so. i could do something like this guy : http://www.ebay.com/itm/HC-05-
with a "tranciever" like this: http://www.ebay.com/itm/HC-05-Bluetooth-
. if instead of the pins, i use the usb port, and solder the bluetooth, with the cables from the usb. will this work as well??
and what about the pc? the pc reads the bluetooth, with enother bluetooth dongle? (The same as i would use to read my Mobile, etc ? )
Yes, the cheapo HC-05. Both the items you allude to are the same, HC-05. The HC-06 will also do and may be even cheaper.
No, it is connected to pins 0,1 labelled Rx and Tx.
Yes, a $2.50 dongle would do. Use RealTerm to record the data. Note that you can't do this with the USB cable connected to the same computer. If your phone is Android, you can use that instead.