Hardware & Yun

Details

Written by Sonny Yu

• Openwrt-sdk and Yun
• Hardware and Yun

Install the HID driver we needed:

opkg update 
opkg install kmod-usb-hid
...
Configuring kmod-input-core.
Configuring kmod-input-evdev.
Configuring kmod-hid.
Configuring kmod-usb-hid.
...

ls -l /dev/input/
crw-r--r--    1 root     root       13,  64 Jan  1  1970 event0
crw-r--r--    1 root     root       13,  65 Oct 18 06:27 event1

The barcode scanner is at "/dev/input/event1"

Now we need compile c program "barcode"

nano /mnt/sda1/barcode.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <linux/input.h>
#define KEY_PRESS 1
#define KEY_KEEPING_PRESSED 2
int main (int argc, char *argv[])
{
struct input_event ev[64];
int fd, rd,size = sizeof (struct input_event);
char name[256] = "Unknown",i;
char *device = NULL;
char decode_scancode[]={0,0,1,2,3,4,5,6,7,8,9,0};
if (argv[1] == NULL){
printf("Please enter path to device\n");
return 1;
}
if ((getuid ()) != 0)
printf ("You must be as root for correct work!\n");
if (argc > 1)
device = argv[1];
if ((fd = open (device, O_RDONLY)) == -1){
printf ("Open error of device %s\n", device);
return 1;
}
ioctl (fd, EVIOCGNAME (sizeof (name)), name);
printf ("Reading From : %s (%s)\n", device, name);
while (1){
if ((rd = read (fd, ev, size * 64)) < size){
perror ("Read error");
return 1;
}
for (i=0; i< ((int)(rd/size)); i++) {
if (ev[i].type == EV_KEY) {
if ((ev[i].value == KEY_PRESS) || (ev[i].value == KEY_KEEPING_PRESSED)) {
if (ev[i].code < 12) {
printf ("%d", (decode_scancode[ev[i].code]));
}
else if (ev[i].code == 28) {
printf ("\n");
}
}
}
}
}
return 0;
}

gcc -o barcode barcode.c

barcode excutable for Yun:

https://www.dropbox.com/s/1a2860gei4ugiqk/barcode?dl=0

/mnt/sda1/barcode  /dev/input/event1
Reading From : /dev/input/event1 (WIT Electron Company WIT 122-UFS V2.03)
8901260131579638577
610214633880
000000610214633880
357510050163655
610214633880
^C

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Details

Written by Sonny Yu

• Hardware and Yun

lsusb
...
Bus 001 Device 005: ID 0922:8000 Dymo-CoStar Corp.

This confirms OS know USB port.

Install the HID driver we needed:

opkg update 
opkg install kmod-usb-hid
...
Configuring kmod-input-core.
Configuring kmod-input-evdev.
Configuring kmod-hid.
Configuring kmod-usb-hid.
...

cat /dev/usb/hiddev0  | hexdump
0001c50 008d 0073 0000 0000 008d 0074 0000 0001
0001c60 008d 0041 ffff ffff 008d 0040 0000 0039

0039 in Hex is 57 in DEC, my Iphone weight 5.7 Oz.

cd /mnt/sda1
wget https://www.dropbox.com/s/uwy1d0lgawljf3b/evdev.py --no-check-certificate
chmod 755 evdev.py
./evdev.py '/dev/usb/hiddev0'
...
<Event timestamp=9244935.9672950006 type=141 code=64 value=57>
...

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Details

Written by Sonny Yu

• Hardware and Yun

USB controlled relay board with 2 channels is used the HID technology.

https://github.com/sonnyyu/UsbRelay

Specification:

Relay type: 5V relay Contack type: NC / COM / NO (250VAC/125VAC/30VDC, 10A)

Input voltage: DC 5V (USB)

How to Cross Compile for Arduino Yun/Openwrt

A tool to control a USBRelay2 board. These boards are based on the V-USB stack from http://www.obdev.at.

Notes:

If you get a message usb.h file missing, you have to install this library:

sudo apt-get install libusb-dev

If you get following message:

./usbrelay get
Warning: cannot query manufacturer for device: error sending control message: Operation not permitted error finding USBRelay2: Communication error with device

Then you had to add sudo in front of the command:

sudo ./usbrelay get

1: ON
2: ON

./usbrelay -h
help: ./usbrelay on|off [1|2|3|4] [-n |all] [-name ] [-h]
-h|--helpprint this help
on|off [1|2|3|4]switch specified relay output on/off

getget relay status
-n |alluse specified relay (if there are more than one relay)
-name use relay with name, default is "USBRelay2"

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