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Posted 12-07-2011 at 09:45 AM by peonuser
Updated 12-09-2011 at 11:29 PM by peonuser

Basic circuit.

C code to turn pins on and off parallelport light controller. of course the compiled code will called from a bash script.

* Simple parallel port output control program for Linux
* Written and copyright by Tomi Engdahl 1998
* (e-mail:
* The program output the data value to PC parallel port data pins
* (default lpt1 I/O address 0x378). The data values are given as the
* command line parameter to the program. The number can be
* in decimal (0..255) or hexadecimal format (0x00..0xFF).

#include <stdio.h>
#include </usr/include/stdlib.h>
#include <unistd.h>
#include <sys/io.h>

#define base 0x378 /* printer port base address */

main(int argc, char **argv)
int value;

if (argc!=2)
fprintf(stderr, "Error: Wrong number of arguments. This program needs one argument which is number between 0 and 255.\n"), exit(1);
if (sscanf(argv[1],"%i",&value)!=1)
fprintf(stderr, "Error: Parameter is not a number.\n"), exit(1);
if ((value<0) || (value>255))
fprintf(stderr, "Error: Invalid numeric value. The parameter number must be between 0 and 255\n"), exit(1);
if (ioperm(base,1,1))
fprintf(stderr, "Error: Couldn't get the port at %x\n", base), exit(1);

outb((unsigned char)value, base);
#Simple bash script
let nodf=255
declare -i X=$nodf
while true; do
NUM=$[ ( $RANDOM % $X ) + 1 ]
lptout $num
# timing loop here.
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