Thinking of getting an Arduino later to complement the Pi when becoming more understand of it's capability.
Office? Later they will check why so many slow connection one. 

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]

yup..same with me..im doing some research now btw..hehe.
lol.hide your device la..they won;t know..just use battery pack..haha..fast connection.

hmm question..tried this raspberry and seems awesome but it could not detect my 2.5 WD pasport hdd...is it because of not enough power? it is 500gb size....

Sensor model : Photoelectric sensor 10-30V NPN

The code in C++ must have multiple threads so that it could detect simultaneously for high speed movements.

Yeah, totally wireless, But do note that wireless adapter could disconnect every now and then, for a total headless operation,

Create a script to detect whether wireless is connected and run that script in a screen multiplexing software like, "GNU Screen" or use crontab, scheduling software.

Yup, port forwarding will allow external access.

hmm question..tried this raspberry and seems awesome but it could not detect my 2.5 WD pasport hdd...is it because of not enough power? it is 500gb size....

maybe calling them would help..i lazy to order online..haha...i'd rather go to shop just to get it..the feeling of hunting..  

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.

regarding the wireless adapter would disconnect once a while.... do u manage to root cause the issue?
is it hardware? (wifi adapter/ wifi router), power surge? (i think u r using a battery pack?), software? (RPI is not that powerful, just adequate. or is ur code?), or location? (where u place the router/rpi box)?
how do u connect the RPI? direct into RPI usb slot?
if u direct into RPI slot, u might wanna try to power ur rpi using a 2A USB  port (eg: ipad/tab charger)

hmm u means the ipad charger is the plug head right? that will allow usb to connect to it? if yes i will try it later since i have that

using ipad/iphone/ianything charger won't get you 5v. only 4.6v. that alone BARELY powers up the RPi. let alone with other devices.

I never trusted apple to make good enough product, and this furthers my belief

using ipad/iphone/ianything charger won't get you 5v. only 4.6v. that alone BARELY powers up the RPi. let alone with other devices.

I never trusted apple to make good enough product, and this furthers my belief

a simple way to check if the power supply powers your RPi correctly is to plug it into RPi and buy a cheap RM10/20 multimeter and connect the multimeter's black + red cable to the RPi lah.

if it says anything below 4.7 then you're in trouble

Thundermatch website got already. But expensive a bit lah unless if we buy separate and from online.
What you want to do with your Pi then? 

thundermatch is hugely overpriced compared with the official price which is 35USD... 

anyway, I'm thinking of making few on/off switches/buttons that connect to the RPi - say, 20, 30 buttons - that on pressing it will execute a command (whatever command, be it in python or xbmc or whatever doesn't matter). Does anybody have any idea as to where to start?

I'm guessing the setup will be something like

buttons -> breakout board -> GPIO RPi

any idea guys? the breakout board (or something that can interface with 30 buttons) prolly needs to have tons of input that connects to the buttons.... no?