need help in 8 bit moving message display using Matrix LEDs

[jon.leaves]

Hi to everyone... I am new here...

I am working on "8 bit moving message display using Matrix LEDs"

I am just making a prototype.

Please guide me for this circuit....

Thanks in advance.

 

[rushi53]

Have you worked on circuit diagram ?

I have implemented this project.
I have used 89s51 microcontroller. Made a character of 5x7matrix.

U can find more info here:
www.projectsof8051.com/projects/06-rolling-display-using-matrix-leds.html

Used Latch IC for each row. Used 3:8 or 4:16 decoder ic.

 

[jon.leaves]

Have you worked on circuit diagram ?

I have implemented this project.
I have used 89s51 microcontroller. Made a character of 5x7matrix.
Used Latch IC for each row. Used 3:8 or 4:16 decoder ic.

I have not yet finalized the circuit diagram... I am not familiar with microcontroller programming... Can you tell me if this circuit is cost effective. and have u done programming in C or assembly... because I am very poor in C language.

 

[rushi53]

I have used 89s51 microcontroller and have done programming in assembly language.

 

[jon.leaves]

How many characters have you designed? I mean 5x7 matrix belongs to 1 character...
Thus how many matrices are there ?
and whats the use of Latch and decoder ICs ?

 

[rushi53]

How many characters have you designed? I mean 5x7 matrix belongs to 1 character...
Thus how many matrices are there ?
and whats the use of Latch and decoder ICs ?

Decoder IC is used to select 1 column of Matrix LED.
and Latch IC is used to hold the data at each column.
I have used 2 ports for decoders and 2 decoders at each port
thus total 4 decoders
each decoder have 8 outputs
thus total 32 outputs from decoder
and each character requires 5 columns,
thus I was able to use 6 characters.

you can use 4:16 decoder, if you want to use more characters.
Thus u can increase columns.

 

[jon.leaves]

@rushi53,

thanks for the information
I can now start working on the circuit diagram...

can you tell me what is the programming logic in this
I mean algorithm/flowchart?

 

[powerpisces]

i need some help to drive dot matrix with out using micro controller.

i need some help to drive led dot matrix without using micro controller. i have designed a digital clock circuit on 7 segment, now i want to implement it now matrix. plz help me. i m 2nd year student so i haven't any brief idea about micro controller and i must implement my circuit on led matrix.