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
You can use the MAX7219 to do that. Details here: http://arduino.cc/playground/Main/LedControl
BulletMagnet83: You can use the MAX7219 to do that. Details here: http://arduino.cc/playground/Main/LedControl
But they never teach me how to setup.
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 ?
You need to understand what is happening when you multiplex a device. Read this:- http://www.thebox.myzen.co.uk/Workshop/LED_Matrix.html
hey, i include the uln2803. but i wan reduce the number of pins. that why i'm using 74hc595.
Fine, if you don’t want it to actually work then you can miss out the shift registers altogether.
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.