Arduino Canbus Dashboard

Introduction

Empty

Dashboard is an Instrument cluster or ICM instrument cluster module.

CAN standards

A controller area network bus (CAN bus) is a vehicle bus standard.

• Differential signaling
• CRC

ECU Electronic Control Unit

CAN 2.0 (classical CAN)

• eight bytes
• a typical baud rate of 500 kbit/s
• CAN2.0A, CAN2.0B,

CAN FD (releases 2012).

Some de facto standards for mechanical implementation: 9-pin D-sub type male connector

• pin 2: CAN-Low (CAN−)
• pin 3: GND (ground)
• pin 7: CAN-High (CAN+)
• pin 9: CAN V+ (power)

CAN C - Engine CAN (also known as chassis CAN): Fast communication speeds 125 kbps or 500 kbps

CAN B - Interior CAN (also known as body CAN): Communication speed 83 kbps

CAN signal structure (CAN frame)

• SOF (Start of Frame) 0 tells the other nodes that we want to talk.
• ID: is used to specify what the message means, and who’s sending it. Defines the priority: the lower the ID, the higher priority.
• RTR (Remote Transmission Request) indicates whether a node sends data or requests data from another node.
• Control contains the Identifier Extension Bit (IDE) which is a ‘dominant 0’ for 11-bit. It also contains the 4 bit Data Length Code (DLC) that specifies how many bytes of data will be in the message.
• Data: The 8 bytes contains the actual information.
• CRC (Cyclic Redundancy Check) is error detection.
• ACK slot indicates if the node has acknowledged and received the data correctly.
• EOF marks the end of the CAN frame.

An example

message ID: 620
data: 10 80 FF FF 80 20 00 80

CAN and Arduino and ESP32

Arduino

Some Arduino boards have CAN capability (like the Arduino UNO R4) or an add-on shields such as the MKR CAN Shield: Can class

MCP2515 CAN Module (Controller and transreceiver)

• CAN Protocol version 2.0B
• 1 Mbps
• MCP2515 CAN Controller IC and TJA1050 CAN Transceiver IC
• an integrated SPI Interface for communication with microcontrollers
• a 8 MHz Crystal oscillator
• 120Ω terminal resistance to prevent line reflections in the end of the bus.

Sparkfun CAN-BUS shield

• MCP2515 CAN controller and MCP2551 transreceiver
• CAN connection is via a standard 9-way sub-D for use with OBD-II cable.
• Lot of systems (place for GPS, SD card, joystick etc)

ESP

ESP32 CAN Controller a.k.a. TWAI Controller (Two-Wire Automotive Interface)

The ESP32 has a built-in CAN bus-compatible controller, it doesn’t have a built-in CAN transceiver, so we must use an external one to connect to a CAN network. The transceiver is for the physical layer, and the CAN controller controls the higher-level protocol of the CAN network (handling data transmission and reception, message framing, error detection, or message filtering).

TJA1050 High-Speed CAN Transceiver (NXP) or SN65HVD23x (Texas Instruments)

• ISO 11898-2 standards

OBD2

On-Board Diagnostic protocols or the OBD2.

CAN bus and Grafana

Grafana-Athena

https://www.csselectronics.com/pages/telematics-dashboard-open-source

MB

General

Volkswagon (not MB) http://www.volkspage.net/technik/ssp/ssp/SSP_238.pdf

https://www.benzworld.org/threads/the-230-can-bus-and-how-to-test.1988297/

• X connector

https://www.benzworld.org/threads/troubleshooting-the-can-bus.1989185/ W220 CAN B

• X30/6
• X30/5
• X30&4
• green and white cables; clip to open.

CAN NETWORK REPAIR GUIDE.pdf https://mbworld.org/forums/attachments/cl-class-w215-6/easy-can-network-repair-guide-735364/can-network-repair-guide-423584d1578925674

• Wake-up signal: Door switch, rear SAM, EIS, N70
• Reference Materials for Further Reading
  • GF00.19-P-0001PP Extended vehicle network function
  • SN00.19-P-0004GH Complete networking (163 as of 9/01)
  • GF54.00-P-0004A Data bus system function
  • GF54.00-P-0005A CAN data bus, function
  • GF54.00-P-0005-01A CAN data bus data telegram
  • GF54.00-P-0005-02A CAN data bus specification
  • GF54.00-P-0005-04A CAN data bus applications
  • GF54.00-P-0999ZZ CAN data bus, contents, function description
• W203: CAN H 0.65/0.025V, CAN L 4.65/11.0V
• X30/6. C215/220: A1 - Instrument Cluster
• W11: Can C & B: A1 ICM Instrument Cluster

Instrument clusters eg dashboard

"The instrument cluster has its own Robert Bosch CAN and not included here"

https://www.benzworld.org/threads/open-source-project-for-w211-219-209-203-owners-to-add-functionality-to-the-oem-instrument-cluster.3047965/

• 211/209/203/219 series
• an Arduino and packet capturing / analysis
• Xentry shows all the CAN ID's
• rnd-ash/W203-canbus https://github.com/rnd-ash/W203-canbus

https://github.com/rnd-ash/MBUX-Port

https://github.com/rnd-ash/mercedes-hacking-docs/blob/master/Chapter%207%20In%20Car%20Entertainment.md

• W203 (C class 2001-2007), W211 (E class 2003-2009), W215 (CL class 1998-2006), W220 (S class 1998-2005), W230 (SL class 2001-2007)
• Shows the connection diagram!
• Needs 2x 16Mhz Canbus shields

https://www.benzworld.org/threads/programming-the-instrument-cluster.3133946/

• W210s with FSS (1998+) https://manual.startekinfo.com/manual/JSP/ic1/1_14/m13.jsp
• via CAN Bus from Traction systems control module (N47):
• Odometer, trip odometer
• Electronic speedometer
• Low brake fluid level/parking brake indicator (only parking signal is sent via CAN Bus)
• Warning lamp brake pad wear
• ABS indicator
• ETS, ASR, ESP indicator
• Warning lamp ETS, ASR, ESP

CarCluster https://github.com/r00li/CarCluster

• VW Polo 5, VW Golf 7, Škoda Superb 2, etc.

https://projecthub.arduino.cc/databus100/digital-speedometer-to-cars-instrument-cluster-via-can-bus-9ee5ca

https://mhhauto.com/Thread-Mercedes-CAN-bus-message-database-and-ID-list?page=2

• ID200 - speedometer
• ID210 - TPS position
• ID218 - Transmission Control Unit
• ID308 - RPM's
• ID608 - coolant temperature

https://mbtools.com/guide/bench

• Wiring (better than the previous)
• SAE J1850 BUS

Videos

• Excellent!
• CAN-BUS shield V1.2 by Electrofreaks electrofreaks.com

https://www.youtube.com/@sciencetrove/videos https://random-science.com/

SimHUB