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I'm trying to find the pinout for the following LED display: 7 segment, 4 digits, 30 pins. On the PCB is also lettering "FD-955AB" but there's no related with LED displays information in the internet.
Try to light up the segments using a 9V battery with something like a 680R in the positive lead. It will be a common cathode or anode but once you've found out which is the common it should be relatively easy to map out the segment pins.
I have a multi meter that have a "diode test" that will light up a LED. Using the meter try combinations.
The LED module has many pins. Why?
Some modules have a pin out like this:
>7 sires for the 7 segments. a,b,c,d,e,f,g and 4 wires one for each digit. 1,2,3,4 They are arranged in a matrix.
>You might have (a,b,c,d,e,f,g 1,2) AND (a,b,c,d,e,f,g 3,4)
>You almost have enough pins to have 1(a,b,c,d,e,f,g) 2(a,b,c,d,e,f,g) 3(a,b,c,d,e,f,g) 4(a,b,c,d,e,f,g)