Digital clock building
posted Dec 22nd 2008 2:50pm by Eliot Phillipsfiled under: daily, home hacks, led hacks, peripherals hacks
[punkky] has been documenting his adventures building digital clocks. They each use six 7-segment LED displays, but he’s been gradually changing how they are built. The first version used a CMOS BCD-to-7-sement latch on each display, which is tied to a PIC16F627a. For the next run, he added multiplexing, so he could drive all the segments using just thirteen pins. He’s posted a final schematic with code and details of how the clock timing actually works.
Pfft :P The PIC is cheating! We had to do it with 74xx logic and a 12VAC transformer alone!
Posted at 7:14 pm on Dec 22nd, 2008 by error404