Now I want to use the 4 digit display, but it has 12 pins, and everything I find online is either 16 pins or 10 pins...
I did a quick search for led 4 digit and then clicked on two different displays that resembled yours. Each came up with a link to a datasheet and both datasheets had the same pinout.
PIN FUNCTION
1 E
2 D
3 DP
4 C
5 G
6 DIGIT 4 COMMON A/C
7 B
8 DIGIT 3 COMMON A/C
9 DIGIT 2 COMMON A/C
10 F
11 A
12 DIGIT 1 COMMON A/C
Don