Test circuitry on a breadboard. It works.
This uses a PIC, a CMOS4067, common cathode 7-Segment displays and 8 resistors.
It can control up to 16 7-Segment displays without additional hardware/software.
cardboard display holder for demonstration and testing purposes
here all 16 displays hooked up, 2nd PIC for communication w/ PC
all on the breadboard, with the displays stuck in a piece of cardboard to hold them
behind the cardboard... you can see solder side of the displays
another angle, closeup
yet another angle
the solder spool is used here to keep the U-shaped cardboard from falling over
overallview of the breadboard
the communications PIC with a MAX232 and its capacitors
the display PIC and the 4067 (note: the PIC is the smaller one :-)
ditto
overall breadboard, this time a sharper image
front of the cardboard
all displays run in time-multiplex.
ie. each is lighted up for a few msec, then the next.
this keeps the component count down :)
closeup
one of the display units w/o the cardboard
the back of the same, with the solder side
