Dec 13, 2012  Android Interface for the BMW IBus Terrapin. This is an updated video of the android/ibus integration project I've been working on for the.

I've built a project using a RPi and one of Resler's USB IBUS interfaces which works nicely in essence, but the boot times of the RPi are making it unusable for some of the functions I had planned for it. To that end, I've started to look towards using an Arduino. I'm great a programming, but no so much when it comes to designing/building circuits. I've spend the best part of a week googling around, hunting for a reliable schematic, or pre-built BMW IBUS interface that will work well with an Arduino, to no avail.

I've read that the chip to go for is the Melexis TH3122, but I've hit two problems with that idea: • I can't find this for sale anywhere in the UK? • I can't find a schematic on how to hook this up to an arduino I'd be very appreciative if someone could point me on the right track, as I'm feeling like I'm going very unproductive circles here. It's actually an obsolete chip now, but they are still available from here: Not cheap at €5 each, and shipping is €6.90 to the UK from Germany.

I was about to order some more myself, and I'm happy to split the shipping cost if you like. How many are you looking for? I've attached my TH3122 schematic below. Pin 2 (EN) goes to a digital output pin on the Arduino. Drive it high to enable the chip, and drive it low to put the chip to sleep.

If you power the Arduino from the built in 5v regulator, you can use this to shut everything down to save power. The TH3122 will wake up as soon as it sees any traffic on the IBUS. As soon as this happens, the Arduino will also power back up. My entire system shuts down after 60 seconds of IBUS inactivity. Boot up is pretty much instantly. As soon as you hit the unlock button, it all fires up, and is running before you get the door open Tx & Rx are self explanatory.

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It is Tx to Tx and Rx to Rx though. Don't cross them over as you would normally. Remember to set the serial port to SERIAL_8E1 for the IBUS.

I feed pin 9 (SEN/STA) to one of the Arduino interrupt pins (2 or 3 on the Uno/Nano). This is used to tell if it's clear to send on the IBUS. Let me know if you need any more info. First I would like talk about my setup. My head unit is removed from the car and I powered it with an 12V adapter on my desk. Currently it is disabled as there is no ibus message on the line. I cannot create the schematics due to issues with KiCAD on win10.

But basicly I connected 12V+ to VBB, both arduino's and power supply ground to VSS, connected linbus to LIN line, CS to Arduino pin 8 and RX-RX and TX-TX and pin 2 to ibus line. I was trying to write my code just to receive but than I swithced on your code that you shared on 'Struggling with my BMW IBUS projects. Serial.read related issues.'

I just modified for my needs, I am using a mega and serial0 to communicate to PC and Serial1 to communicate with MCP2025. But I dont get any message beside '-- IBUS Gap Detect version --' and then a legth to zero. I am not even sure if the Linbus tranceiver wakes up or not. Hi, Here I attached my circuit. I dont see any pull-up resistor in the datasheet, I think mcp2025 has its own internal pull-up resistor.

I still dont have any communication with this one as well. I have another question as well about just a simple serial receiver but I dont know if it is better to open a new thread or not. I modified a bit two way serial communication example of arduino mega for Serial communication with pc. Do you think if we put aside the collision is it possible to communicate in that way without modifying the raw data? Can I see the hex codes separately on serial terminal or will it look like a mess? If I manage to communicate I would like to create a github account for a library and schematics to communicate with ibus. I think there are quite a lot people who are playing with this and unfortunately in most cases they have to discover it from scratch.