Self-made, 4×4 LED matrix which connects to LPT port and demonstrates a scrolling ‘HELLO WORLD’ sign, under openbsd 4.2. To enable access to I/O ports on openbsd, use the i386_set_ioperm(2) or i386_iopl(2) system calls. To read/write ports, use C wrappers for IN and OUT machine instructions from the /usr/include/i386/pio.h header file. Components used: leds, resistors, standard logic ics (7404, 74373). Photos and source code for the demo program: s010.lv
Tags: matrix, OpenBSD, port, under
Categories: OpenBSD
That reminds me of he one I built bak 6 years ago! It was directly driven by the Port (no ICs) and 5 NPN-transistors
SWEET!!!
Just be prepared for a lot of work that requires a lot of patience =)
I have a plan to make a 8×40 Dot matrix driver
which connects to LPT port.since this device contains a few electronical components and 7 cheap ICs(all of them spends arround 10$),I wonder this job is efficient or not?