On this page, I will introduce the electronic signboard with PIC16F84A.
112 LEDs are used for message display and 50 LEDs are used for around.
Latch registers by CPLD are used for the display of the LEDs.
So, LEDs can be brightly lit up compared with "Signboard".
For the details of CPLD, refer to the following.
"7bits x 16rows Latch Register for Signboard"
"5bits LED Shifter for Signboard"

Hardware Circuit drawing Pattern drawing Circuit explanation Parts explanation Software

Control unit
Display unit