Later well fabricate a cable that can connect to a PC serial port that well plug in at J4 so we can program the BT2S module.The HC-06 is available from a variety of sources, including Amazon and eBay.These substituted parts are drop-in replacements, meaning the circuit board will work unmodified.I wanted to interface them to my Google Nexus 7 tablet, though, using bluetooth.
Ks 2000 Serial Cable Serial Port ThatThere are a number of bluetooth-serial converters on the market, but most are either expensive or require an external power connection. I wanted something that was self-contained, battery and everything. Ks 2000 Serial Cable Bluetooth To SerialSo, I built one for myself, using the Virtuabotix BT2S Bluetooth to Serial Slave module as the basis. Ks 2000 Serial Cable Plus Shippingask ForThe PC board is now available from FAR Circuits (price as of this writing is 4.50 plus shippingask for the Ek RS 232 Interface Board). The enclosure is a Pactec HML-9VB and includes a 9V battery compartment and a drillable front panel, available from a variety of sources (the part number for purchase from Mouser Electronics is listed below). Both the BT2S and MAX232 need a 5VDC source, and thats provided by U1, a 78L05 voltage regulator. D1 and R1 make up a power-on LED indicator (omit both parts if you dont want an LED to light when you turn on the circuit). D2 provides polarity protection, protecting the circuit if you accidentally hook up the power supply backwards. J1 is the connection to the BT2S module, and J2 is a stereo audio jack that is the connection to the serial line going to the device being interfaced. ![]() Prices are as of this writingthey will likely change over time. I saved the parts list as a Mouser Project, so you can access it directly rather than having to track everything down for yourself. Leave the BT2S for lastwere going to need to do a bit of work on that before we solder it to the board. Note that the capacitors and diodes have a polarity which must be observed. For the electrolytic capacitors, the longer of the two leads is the positive lead and should be inserted into the hole closest to the sign. C2 is a nonpolarized capacitor and can be inserted in either orientation. Before you solder D1 in place, consider that you wont want to mount it flush with the surface of the board. Instead, mount it so that its a half inch or so above the board, so you can bend the leads and have the top of the LED push through a hole in the front panel so its visible. U1, the voltage regulator, should be inserted so its flat side lines up with the flat side on the component outline on the board. At J4, break off a row of three of the header pins and solder them in place.
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