how to build bluetooth device?

I wanted to turn on/off the LED light from my bluetooth enabled cell phone and building cost can be around $10, not above $10 :) . Is it possible?

Comments

[Cyberscann54]

it might be possible you can get a BT rs232 transceiver for $7.20 at DX  that will make the connection with it it may be possible I have also seen this circuit on ebay for even cheeper 

[frollard]

no.

you need 2 things;

an app on the phone willing to open the bluetooth stack's serial port (if available on your model)

and a bluetooth enabled circuit that listens for that serial connection once paired to control the light.

Basically...not for anywhere near 10 dollars. Then there's the programming part - possible but takes some learnin'