Matrix led design help - Electronic Circuits Projects Diagrams Free

pic2006 · 22nd October 2009, 07:23 PM

Hi all ,
I am new to this forum , first I would like to thank everyone here who share his knowledge.

My next project is designing 24 character scrolling led matrix display ( I would use 8x8 led matrix modules for one character so I need 24 of them ) , I have looked through the forum to understand the logic of scrolling displays I could understand that it is better to scan the rows , to get higher duty cycle. My display should receive the characters from PC through RS232 up to 100 characters as one sentence to be displayed . My problem is I could not understand the logic of scanning and generating the specail data to scroll the sentence from right to left or from left to right or even for short sentences to be fixed . should I need external memory for this or not ? I would be thankfull if someone could explain those issues please ?

I would like to use one of the 18F series PICs .

Thank you in advance

Regards

pic2006 · 23rd October 2009, 08:07 AM

anyone , please ?

Gayan Soyza · 23rd October 2009, 03:26 PM

Adding custom messages make the design complex.Better start with basic scrolling & how to do a multiplex & how to cascade them.

Search in the micro controller section for signboards.

pic2006 · 23rd October 2009, 03:45 PM

Thank you
I have no problem with hardware ( multiplex & how to cascade ) , my problem is undertsnading how to generate the data that I would multiplex , knowing that the charachters would change according to the commands from the PC .

thank you

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22nd October 2009, 07:23 PM	#1
pic2006	Matrix led design help Hi all , I am new to this forum , first I would like to thank everyone here who share his knowledge. My next project is designing 24 character scrolling led matrix display ( I would use 8x8 led matrix modules for one character so I need 24 of them ) , I have looked through the forum to understand the logic of scrolling displays I could understand that it is better to scan the rows , to get higher duty cycle. My display should receive the characters from PC through RS232 up to 100 characters as one sentence to be displayed . My problem is I could not understand the logic of scanning and generating the specail data to scroll the sentence from right to left or from left to right or even for short sentences to be fixed . should I need external memory for this or not ? I would be thankfull if someone could explain those issues please ? I would like to use one of the 18F series PICs . Thank you in advance Regards

23rd October 2009, 03:26 PM	#3
Gayan Soyza	Adding custom messages make the design complex.Better start with basic scrolling & how to do a multiplex & how to cascade them. Search in the micro controller section for signboards. __________________ Gayan My Website http://gsmicro.blogspot.com/

23rd October 2009, 03:45 PM	#4
pic2006	Thank you I have no problem with hardware ( multiplex & how to cascade ) , my problem is undertsnading how to generate the data that I would multiplex , knowing that the charachters would change according to the commands from the PC . thank you