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2021-03-02 6:36 pm
Greetings,
I started a project using, what I thought, were a pair of similar 8x8 LED matrix arrays. I wrote the code after manually testing with one of them. Turns out the pin assignments did not match!
So I spent some time looking at each array.. they both have the same number DG-D03883, but then non-identical numbers after. I found the parts listing that came with my first Arduino kit and it listed the array as 1588BS. Turns out that's not the one I tested with.
What could have been a few hours of coding and testing turned into 2 days of "what the". 🤔
Great learning experience, but in the end I need to order 5 more of these.
Do I have to test each one to identify PIN assignments?
As always, help is appreciated.
2021-05-11 3:45 am
If you order all of them from the same supplier than you are *almost* assured they are all the same pinout. I got caught in the same problem, wasted many hours with that one. I know your pain.
tinkerman reacted
2021-05-11 12:27 pm
Do I have to test each one to identify PIN assignments?
Perhaps it's not a bad idea, despite how it will take up some of your time. In this situation, it might have saved you some time in the long run. You could do it with a multimeter on the "diode" function, which usually has enough voltage to light the segments.
But I agree, it's a lot of pins to test!
Not sure if this article on Components 101 is of any help.
😎
Bill
"Never trust a computer you can’t throw out a window." — Steve Wozniak
tinkerman reacted
