E46 BMW Social Directory E46 FAQ 3-Series Discussion Forums BMW Photo Gallery BMW 3-Series Technical Information E46 Fanatics - The Ultimate BMW Resource BMW Vendors General E46 Forum The Tire Rack's Tire Wheel Forum Forced Induction Forum The Off-Topic The E46 BMW Showroom For Sale, For Trade or Wanting to Buy

Welcome to the E46Fanatics forums. E46Fanatics is the premiere website for BMW 3 series owners around the world with interactive forums, a geographical enthusiast directory, photo galleries, and technical information for BMW enthusiasts.

You are currently viewing our boards as a guest which gives you limited access to view most discussions and access our other features. By joining our free community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join our community today!

If you have any problems with the registration process or your account login, please contact contact us.

Go Back   E46Fanatics > Tuning & Tech > DIY: Do It Yourself

DIY: Do It Yourself
Post here to share or improve your wrench turning skills! All BMW E46 DIY tips, tales, and projects discussed inside. Learn to work on your car and know the right BMW parts you will need!

Thread Tools Search this Thread Rating: Thread Rating: 1 votes, 5.00 average. Display Modes
Old 08-31-2014, 04:42 PM   #1
Registered User
Join Date: May 2014
Location: PNW
Posts: 211
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.
Attached Thumbnails
Click image for larger version

Name:	IMAG0016.jpg
Views:	717
Size:	312.8 KB
ID:	571391   Click image for larger version

Name:	IMAG0017.jpg
Views:	742
Size:	295.6 KB
ID:	571392   Click image for larger version

Name:	Screenshot_2014-08-31-14-19-02.png
Views:	668
Size:	52.7 KB
ID:	571396  
PancakeBimmer is offline   Reply With Quote
Ads by Google

Guests, get your FREE E46Fanatics.com membership to remove this ad.

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Censor is ON

All times are GMT -5. The time now is 01:06 AM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2016, vBulletin Solutions, Inc.
(c) 1999 - 2016 performanceIX Inc - privacy policy - terms of use