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DIY: Do It Yourself
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Old 08-31-2014, 05:42 PM   #1
PancakeBimmer
Registered User
 
Join Date: May 2014
Location: PNW
Posts: 124
My Ride: BMW 325i
DIY: Cheap bluetooth K/I-Bus interface

This is as cheap as it gets. A small bluetooth k/i-bus interface.

Parts needed:
  • LIN bus transreceiver. I use MCP2025, but others used TH3122 or MCP2004 with success. It is best to use transreceiver with integrated voltage regulator to avoid having an extra component.
  • Bluetooth module. XBee bluetooth, HC05/06, or any other bluetooth with TX&RX pins will work.
  • (optional)Connector if you want this modular.

Tools needed:
  • Soldering iron with small tip, flux, and some solder.

How to:
  1. Program bluetooth module: set name, set pin, set baud rate and parity. On HC-05/06 it is done by sending AT commands with KEY pin pulled high. Baud rate must be 9600, 8 data bits, 1 stop bit, even parity. This is important.
  2. Put everything together. This will vary depending on which transreceiver and bluetooth module is used. In my setup TX pin on transreseiver is taking data in and sending to bus, whereas RX is outputting data from the bus. HC0-06 is outputting data on TX and receiving on RX. So two TX are connected, and two RX are connected as well. MCP2025 has integrated 5V regulator capable of outputting 70mA, which is probably enough for bluetooth module, therefore, 5V output from transreceiver is connected to VCC input on bluetooth module. +12 and KIBUS wires are connected to VBB and LIN/BUS pins respectively. Ground is connected to transreceiver and bluetooth module, this is where small wire will be needed.
  3. Connect final product to KIBUS in a car. Now any device connected to bluetooth module will be able to send and receive data to/from bus.

Here are pictures of my product, which I ended-up re-soldering and cleaning up to make it look nice.



After pairing phone with bluetooth module, I was able to receive (and send, although not pictures) data from bus.
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