A Build it Yourself Bluetooth Serial Interface The Eks Files. Update Its possible to build this project with the cheaper and more readily available HC 0. V Bluetooth Serial Slave module, which is a drop in replacement for the Virtuabotix BT2. S module used below. The HC 0. Amazon and e. Bay. However, a few component substitutions are required U1, the 7. L0. 5 5. V voltage regulator, should be replaced with a 7. L3. 3 3. 3. V voltage regulator Mouser part number 5. L7. 8L3. 3ACZU2, the MAX2. MAX3. 23. 2 3. 3. V level converter Mouser part number 7. JPG' alt='3.5Mm Serial Port' title='3.5Mm Serial Port' />MAX3. CPEC3 C6, the 1. F electrolytic capacitors, should be replaced with 0. F polarized or non polarized capacitors the type isnt criticalyou can use the same part used for C2, Mouser part number 5. K1. 04. K1. 5X7. RF5. TH5No other changes to the circuit need to be made. These substituted parts are drop in replacements, meaning the circuit board will work unmodified. I recently acquired a couple of new toys an Elecraft KX3 ham radio transceiver and a Celestron Nex. Star 6. SE astronomical telescope. Both have serial interfaces for computer control. I wanted to interface them to my Google Nexus 7 tablet, though, using bluetooth. There 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. So, I built one for myself, using the Virtuabotix BT2. Point a remote control at your IR receiver and press some buttons. You should see something like this H. SATA PORT The SATA port allows you to. Audio, AudioVideo Combination Cables, converter cables to RCA, to 2. Pods and other smallmini cable type players. S Bluetooth to Serial Slave module as the basis. For this project, I breadboarded the circuit and tested it, and then I laid out a PC board that would fit in an enclosure that I selected, so the finished product would be nicely packaged. The PC board is now available from FAR Circuits price as of this writing is 4. Ek RS 2. 32 Interface Board. The enclosure is a Pactec HML 9. VB and includes a 9. V battery compartment and a drillable front panel, available from a variety of sources the part number for purchase from Mouser Electronics is listed below. This interface will pair with a PC or an Android device, but not with any i. Pad or i. Phone productsApple has locked down those platforms so only approved devices can be connected. Schematic Diagram. The schematic for the interface is shown below. Schematic for KX3 Bluetooth Interface. The BT2. S uses TTL level signals for input and output, so those need to be converted to RS 2. MAX2. 32 level converter chip. Both the BT2. S and MAX2. VDC source, and thats provided by U1, a 7. L0. 5 voltage regulator. C1 and C2 provide filtering for the 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 BT2. S module, and J2 is a stereo audio jack that is the connection to the serial line going to the device being interfaced. J3 is the 9 1. 2V DC input to the circuit, and J4 is a connector that allows you to connect the circuit directly to a PC serial port through a USB to serial converter, if needed so that the BT2. S can be programmed set the baud rate, ID, etc. Parts List. I put together a parts list for all the necessary components except for the board see above and the BT2. S which you can order direct from Virtuabotixprice as of this writing is 1. We make it easy for IT professionals to identify, find and get the hardtofind connectivity parts they need to enable their business solutions. Shintaro is a leading supplier of consumer products in the fields of Portable Storage, Digital Photo Frames, Optical Media, Camera Accessories, Keyboards and Mice. Belkin Lightning Audio Charge RockStar. Listen to Lightning Audio while charging your iPhone 7 and iPhone 7 Plus. Manufacturer of home automation systems, building and campus control systems. Part numbers are for Mouser Electronics, but most of these parts can be sourced from a number of different places, or you may have some of them in your junk box. 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. IDMouser Part Number. Description. QTYC1. ECE A1. HKS1. 00. Mm Serial Port' title='3.5Mm Serial Port' />F 5. V electrolytic capacitor. C2. 59. 4 K1. 04. K1. 5X7. RF5. TH5. F monolithic capacitor. C3 C6. 64. 7 UMP1. H0. 10. MDD1. 0u. F 5. 0V electrolytic capacitor. D1. 66. 7 LNJ2. 76. CK2. AALED1. D2. 51. N4. 00. 11. N4. 00. R1. 29. 1 4. 7. K RC4. KOhm resistor 14 W1. SW1. 61. 1 ET0. 1 0. PCB mount switch. U1. 51. 2 LM7. 8L0. ACZ7. 8L0. 5 voltage regulator. U2. 59. 5 MAX2. 32. INMAX2. 32 TTL RS2. J1, J4. 64. 9 6. HLF0. J1, J4. 64. 9 6. HLF0. J2. 80. 6 STX 3. C3. PCB mount stereo audio jack. Hr Policy Manual Bpo on this page. J2. 52. 3 G1. 7S0. EUDB9 male serial connector. J2. 52. 3 1. 7E 1. DB9 housing. 1for J2. NYS2. 31. BG Ustereo audio connector. J4. 52. 3 L7. 7SDE0. SDB9 female serial connector. J4. 53. 8 1. 6 0. J4. 85. 5 M2. 0 1. Offline Role Playing Game. Enclosure with 9. V battery compartment includes 9. V battery connector1. PC Board. Below are the top and bottom views of the PC Board from FAR circuits. Bottom view of bluetooth serial PC board. Top view of bluetooth serial PC board. Soldering. If youre inexperienced with soldering, there are plenty of videos on Youtube thatll teach you how. Take a few minutes and check them out. Heres one from Sparkfun Construction. For the most part, construction is pretty straightforwardinsert the parts through the top of the board and solder them on the bottom of the board. Leave the BT2. S 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. D1, the LED, also has a longer positive lead, and this lead should go into the hole closest to SW1. 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. D2, the 1. N4. 00. U1, the voltage regulator, should be inserted so its flat side lines up with the flat side on the component outline on the board. U2, the MAX2. 32 chip, should be oriented so that the dimple or notch in one end corresponds to the notch in the outline on the board. SW1 and J2 fit right onto the board and are soldered in place. At J4, break off a row of three of the header pins and solder them in place. Later well fabricate a cable that can connect to a PC serial port that well plug in at J4 so we can program the BT2. S module. J3 is where the power is connected. You can connect the 9. V battery connector leads herethe black wire goes into the negative hole and the red wire goes into the positive hole. Once everything is soldered in place minus the BT2. S, connect a 9. V battery and flip the switchthe LED should light. If not, check your battery, and then check all your parts placements and soldering. One more check to make is to check the voltage between the VCC and GND pads for the BT2. S youll need to do it from the bottom of the board. If its 5. V, youre good to go. Heres what things should look like so far Populated PC board without the BT2. SPC board and battery connector without the BT2. SConnecting the BT2. SThe BT2. S module comes complete with connector pins and a ribbon cable, and well use those to connect it to the PC board. This is a little bit awkward because you have to cram the BT2. S and its ribbon cable into the enclosure when you button things up, but its doable without a lot of trouble.