The LED segment bit codes for '0' to '9' on a 7-segment numeric LED aren’t hard to calculate by hand.īut, figuring out 96 ASCII characters for a 14-segment alphanumeric LED is a job for an automated tool. Instead, store a const array with all of the segment bit values and have a subroutine look up each character to translate it when it is drawn on the display. It would be nasty to hardcode LED segment values in every string or number that you want to display. Instead, you must send 127 (which is 1111111 in bits) because the image of a number '8' requires all of the numeric LED segments be turned on. ![]() That is, you can’t simply send the numeric value 8 and expect to see a visual '8' symbol appear on a 7-segment numeric display. The bits sent to the Lite-On LTM-Y2K19JF-03 multifunction display control individual LED segments. 14-Segment Alphanumeric LED and ATtiny MicrocontrollerĪlthough this project refers to the All Electronics (CAT# DSY-1) multifunction LED display, the LED font is applicable to other alphanumeric displays as well.Īnd, the serial-to-parallel code created for the ST2225A should be fairly close to other similar devices, such as the PS035, PS045M, M5480, M5481, MM5480, and SDA2131-2.
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