Got hold of three radio controlled wall outlets on sale. Modified the remote to be able to control the outlets with a pc parallel port (or some other port compatible with a 74xxx05)
The remote contains a sc2262 and is powered by a 12V battery.
After a look under the hood of the remote the conclusion was made that a press of a button connect two pins to ground, totally 5 pins are used giving six buttons (see schematic).
To control this from a computer a 74LS05 (hex inverter with open collector outputs) was used (any 7405 should do but if it's going to be powered by the parallel port it won't hurt using a low power one), connecting the open collector outputs directly to the control chip. The 7405 is powered using bit 5,6 and 7 of the data port, this is enough using the parallel port on my motherboard.
Schematic:
inside (the white wire is the antenna)
To control the parallel port this small (linux) program is used, ppdev module has to be loaded.
Remote.c
//Control of remote to remote controlled wall outlets using the parallel port
//Written for linux
//Written by Mikael Ågren 2009
//
//gcc remote.c -o remote
#include <stdlib.h>
#include <stdio.h>
#include <sys/io.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <linux/ppdev.h>
#include <fcntl.h>
int fd;
//map bits of pp data port
#define PWR (1<<7)|(1<<6)|(1<<5) //used to power buffer
#define ROD 1<<0
#define LILA 1<<1
#define GUL 1<<2
#define VIT 1<<3
#define SVART 1<<4
#define ON ROD
#define OFF LILA
#define ONE GUL
#define TWO VIT
#define THREE SVART
unsigned char setParPortData(unsigned char data) {
ioctl(fd, PPDATADIR, 0);
if(ioctl(fd, PPWDATA, &data)) {
printf("error writing to port");
exit(2);
}
}
delay_enough() {
char i;
for(i=0; i<5; i++) {
delay_1s();
}
}
delay_1s() {
time_t t;
time_t old_t;
old_t = time(NULL);
while ((t=time(NULL)) < old_t+1) {
}
}
void printHelp(char **argv, int exitcode) {
printf("usage: %s reciever on|off\nreciever = 1, 2 or 3\n", argv[0]);
exit(exitcode);
}
int main(int argc, char **argv)
{
if(argc!=3) {
printHelp(argv, 1);
}
printf("Försöker öppna /dev/parport0\n");
fd = open("/dev/parport0", O_RDONLY);
if(ioctl(fd, PPCLAIM)) {
perror ("PPCLAIM");
close(fd);
return 1;
}
printf("/dev/parport0 öppnad\n");
unsigned char out=0;
//which reciever
if(!strcmp(argv[1], "1"))
out |= ONE;
else if(!strcmp(argv[1], "2"))
out |= TWO;
else if(!strcmp(argv[1], "3"))
out |= THREE;
else
printHelp(argv, 1);
//which state
if(!strcmp(argv[2], "on"))
out |= ON;
else if(!strcmp(argv[2], "off"))
out |= OFF;
else
printHelp(argv, 1);
//keep buffer powered
out |= PWR;
printf("%x\n", PWR);
setParPortData(PWR);
delay_enough();
printf("%x\n", out);
setParPortData(out);
delay_enough();
printf("%x\n", 0);
setParPortData(0);
close(fd);
return 0;
}
Coffee...
Wrote some simple scripts so i can wake up to the smell and sound of fresh coffee in the morning
kaffeON
remote 3 on
kaffeOFF
remote 3 off
kaffe
if [ "$1" = "" ];
then
echo "usage: $0 now"
echo " $0 HH:MM"
exit -1
fi
timeoff=$(date -d "$1 30 min" +%H:%M)
$(echo kaffeOFF | at $timeoff)
if [ "$1" = "now" ];
then
void=$(kaffeON)
echo $void
else
timeon="$1"
$(echo kaffeON | at $timeon)
fi
