I will introduce the making of the electronic signboard which used PIC16F84A on thses pages.
112 LEDs(7 x 16) are used for the display of the message. 50 LEDs are used as the design of the edge.
Latch registers by CPLD are used for the display of the LEDs.
So, LEDs can be brightly lit up compared with "Signboard".
As for 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