I need to connect a TTL bluetooth module with shield to my arduino.
I bought this module:http://www.ebay.es/itm/270933615210?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649#ht_1609wt_934
It's the TTL module, but i see this other module:
Serial bluetooth module:http://www.ebay.es/itm/1pcs-RS232-Bluetooth-Module-adapter-board-/280843079636?pt=LH_DefaultDomain_0&hash=item41638d4fd4
In the serial, the "TX" from the bluetooth it's going to connect to "RX" in arduino, and the "RX" of the bluetooth i need to connect to "TX" in arduino.
What is the correct form to connect the TTL bluetooth module to arduino?
I have this documentation.http://www.usconverters.com/downloads/bluetooth-module-btm5-datasheet.pdf
In the page 5, i can see the connections for the serial module, but the TTL??? 3.3V logic level??? what is this?
Thanks very much!