I am trying to build this clock,
But im using a 74x74 led matrix from a surplus.
The issue here is some difference in the connector, pin E does not exist on my led matrix. Looking for advice how to interprete this. The 1st photo is the project, the 2nd photo is my surplus matrix..the difference is i don't have E pin on it.
Are you certain your panel uses the same code?
My question about input pins compatibility. Code is the same.
Where does the code reference "E" and what is its purpose? Could your panel not have an "E" because it is hard-wired? Looks like pin 15 on the nodemcu.
Gee thanks xfpd, i will post detailed pics of my LED panel this evening. Hope to get something
The number of address pins (A B C D E) depends of panel resolution (W x H in pixels) and scan factor.
Please show a clear photo of the panel rear side with readable views of all labels
Your photos are very blurry and not much is visible. However, the photo of the connector clearly shows that this is not a hub75 standard panel, as used in the clock project.
Thank you.
What is the pixel dimensions of the panel? According to the number of drivers it hardly can be a 74x74... It looks like 72x72 or less.
You're absolutely right 72x72 LEDs...the total panel size 285x285mm.. i think there should be a way to use it in this tetris clock or the morphing clock..that's why i posted here asking for help because i got 4 of these panels waiting to be utilized.
Unfortunately, I have to disappoint you.
Your panel is not a hub75 standard, and none of the existing Arduino libraries will work with it.
I've been working with similar panels for a long time and understand how the code needs to be redesigned - but if these panels were mine, I wouldn't bother. This is a lot of work even for one who has an experience and 4 panels are clearly not worth taking on. Buy standard panels from Adafruit or on Aliexpress - 4 HUB75 panels with similar size will cost you no more than $100.
This was post #2 and #3... 10 posts and two days later. Here we are.
You can return the panel from where you took it.
@xfpd
You are not quite right, the #12 does not follow directly from #2 & #3. We spent two days to clear the things.
Of course there is a way to talk to the board. Of course programs have been written for using it. I would look forward to watching this panel take comms and "blink without delay" but it is not on your work bench. In this case, I called it right. Return it to the owner.
Whats a bottleneck, this was a no return sale, ....got meself stuck with 4 of these 
I think these are outdated panels from some warehouse, as far as I can see they have the 2014 date on them.
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