4 5x7 DOT MATRIX DISPLAY

Using Arduino LEDs and Multiplexing
1

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

2

You can use the MAX7219 to do that. Details here: Arduino Playground - LedControl

3

BulletMagnet83:
You can use the MAX7219 to do that. Details here: Arduino Playground - LedControl

But they never teach me how to setup.

4

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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5

You need to understand what is happening when you multiplex a device. Read this:-
http://www.thebox.myzen.co.uk/Workshop/LED_Matrix.html

6

hey, i include the uln2803. but i wan reduce the number of pins. that why i'm using 74hc595.

7

Fine, if you don't want it to actually work then you can miss out the shift registers altogether.

8

Nice tutorial with shift registers and current-limiting resistors at lucidtronix.com - lucidtronix Resources and Information.. They've got an Arduino library that can display string or set individual pixels.