4x4 LED matrix for LPT port under OpenBSD 4.2

Self-made, 4x4 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).

Source code for the demo program: https://github.com/S010/misc/tree/master/4x4_led_matrix

Category:

Science & Technology

Tags:

• led
• matrix
• lpt
• programming
• openbsd
• unix
• diy
• electronics
• digital
• display
• leds
• project

[LunaVorax]

Great stuffs !

I would have loved to donwload the source code of this but the link appears to be dead. Do you still have it around ?

[0x1392]

@LunaVorax Hi, sorry for such a long delay. I updated the video information to include a working link to the source code.

[LunaVorax]

@0x1392 No problem for the delay :)

Thank you so very much and have a Merry Christmas ;)

[0x1392]

@LunaVorax Thanks, Merry Christmas!

[mardeh7732]

I have a plan to make a 8x40 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?

[0x1392]

Just be prepared for a lot of work that requires a lot of patience =)

[nrdesign1991]

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 :)

[chngngsldr54]

SWEET!!!