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Hello! I have bought this one:

http://www.ebay.com/itm/ws/eBayISAPI.dll?ViewItem&item=261024357609&ssPageName=ADME:L:OU:US:1123

My question is this:

1)Can ot work stand-alone, without arduino uno for example? What I really want is this: send a specific data (either H or L or a single byte) to the device that the BT module is being synced with. If I build my own board that provides the Tx pin with the data that I want to send, will the be transmitted to the device or not?

2)If yes, what type of input data does the Tx pin gets?Is it a pulse, is it a single bit, a byte or what? I cannot find it anywhere..
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It is not clear which chip is on your board, but that board for sure may work without Arduino uC .
How ever it is TTL I/O so you will need some voltage pump (max323) to work like normal RS232 interface (12V).

Interface expect normal serial input on 9600,N,8 rate, and you may send any type of data.
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1)Can ot work stand-alone, without arduino uno for example?
No. You need something else (a programmable microcontroller) that tells the BT module what data to send.
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So what do you suggest me to do. I want something much cheaper that an arduino because only thing I want to send is only one byte, not even receive data.
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To keep things simple, you can make an Arduino-compatible for $6 or less (ATmega328, crystal, a few capacitors, header(s), protoboard).
Or could use the smaller and cheaper ATtiny85.
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