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08/09/12 14:03
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#188025 - controller?
Responding to: ???'s previous message
You haven't told what controller are you using. Also you should provide the link to the said "datasheet". What I could find was this: Is this what you are having?

There is one more rayson at but BTM-120 is not there on their product list, so I guess it's not your one.

Are you using correct voltage conversion between 5V/3.3V since most BTMs (bluetooth modules) are 3.3V powered? Do you know the factory default baud rate settings for this module? I recently bought a RN-42 BTM from Rover Networks & had trouble interfacing it to a microcontroller as controller wouldnt interpret it & show garbage (on LCD). To investigate the cause I connected Rx & Tx lines on the BTM as null modem connection so that characters may echo on terminal. The echoeing was okay at 9600 baud. So I got tricked it was "working" on 9600 baud, & kept blaming hardware for many days. But later on I read datasheet more carefully then I got to know the factory default baud was 115200!! Usually there is a pin which forces 9600 baud when pulled high/low.

Of course you will need detailed datasheet. But for now I suggest you try different baud rates.

List of 7 messages in thread
Query related to Bluetooth      Manoj Wakdikar      07/09/12 04:27      
   The first obvious question...        Hal Albach      07/09/12 05:11      
      And the second is...        Andy Neil      07/09/12 06:04      
   controller?      MUNISH KUMAR      08/09/12 14:03      
      out too late      Erik Malund      08/09/12 14:12      
         yikes!      MUNISH KUMAR      08/10/12 04:23      
            thanks to all of you      Manoj Wakdikar      08/31/12 11:51      

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