Hello everyone. Finally i have already completed my project.
A wireless counter with web access and database storage.

- 4 threads for counting
- Graph for the counting time
- nginx web access (PHP links to the local sqlite3 database)
- database using sqlite3
- sensor voltages are passed to the pi via a level shifter like board
  (Self made)
- ambient temperature almost 40 degrees, 2x 12cm 24V fan is used.

Sensor used :
[attachmentid=3240517]

The board to get readings :
[attachmentid=3240519]

The whole device : (pi inside, 4A psu, sensor board)
[attachmentid=3240518]

Terminal program to read data and safe to database :
[attachmentid=3240524]

Web output :
[attachmentid=3240525]

To view saved data :
[attachmentid=3240526]

well, we have huge number of fixed object moving on 4 different track but in 1 single line,
so the objective was to count the number of object moving across the sensors
as well to detect how many are broken in 1 complete round.

You can classify it as a normal electronic counter.
So, instead of pulling up long wires or long hdmi cable..
an internal web server and database server(sqlite3) will be running.
The raspberry pi will be connecting to a nearby router via a wireless adapter (edimax).

Any devices with access to the router and with web browser can view the web output.
Its an cheap wireless counter.