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hzeller / rpi-rgb-led-matrix

Controlling up to three chains of 64x64, 32x32, 16x32 or similar RGB LED displays using Raspberry Pi GPIO
GNU General Public License v2.0
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How to connect to HUB12? #254

Open Czajo opened 7 years ago

Czajo commented 7 years ago

Hi, I was red a lot of information about it, but I haven't any results. My HUB12: OE 1 2 A N 3 4 B N 5 6 F N 7 8 S N 9 10 L N 11 12 R N 13 14 F N 15 16 F

I have no idea how to connect this for my raspberry pi 2B. Anyone can help?

hzeller commented 7 years ago

You need to figure out what the letters on your connection diagram means. Also figure out if output enable is positive or negative - I heard that it is positive instead of negative in the Hub75, so you might need to invert that signal.

I suspect the letters mean A, B : address, like in Hub75 OE : output enable S : clock ? L : latch ? R : Red - the only color N : probably GND

In a first step, you can probably just manually invert the OE signal with an external invertert before changing the software. From there, you then have to figure out the mapping. With only A, B, this will be 1:4 multiplexing, so you can probably assume that this will have a multiple --led-chain long. After you have figured out the mapping where each LED shows up, you can write a Transformer that does that.

A little bit of investigating, as this library is originally meant for Hub75 panels, but the Hub12 is sufficiently close that it should be possible to get it to work. Good luck!

Czajo commented 7 years ago

Hi one more time. I bought inverter on chip number 7404 and revert OE signal, but my led matrix shine probably on the max power. My power suply shows overload (over 1A x multipler 2,5). Without inverter I showed the moving string but distorted (demo 2). I have a question: On my raspi-config I2C was disabled. I changed this to enable. Maybe there will be ok?

Merry Christmas!!! :)

prunella2017 commented 7 years ago

@Czajo , hi were you able to proceed further with OE pin challenge? I too have the same issue as none of my led glows....?

maitredede commented 7 years ago

Hi @Czajo Is your panel a Freetronics DMD ? The connector looks like yours. (see their pdf).

They provide a simple lib for arduino, a second version, and I have made a C# lib for Raspberry Pi on top of PiGPIO. I also built a driver that uses a drawing lib (so I don't have to code them myself).

It won't replace hzeller work, but it can provide you a start point for HUB12 panels.