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OBD-II Display for Rasperry PI/Linux and Tiny-CAN

OBD-Display

This text in German

Funcional scope

  • Query of measurement data (SID 0x01)
    • Configurable display of the PID values from 0x00 to 0x4E
  • Query of vehicle information (SID 0x09)
    • Breakdown of the Vehicle Identification Number (VIN) by manufacturer, country, model year, serial number, ...)
  • Read the error codes (DTC Diagnostic Trouble Codes) (SID 0x03)
    • Plain text Display of error codes via databank
  • Display CAN raw data (CAN-Trace)
  • Automatic recognition of CAN hardware and baud rate
  • HTML5 Web-Interface
  • Android: OpenXC (http://openxcplatform.com)

Screenshots

OBD-Display

OBD-Display

OBD-Display

OBD-Display

Hardware

OBD-Display

Installation

First the Tiny-CAN software package must be installed. For the operation of the software only the "libmhstcan.so" is required. "OBD-Display" searches for this file in the directory "/opt/tiny_can/can_api".

Download the file "tiny_can_raspberry_XXX.tar.gz" from "http://www.mhs-elektronik.de" and unpack it in the directory "/opt". Replace XXX with the latest version. The archive can be deleted after it has been unpacked. The access rights for the "/opt" directory must first be set, here are the individual steps:

$ sudo chgrp pi /opt
$ sudo chmod -R 775 /opt
$ cd /opt
$ mv /home/pi/tiny_can_raspberry_XXX.tar.gz .
$ tar -xzvf  tiny_can_raspberry_XXX.tar.gz
$ rm tiny_can_rasberry_XXX.tar.gz

Compile the Tiny-CAN API:

$ cd /opt/tiny_can/can_api/src/mhstcan/linux
$ make
$ mv libmhstcan.so ../../..

The Lib is already included in the package, usually compiling is not necessary.

Install "git":

$ sudo apt-get install git

Get "ObdDisplay" from "github":

$ cd /opt
$ git clone https://github.com/MHS-Elektronik/OBD-Display.git

Install development packages:

$ sudo apt-get install gtk2.0-dev

Compile "ObdDisplay":

$ cd /opt/OBD-Display/linux
$ make

Set up web page:

$ cd /var/www
$ sudo chown -R pi html
$ sudo chgrp -R pi html
$ cd html
$ cp -R /opt/OBD-Display/www/* .

Start "ObdDisplay":

$ cd /opt/OBD-Display/linux/bin
$ ./ObdDisplay

HTML5 Web-Interface

OBD-Display HTML5 Interface

OpenXC

OpenXC is a hardware and software API for automobiles developed by Ford Bug Labs and proposed as an open standard. Homepage: http://openxcplatform.com and the sources at: https://github.com/openxc OBD Display partly emulates the hardware of Ford and provides his data in "OpenXC JSON Message Format" per TCP/IP. The description of the data fomat can be found here: https://github.com/openxc/openxc-message-format/blob/master/JSON.mkd

Install Android App "OpenXC Enabler"

Downloads: The APK package for installation: https://github.com/openxc/openxc-android/releases OpenXC Enabler can also be installed via Google Play. The sources of the app: https://github.com/openxc/openxc-android

Setup: adjust "Vehicle Interface" to "Network". Put "Network host address" on the address of the computer running OBD Display. "Network port" is fixed at 50001. OpenXC setup

Dashboard of the OpenXC Enabler App OpenXC Dashboard

Sources/Links

Two of the core files, "obd_db.c" and "obd_decode.c" in this project are based on the OBD-II API from Ethan Vaughan, https://github.com/ejvaughan/obdii

With the ISO-TP driver I copied a bit from the ISP-TP Linux Kernel driver from Oliver Hartkopp, https://github.com/hartkopp/can-isotp

Most of the information I have taken from this document from emotive: http://www.emotive.de/documents/WebcastsProtected/Transport-Diagnoseprotokolle.pdf Really very worth reading, I can only recommend!

Other sources I have used:
https://github.com/iotlabsltd/pyvin/tree/master/pyvin
ftp://ftp.nhtsa.dot.gov/manufacture
https://de.wikipedia.org/wiki/Fahrzeug-Identifizierungsnummer
https://en.wikipedia.org/wiki/On-board_diagnostics
https://de.wikipedia.org/wiki/ISO_15765-2

Image Sources

Background graphic, VW Beetle:

Source: https://commons.wikimedia.org/wiki/File:Der_Samtrote_Sonderkäfer.jpg Author: Marco Strohmeier Licence: Public Domain

OBD-connector:

Source: https://commons.wikimedia.org/wiki/File:OBD2-Buchse-Stecker-Belegung.jpg Author: https://de.wikipedia.org/wiki/Benutzer:Losch Licence: CC BY-SA 4.0 https://creativecommons.org/licenses/by-sa/4.0

The image files were adapted for my purposes.

Tips and Tricks

Start the program automatically

If no mouse or keyboard is connected to the PI, it is useful to start the program automatically. To do this, copy the file "ObdDisplay.desktop" from the directory "tools" to the directory "/etc/xdg/autostart".

$ sudo cp /opt/ObdDisplay/tools/ObdDisplay.desktop /etc/xdg/autostart

Turn off the screensaver

Open the file "/etc/lightdm/lightdm.conf" in the editor as user "root".

$ sudo leafpad /etc/lightdm/lightdm.conf

In the section "SeatDefaults" modify the line "xserver-command" as follows or add if not exist.

[SeatDefaults]
....
xserver-command=X -s 0 -dpms
....

Rotate the screen display

Open the file "/boot/config.txt" in the editor as user "root".

$ sudo leafpad /boot/config.txt

Enter the following line into the file

lcd_rotate=2

After reboot the image should be rotated 180° and you can turn the display upside down so that the microUSB connector is at the top.

Make the mouse pointer disappear

For our special application, the mouse pointer is annoying. To remove the cursor very easily, we can install a package that hides it:

$ sudo apt-get install unclutter

After a reboot the cursor is invisible.

ToDos

  • Testing :-)
  • OBD-API: Customisation for SocketCAN, develop a SocketCAN Tiny-CAN API driver
  • OBD-API: Expand database ("obd_db.c/obd_decode"), PIDs
  • OBD-API: Different polling intervals for the individual PIDs
  • OBD-API: Only query PIDs that are also shown
  • OBD-API: Documentation
  • GUI: Porting to GTK3

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