I got myself a Bi-Color (Red and Green) Common Anode LED Matrix off eBay.
I've been trying to find a tutorial which shows me how to set up one of these Bi-Color Matrix's.
I've actually found some information showing how one of these LED Matrix's can be set up using the following:
- Arduino Uno
- 8 by 8 LED array (two colour)
- 16 100 Ohm resistors
- 4017 decade counter
- 8 2N7000
However, the tutorial doesn't actually state whether the LED Matrix should be Common Cathode or Common Anode. So it may not actually work.
I started off playing around with Seven Segment Displays using shift registers. I had 6 Seven Segment Displays which meant 6 shift registers and 40 resistors. And the fear (I got over it) of maxing out the available amps on my USB port.
Then I discovered the Max7219 chip. And I've become a huge fan.
In one swoop, I immediately substituted 6 shift registers and 40 resistors with one Max7219 chip and one resistor. And in the same swoop, because of the Max chips multiplexing capabilities, I no longer needed to worry about having enough amps to manage all of the LED segments that may be lit.
So, whilst I do have this tutorial to try and get my bi-color LED Matrix going, I would love to be able to find a tutorial which shows me how I can get it running using the Max 7219 chip. Well, two chips actually.
Online I've seen and heard about people getting a bi-color LED Matrix running with two Max 7219 chips. However, I haven't come across any tutorials which gives a newbie such as myself a simple step by step explanation of how to get it running.
Come to think of it, I think I read somewhere that the Max7219 chip can only handle Common Cathode LED Matrix's. So what I'm asking for may not even be possible. I'm afraid I ordered this matrix before I even knew that Matrix's came in Common Cathode and Common Anode varieties.
I would be eternally grateful if someone can direct me to a tutorial to set up this Bi-Color display, preferably using the Max 7219 chip. ANd also if someone can tell me how I can (if this can be done) "convert" my Common Anode LED Matrix to work in examples where a Common Cathode LED Matrix is being used. Like I said, I'm a newbie.
Thanks in advance