Uses generic HC04 or HC06 bluetooth adapter, MAX16910 & MAX3233. X1 is to bring out the 2nd serial port if your device supports it. A Female DB9 connector fits on one end of the board and the bluetooth adapter board hangs off the other end. This board was based off the reference schematic for the HC04, and adapted to fit the pinout of the serial port of the OpenTracker USB and TinyTrak3+, both of which can provide power out of the port. Standard RS232 signalling is available, and the unit will work from 3.5 to 30V on the power input rail.

Please note, there is a bug on this board where the 3.3v rail did not route from the voltage regulator to the level converter.