tdowgielewicz/linbus

An Arduino based LINBUS stack and signal interceptor/injector.

ARDUINO LINBUS GADGETS

An Arduino based LINBUS stack that allow to explore and hack linbus based system.

Unless specified otherwise, the PCBs can be used with standard Aruduino IDE, behaving as Arduino Pro Mini 5V 16Mhz with ATMEGA328.

**Analyzer** - a small PCB that connects on one hand to linbus and to a computer USB port on the other. The analyzer decode all the linbus frames and dump them to the computer. The USB connection emulates a serial port using a builtin FTDI adapter and can be read with standard serial application. A special python script is provided in the tools directory to dump the serial data in diff mode such that only changed bits are displayed. The board design support also linbus TX which allow to have this board functioning as a linbus master or slave (this however requires firmware changes).

**Beeper** - a small PCB and firmware that monitors a linbus and activates a buzzer when certain conditions met. The provided firmware includes a car specific example that beeps when the reverse gear in my car is engaged. The car specific logic is in the car_module* files and can be adapted to different applications.

**Injector** - a small PCB board with two linbus interfaces that connects in series between a linbus master and a linbus slave. The injector looks as a slave to the master and as a master to slave and it transparantly proxying LIN frame between the. At the same time, it can monitor bus signals, apply application spefici logic and can inject signals back to the bus by modifying on the fly LIN frames it proxys between the master and the slave. The Injector was developed to modiy the behavior of existing LIN bus based system (e.g. automatic activation of the Sport mode in my car).

**Feature Comparison**

Feature	Analyzer	Beeper	Injector
Max LIN speed	20kps	20kps	20kps
Min LIN speed	1kps	1kps	1kps
Operating voltage	12V	12V	12V
Max voltage	40V	40V	40V
LIN frame dump/log	Yes	Yes	Yes
LIN checksums	V1/V2	V1/V2	V1/V2
Computer serial interface	FTDI/USB	Serial 5V	Serial 5V
Computer serial speed	115,200	115,200	115,200
Audible output	No	Yes	No
LIN signal interception	Yes	Yes	Yes
LIN signal injection	No	No	Yes
Arduino IDE compatible	Yes	Yes	Yes
Programming language	C/C++	C/C++	C/C++
MCU	ATMEGA328P	ATMEGA328P	ATMEGA328P
MCU speed	16Mhz	16Mhz	16Mhz
Schematic/Layout software	Cadsoft Eagle	Cadsoft Eagle	Cadsoft Eagle
PCB Size (inches)	1.3 x 1.5	1.15 x 1.6	1.31 x 1.44
PCB layers	2	2	2
Component mounting	SMD	SMD	SMD
Min component size	0805	0805	0805
OSHPark compatible	Yes	Yes	Yes