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Jurkov,
the DB-9 connections
1 12Vdc - I've soldered a diode into the feed to the regulator. Not essential.
5 - Gnd (Left most of the row of 5 looking at the mount or back of the
connector)
6 to the TX pin of the bluetooth module
9 to the RX pin of the bluetooth module
I've never measured the current flow, bluetooth modules are generally very low power. A more powerful one Sparkfun carries is listed at 25mA avg.
The TX and RX operate at a 5V signal level. In hindsight I'd not try and fit it all into a box with the DB-9 attached, no simple way to use the DB-9 screws and easy to knock the module off the mount, better to use a cable and put it elsewhere.
Bob
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