but this is only for one or maybe 2 or 3 or a few button. i want to control at least 20, 30?


it's for my arcade project

This post has been edited by C-Fu: Jan 5 2013, 12:34 PM

For the wireless adapter part, m not that sure on whats the issue, but i guess my issue was the distance
or the adapter power down when no activity. Because when the browser access the web server,
the wireless adapter tend to work non stop.. But when no devices access the internal webserver,
the wireless adapter tend to disconnect from the router. So i had to restart the whole pi.
The distance between the router and rpi box is approximately 6 meters.

So create a script which will check the wireless connection every 1 or 5 minutes and
script run ifconfig wlan0 down and ifconfig wlan0 up if in case connection breaks.
As the whole operation is headless, GNU screen is very useful. The program/script will
still run eventhough our terminal session ends.


Level shifter with circuit diagram planning - 3 days
C/C++ program - 7 days
PHP web output - 4 days

Took me approximately 2 weeks.

You would need a keyboard matrix circuit.
12 GPIOs in a 6x6 configuration would give you 36 keys

Keyboard Matrix Circuit

This keyboard matrix board is from a DIY game controller.


This post has been edited by totally_skint: Jan 5 2013, 06:38 PM

my friend last time try to check for wifi data collision thing using an app on his android phone
he use this method to find/locate best location/placing for his config/setup.
let me ask him what is the name of the app.

not sure if anyone else know of the app name/other method to check for wifi data collision thing

u mean due to the wifi channels ?

i'm not really a RF engineer/background, but this is what i roughly know.

A Wi-Fi station will transmit only if it thinks the channel is clear. All transmissions are acknowledged, so if a station does not receive an acknowledgement, it assumes a collision occurred and retries after a random waiting interval.

you can read more here.
http://revolutionwifi.blogspot.com/2011/03...rier-sense.html

or google 'wifi collision detection' (while i try to ask my friend more, should be tmr or monday cos i cant find him now)

if i am not mistaken usually due to channel overlapping,

channel 1,6,11 are the best as most router comes with either channel 6 or auto channel. But the weird part is my router is the only one in the office.

Or could it be the adapter self sleep when there is no activity ?

hmm... u seems to know more than me

r u doing it as final year project?
not sure if ur lecturer will allow u to put that problem (wifi issue) as future enhancement or not.
or just pretend everything is ok for the first 30 mins

kb matrix circuit eh? how'd you go about making one? looks simple enough.

I checked on ebay, but readymade ones are only up to 5x5 buttons. and all on one board, where i'd need one connected to buttons on a big tv-sized board. would it be simple to just buy a normal keyboard, cut the usb cord into GPIO-compatible wiring and somehow attach a wire that goes to the plywood board that has buttons?




basically for my arcade project, i've been search high and low for a good arcade cabinet (and cheap). i know some police stations have these machines lying around their compound after they took it from illegal arcades and such, and i'm in the process of getting one


but then i went to amcorp mall, and saw this kiosk stand that a company selling those android mk802s in front of the mall that looks really cool, and i think it's better for me to get one of that instead. and i'm gonna populate the body of the kiosk with buttons that play specific roms lah. but i have no idea where to get a kiosk like that, let alone getting a design reference for that. help?

This post has been edited by C-Fu: Jan 5 2013, 09:47 PM

No la, i just came across the channel overlapping part when we r trying to bond
& link aggregate multiple network interfaces in linux. When wireless networks
under same channel, link aggregation works but bandwidth doesn't multiply.

Then only i found out about it in wikipedia : (channel 1,6,11)
http://en.wikipedia.org/wiki/List_of_WLAN_channels

Not final year, its a small R&D for a factory (counting purpose), wireless & portable.

Wifi do disconnect, but there will be a script running every 1 minute, so
wifi will reconnect automatically.

I cant submit this as my fyp either because m pursuing chemical engineering.

I just made a laser-cut clear acrylic case for my pi

if anyone want a laser-cut acrylic case, please let me know

This post has been edited by I<3LYN: Jan 6 2013, 12:33 AM


Attached thumbnail(s)

not bad man. did you cut it yourself or you sent it to a fabricator? is it expensive? acrylic i mean. if not then i might just need you to help me fabricate the arcade cabinet

Looks fabulous..! How much does this cost.??

Thanks! I did it by myself. I have access to a laser-cutting machine. the cost consider kinda affordable. PM me if you want a quotation.

P/S: oh wait, i just misread you wanna make a arcade cabinet. I am not that skilled to build something that complicated, it might take a lot of trial & errors. Also, depending on the size and complexity, it might cost something.

Thx! PM me for a quotation

This post has been edited by I<3LYN: Jan 6 2013, 12:52 AM

Keyboard Hack

For keyboard matrix just google Mjoy16. It's a DIY game controller. You just want the KB Matrix board not the main controller.
Adapt the concept to your own needs.

---

Added on January 6, 2013, 9:05 amAll I need are just two pieces (with holes) to hold my Pi sandwich style.

This post has been edited by totally_skint: Jan 6 2013, 09:16 AM

i see. so u r using a script to reconnect every minute, seems like a workaround but in case, i think should be ok
cos cheaper n less work

UGPM

Precisely, cheaper alternative..

this is a bit off topic from raspberry pi, but it is regarding Rpi's alternative, the ODROID. it is getting an official nightly from CyanogenMod. not surprising since it is an Exynos based device, but hell.

can refer at the cm dev's G+ posts here https://plus.google.com/115049428938715274412/posts

Sounds interesting, price is kinda high compared to Rpi.
But the specs are impressive !

If you guys read this thread here
http://www.raspberrypi.org/phpBB3/viewtopi...=22158&start=75

you can see how people are dissapointed with RPi Foundation's stance on Android - which, to summarise... will not be officially supported anytime soon.

simply put, they don't care about android on RPi. and they certainly won't care if broadcomm - the makers of RPi's graphics chip - officially supports android development nor release the code for RPi.


while it is understandable that the Foundation's view of Raspberry Pi is for education, they just don't want to care if we use it for anything OTHER than for educational purpose, in the strictest sense of word.

aisehhhhh