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1  Using Arduino / Networking, Protocols, and Devices / Bluetooth TTL to Arduino on: May 10, 2012, 02:58:29 pm
Hi all!

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!
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