Raspberry Pi PC Remote Control

 

 

 

I'll show you how to Remote control USB Web Relays

 

 

Needed 

1 RaspberryPI
1 PC Remote
1 USB relay
1 USB cable
recommend install Raspbian

 

 

 

 

 

C code : kbd.c

 

#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <linux/input.h>
#include <string.h>
#include <stdio.h>
 
static const char *const evval[3] = {
    "RELEASED",
    "PRESSED ",
    "REPEATED"
};
 
char inData[4] = {0,0,0,0}; //Input Buffer
char *ptr;
 
int main(void)
{
    const char *dev = "/dev/input/event0";
    struct input_event ev;
    ssize_t n;
    int fd;
    ptr = &inData[0];
 
    fd = open(dev, O_RDONLY);
    if (fd == -1) {
        fprintf(stderr, "Cannot open %s: %s.\n", dev, strerror(errno));
        return EXIT_FAILURE;
    }
 
while (1) {
        n = read(fd, &ev, sizeof ev);
        if (n == (ssize_t)-1) {
            if (errno == EINTR)
                continue;
            else
                break;
        } else
        if (n != sizeof ev) {
            errno = EIO;
            break;
        }
  if (ev.type == EV_KEY && ev.value >= 0 && ev.value <= 2)
           // printf("%s 0x%04x (%d)\n", evval[ev.value], (int)ev.code, (int)ev.code);
            if(ev.value == 1){//Pressed
if(ev.code == 163){// >| key
popen("exec /home/pi/pcremote/./on.sh","r");
        }
else if(ev.code == 165){// |< key
popen("exec /home/pi/pcremote/./off.sh","r");
}
else{}
   }
    }
    fflush(stdout);
    fprintf(stderr, "%s.\n", strerror(errno));
    return EXIT_FAILURE;
}
 

 

 
 
 
 
File : on.sh
 
#!/bin/bash
# sends on signal to the USB relay
echo -e "\xFF\x01\x01" > /dev/ttyUSB0
 
 
File: off.sh
 
#!/bin/bash
# sends on signal to the USB relay
echo -e "\xFF\x01\x00" > /dev/ttyUSB0
 
 
 
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