematics:
http://www.woe.onlinehome.de/proj_gif/ser_led.gif

with regards,

__________________
- Muhammad Zubair Bhamani

 

http://www.youtube.com/watch?v=jWnUlMEH25M

You need micro controller with at least eleven I/O to drive eight rows, two pins for data shifting and shift register clocking and two pins (UART) for sending data to the display, here I use Nokia 3310 cell phone (FBUS) as message source.

 

Technically, you could drive the whole arrangment with 4 IO by using 74HC595's or equivalent. SHIFT (SCLK), DATA, and 2 STORE pins.

 

True, and that 4-pin SR-only subsystem could easily be driven by an 8 pin PIC but it ends up using the same number of ICs as a PIC+SR subsystem solution.

And let's not forget that a PIC+SR subsystem could provide a 1-pin or 2-pin Serial interface, 2-pin I2C interface, 3-pin SPI interface, or an IR interface for that 8 pin PIC project as well as full fade-to-black PWM brightness control, Clock/Calendar/Alarm/Timer functions, one-wire® bus (temperature sensors, RTC, ADC, etc.), fully debounced single-pin keypad matrix, switch press beep, ad infinitum.