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What would you like to build using Bluetooth? It is a very complex stack with multiple options for what you can send/receive over it. Things such as pairing of devices is not an easy task.
If you are simply looking to implement a device (e.g. data transfer, audio sending) then finding a module that accepts a suitable input (e.g. serial or audio) would be your best option. They are not particularly cheap at the moment though, especially compared to something like FM or Zigbee.
If you are intent on driving yourself crazy, the Bluetooth specifications would be a good place to start.
thnx....i wanna control my home appliances by my cell phone using bluetooth.....can this be
done by interfacing appliances 2 a bluetooth dongle or somethin like that.....!
if you could refer me some book that can teach me bluetooth right 4rm start, ie, how it works....?
Once you've understood the basics, check out some breakout boards and modules like this one.
I'll warn again, Bluetooth is not easy! You might find that running a simple webserver at home and browsing to that with your phone is much easier. You could get the site to send commands over a USB port or serial UART to a connected microcontroller, much easier to implement.
No, not really. Some Microchip PIC devices can act as USB hosts, but that isn't the norm and it wouldn't work properly anyway.
I already posted you a link to some Bluetooth modules and breakout boards. They are what you should be looking at for small devices that are Bluetooth enabled. It is still a very difficult task though.