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i want to make LED screen display using led matrix 5*7 , i search for led matrix library but i can't found it , i need to make led screen like this ( http://www.electronics123.com/Programmable-5-x-7-Modular-LED-Matrix-Display.html ) without computer software interface ,
 i only need to show any const or variable  in the program like in the lcd display ( lcd.print("Hello world")
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Did you want to program an Arduino to drive those particular 5x7 display modules or did you want to design your own 5x7 display modules?

Form the datasheet (http://www.electronics123.net/amazon/datasheet/MLD1_datasheet_v1.pdf) it looks like they are sing the SPI hardware to shift data out very quickly.  For each line of each module you shift out two bytes: one to select which column and one to light the rows in that column.
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Did you want to program an Arduino to drive those particular 5x7 display modules or did you want to design your own 5x7 display modules?

Form the datasheet (http://www.electronics123.net/amazon/datasheet/MLD1_datasheet_v1.pdf) it looks like they are sing the SPI hardware to shift data out very quickly.  For each line of each module you shift out two bytes: one to select which column and one to light the rows in that column.
i want to design my own 5x7 display modules
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You can use this library to drive your matrix:

http://www.elcojacobs.com/shiftpwm/

I would make the 5 columns anodes and the 7 rows cathodes.  Then put a single shift register on each module to drive the 5 anodes.  The Arduino can then use seven NPN transistors to sink each row.
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