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Is there a way that I can connect a LED light to turn on and off via a wireless connection?
Hey all, I am currently doing my final project for university, and am looking into making a physical representation of online communication through lights. And was wondering if someone might know how (or if) you can control a LED light source through a wireless network connection controlled by a computer?
Any help or point in the right direction would be greatly appreciated?
This suggestion may be a bit more than you're looking for, but hey, at least it's not a link to some adsense spam site. 
This would be fairly straight forward to implement using a PC running Linux with a wifi card in it. You'll need some sort of LED light that's connected to the PC by USB, like the link below. The article's a bit old, and covers writing a kernel driver for the USB device. Fortunately, there's now a driver (usbled) in the mainline kernel, so you could skip the kernel driver coding.
So, now you've got an LED and a kernel driver that can turn it on. The final step is a bit of software that can observe when the wifi is available and turn the light on & off. That's fairly easy to implement in perl, python or even ruby. Not sure if those would be good languages for you, or if you're the C/C++ type (I'm not so much).
So, your program will need to loop, every N seconds (you figure out what value you want for N). Look at the output of "iwconfig" and see if the wifi card is associated with its AP. If it is, load the kernel module. If it's not, unload the module. OR, get even more creative - the device the article references supports color changes. So if there's no connection, make the LEDs go red, if there is one, go green.
If you just need to flip it on & off remotely, that's even easier - write a simple php/perl script you can hit with a browser to write the proper values to the r/g/b nodes in the sysfs tree.
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Cell Phone Roaming Charges are being eliminated by one of the
top wireless service providers
AT&T Wireless has announced an aggressive offer which will
eliminate cellular roaming charges for many of its customers.
This offer is made possible because of the company's doubling of
its national GSM coverage area in the past year, which is now
approximately 1.2 million square miles in the United States.
During the past year AT&T has has improved and/or added 15,000
cell sites. Major improvements have also been made in its GSM
network, according to AT&T Wireless, in a recent news release
These very positive changes will benefit cell phone users
throughout the country, who have been paying hefty cellular
phone roaming charges, once out of their coverage area. This has
always been a major source of dissatisfaction with mobile phone
users for many years. All AT&T Wireless customers can enroll in
this new national plan, which is called GSM America, together
with existing customers who are on one of the company's
qualifying GSM plans. Wireless phone users can automatically
benefit by paying no roaming charges anywhere in the United
States. As long as these customers are using a wireless data
service, they no longer have to worry about paying for roaming
charges when they place their calls. This is not only great news
for cellular phone customers but also for business customers.
Large businesses whose employees have to travel for work, can
now use their wireless date applications anywhere they travel.
Not only do they have more coverage areas, but they also incur
lower costs for their company. In addition to expanding its
coverage area, AT&T Wireless has also vastly improved the
quality of their GSM network and they have installed hardware
and software which allows customers to enjoy superior wireless
calling communication, through new GSM devices which generate a
stronger signal, travel over a larger area and penetrate walls
far better and more efficiently. These network improvements have
enhanced calling quality in many of the large major cities in
the country. These upgrades have led to increases in signal
strength of almost double and the audio quality of calls is
vastly improved. Unlike before, where signals were very often
poor or non-existent inside buildings, it is now being reported
that calls are coming through loud and clear from inside
buildings. In order for mobile phone customers to enjoy the
larger GSM service area and the superior network quality, all
new devices which AT&T Wireless introduces this year will be 850
compatible. The latest Motorola V600 camera phone will also be
compatible. The new AT&T Wireless GSM American national plan
will allow cellular customers to take advantage of the benefits
of the larger and more improved GSM coverage area. For as little
as $39.99 per month, customers can enjoy 450 anytime minutes
each month and they will not have to pay roaming or domestic
long distance charges. In addition to these great services,
customers will get free unlimited mobile to mobile calls on
AT&T's Wireless GSM network. If customers wish to choose a
slightly more expensive cellular phone plan, they can get
unlimited evening and weekend calling, starting at 7:00pm. For
those customers who make most of their calls from their home
coverage area, they can choose a local version of the AT&T
Wireless GSM American plan that suits their needs.
About the Author
©Copyright 2005. Caitlin Crosain is a successful writer
and publisher of cell phone related information such as where to
find the best Free Cellular
Phones, Wireless Plans and mobile accessories and MP3 players.
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