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]