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Author Topic: 4 5x7 DOT MATRIX DISPLAY  (Read 2003 times)
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Hi, guys.
I'm trying to do a project using four 5x7 led dot matrix display. How do i go about configuring the hardware? Do i need ULN2803 , 74HC595 shift register to program it? Can you guys give some links on how i should set up ? Thanks very much
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You can use the MAX7219 to do that. Details here: http://arduino.cc/playground/Main/LedControl
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You can use the MAX7219 to do that. Details here: http://arduino.cc/playground/Main/LedControl

But they never teach me how to setup.
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I try to connect all the column to 74hc595, what should i do with the rows? http://www.arduino.cc/en/Tutorial/ShiftOut say connect all to ground ?


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You need to understand what is happening when you multiplex a device. Read this:-
http://www.thebox.myzen.co.uk/Workshop/LED_Matrix.html
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hey, i include the uln2803. but i wan reduce the number of pins. that why i'm using 74hc595.
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Fine, if you don't want it to actually work then you can miss out the shift registers altogether.
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Nice tutorial with shift registers and current-limiting resistors at http://lucidtronix.com/tutorials/18.  They've got an Arduino library that can display string or set individual pixels.
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