If you are using this board to actually create a CAN bus system (as I am for a robotic drone vehicle) then the skpang (designer of this board) code is not that helpful and a bit of a mess. It is well and good to be able to read things from your vehicle and log them, but that's not helpful when you are trying to create an actual bus.

Also, I really find it difficult when sample code does every conceivable thing all at once, forcing you to piece out the parts/understanding you need.

To create a network of senders and receivers, I tried a few different libraries. I recommend using the CANDUINO one http://code.google.com/p/canduino/downloads/list). Although the boards are not exactly the same, it will work, and you can see a sender and receiver working. Other libraries I tried, such as the one from saeed studios, didn't work for me, even though their boards are pin compatible. Might have something to do with their library using a CAN interrupt which, for me, was not reliable. Receiver would get only a single CAN message and then the interrupt would never fire again. Who knows why. Spent a number of hours on this.

So just want to save other folks some time if they are looking to build an actual bus system, and not just read data from their vehicles.

(Really wish a library link was included with this product. Could have saved me a lot of time.)

Is it really that hard to find and follow a standard? I understand that there probably isn't any official DB9 CAN pin-out definition, but the de-facto standard seems to be:
Pin 2 = CAN_L
Pin 3 = CAN_GND
Pin 7 = CAN_H
Pin 9 = CAN_V+(Optional)
This is as defined on 3 of the top 4 hits when googling "DB9 CAN bus pinout" (2 of the hits were the same site)
In fact, SKP themselves acknowledge the existence of this pinout in their CAN breakout board:
http://www.skpang.co.uk/catalog/canbus-breakout-board-p-754.html
Why reinvent the wheel guys? WHY?

For what its worth, I found the library here https://github.com/reeedstudio/CAN_BUS_Shield works the best out-of-the-box with a minor bug with receiving extended IDs. I fixed those along with some baudrate constants and the interrupt handing in the receive example which is located here: https://github.com/coryjfowler/MCP2515_Library

I would really like to see an updated version of the MCP2515 shield that has the CAN pinout. Continuing on with this false DE9 pinout is a bad idea. Additionally, removing the extras would be nice. I work in R&D where our product uses CAN (J1939) and this is the most bizzare CAN pinout I've seen on a DE9 and the reason for it, to support a pre-manufacture cable, is pretty silly. I could see doing such a thing for the first few revisions but it should be revised. I've not purchased ANY of the shields having this pinout to avoid having a non-standard DE9. I built my own shield mostly because I wanted galvanic isolation of the transceiver, but also because of the odd pin-out of assembled boards.

Supporting the "standard" pinout and selling an OBDII cable with a more appropriate pinout would be so much more preferred. I would also like to see the board minus the extra, application specific additions. (eg. Joystick & SD card slot)

After banging my head against the wall trying to get this board to work with the Arduino Mega 2560, I finally figured it out. As was mentioned previously, you have to wire the SPI bus pins 10-13 of the shield to 50-53 of the Mega 2560 as follows:

• Mega CAN bus shield
• 51 11 (SPI MOSI)
• 50 12 (SPI MISO)
• 52 13 (SPI SCK)
• 53 10 (SPI CS)

But, the final trick to get the SKPang software to work properly was to modify the port assignments in file "defaults.h" as follows:

// Atmega 168/328 pin mapping
//#define   P_MOSI      B,3 // pin 11
//#define   P_MISO      B,4 // pin 12
//#define   P_SCK       B,5 // pin 13
//#define   MCP2515_CS  B,2 // pin 10
//#define   MCP2515_INT D,2 // pin 2
//#define   LED2_HIGH   B,0 // pin 8
//#define   LED2_LOW    B,0 // pin 8

// Pins remapped to Arduino Mega 2560
#define P_MOSI          B,2 // pin 51
#define P_MISO          B,3 // pin 50
#define P_SCK           B,1 // pin 52
#define MCP2515_CS      B,0 // pin 53
#define MCP2515_INT     E,4 // pin 2
#define LED2_HIGH       H,5 // pin 8
#define LED2_LOW        H,5 // pin 8

I did some reading here: http://www.arduino.cc/en/Reference/PortManipulation It discusses the advantage of better speed of controlling I/O pins by writing directly to the ports, but the disadvantage is that it is not a portable design to other processor pin maps. Yup.

The 2 pin maps I found here, and corrected the mappings: http://arduino.cc/en/Hacking/PinMapping168 (this is what the shield was designed to run with) http://arduino.cc/en/Hacking/PinMapping2560

This works! Hallelujah!

If anyone is trying to test this via Bus Pirate do not forget to connect the Reset line to +5V. The board requires voltage to RST or else the MCP2515 will be unresponsive.
SPI>W
Power supplies ON
SPI>[0b11000000]
/CS ENABLED
WRITE: 0xC0
/CS DISABLED
SPI>[0b00000010 40 1 1 1]
/CS ENABLED
WRITE: 0x02
WRITE: 0x28
WRITE: 0x01
WRITE: 0x01
WRITE: 0x01
/CS DISABLED
SPI>[0b00000011 40 r r r ]
/CS ENABLED
WRITE: 0x03
WRITE: 0x28
READ: 0x01
READ: 0x01
READ: 0x01
/CS DISABLED
SPI>

Hi. Can someone link to a project or code sample that uses this shield with the CANbus and the SD card at the same time on an Uno?

I'm working on a project that is to have 3 slave units generate sensor data that they are to save on their own SD cards as well as send via CAN to the master unit. At the same time, the master unit is to receive that data and store it, and based on the data calculate and send via CAN an instruction code back to the one slave unit that controls an actuator.

We can get the master and one slave to communicate with each other, but not the master and more than one slave, and we can get everything to store stuff to SD cards, but not communicating with each other at all.

We've been working based off the Seeed Studio CAN-bus code and the Cory Fowler code, and clearly just don't get how to modify these so each board can save data to its own card and communicate with the master unit.

Thanks.

What is the easiest method to use this shield with the arduino mega?

I have purchased a couple of these shields and they are great. I am wondering if anyone has been able to use these as a CAN to USB adapter to read and write live messages using a GUI similar to http://www.canviausb.com/

I used this shield for prototyping a design, and it's all working. Now I'd like to know, if I buy parts to build my own board, is there any programming required for the MCP2515/MCP2551? Or are these chips installed on this board exactly as they come from Microchip. If not, is source code available to make these chips function as they do on this shield?

guys how do i connect the serial lcd?the lcd has three pins, RX, GND, VDD. I have soldered the pinouts in the shield, but i dont know which pinout is gnd, which rx, which vdd. Any help please?

Let me start by saying that I'm new to this scene, and I'm presently just trying to verify compatibility to make sure that I purchase a product that is capable of meeting my expectations.

I'm currently looking for a device to communicate with a SEVCON GEN4 Controller (http://www.thunderstruck-ev.com/Manuals/Gen4_Product_Manual_V3.0.pdf). As a bonus, I also hope to be able to communicate with my NMEA 2000 Garmin 17x GPS receiver (http://www8.garmin.com/manuals/2250_TechnicalReferenceforGarminNMEA2000Products.pdf) .

I'm considering using an arduino with CAN-BUS shield, and eventually also adding in an ethernet shield. I was wondering if anyone has used this product to communicate with a SEVCON GEN4 controller, or NMEA 2000 marine equipment (http://www.interfacebus.com/NMEA-2000_Standard.html)? Should I buy the UNO or MEGA? Does anyone know if the CAN-BUS shield is compatible with the ethernet shield? I hope to to eventually be able to move all the comms between my controller/GPS and my laptop from the direct USB connection to WIFI...

I appreciate the time anyone chooses to take to answer my questions!

Minor note, I believe that left and right on the joystick are reversed Left is actually pin A5 and Right is pin A2. also you need to set up the pull up resistors for the digital inputs for the joystick or it won't work correctly. Example code doesn't do that, actually I'm finding a lot of bugs in this code.....
pinMode(UP,INPUT);
digitalWrite(UP, HIGH);
Also, side note for Arduino Mega users, A0 - A5 aren't the same pin number as in the regular Arduino, so the code will have to be modified accordingly.

define UP A1

define DOWN A3

define LEFT A5

define RIGHT A2

define CLICK A4

You've got a problem when you example code fails to compile...

I have just purchased one of the CAN Bus Shield for a 3rd year project for my Degree and already have a Serial 1602 I2C (LCM IIC 1602) LCD Module with VCC, SDA (TX Data), SCL (RX Data), and GND on it.... it currently connects to the analog lines on the Uno R3 that I have, however the CAN Bus shield will connect to this.

My question is this: Can I connect the LCM I2C Serial module to the three pins on the CAN Bus shield? The Sparkfun shield however only has VCC GND and RX.. Can I connect just the RX VCC and GND pins from the CAN Bus to the respective pins on the current LCD module that I have and if so what happens to the TX line (SDA)?

thanks in advance

Paul

This CAN-BUS Shield adopts MCP2515 CAN Bus controller with SPI interface and MCP2551 CAN transceiver to give your Arduino/Seeeduino CAN-BUS capibility. http://www.elecfreaks.com/store/canbus-shield-p-746.html

Does this work with ODB 1?

Is this support for Low Speed Can?

Hallo

I am working on an home automation project where my task is to communicate between LPC1766(Cortex M3) and LPC11C24(Cortex M0).

Can anyone tell me or put a sample coding on how to communicate between two different microcontrollers using CAN BUS

Hello everyone

I have been trying to get some data from my car using this shield and the OBD-II to DB9 Cable. But I can't get the data of the RPMs of the motor, anyone have any advice for me?

Thank you!

Can I use the EM506 GPS module with this shield? I have the shield already, bought it a long time ago -but the EM406 seems to no longer be available.

I have connected this shield to an Arduino YUN and is working to a certain extent. I am able to perform the loopback test using this code: https://code.google.com/p/canduino/source/browse/trunk/Source/canduino_DEMO/LoopbackTest.pde

It works as long as the mode is set to "LOOPBACK". If I try running the test with mode set to "NORMAL", it does not work.

I realize that messages are not going out on the actual bus when running in LOOPBACK mode, so the only way to test the input/output transceivers is to run the test in NORMAL mode. I believe I have a correctly terminated CAN bus, with 70 ohms across CAN-H and CAN-L.

Based on the comments in the code, I'm assuming the test should work in NORMAL mode using a single node. Has anyone been able to run a loop back test in NORMAL mode?

Hi guys, I tried the demo sketch on my arduino meda adk but does not work the "read" function. I am not able to read anything. There is someone that can post a simple sketch to read all the data on the bus^ Thanks

Holy sh%&,

it costed me several hours to find out, that Amazon apparently is setting the standards for the CAN-pinout. At every CAN-Cab, or other gadgets to analyze the CAN, the pinout is 2 Low - 7 High and 3 GND, as mentioned by calvinium. If in doubt, take a look at http://vector.com/ . They set the quasi-standard in CAN-analyzing ( at least in Europe :) ) .

Hi guys, there is someone that can precisely explain which are the steps to follow and which are the library to use to read CAN messages using an Arduino Mega ADk. Thanks

Not finding demo code on the SK Pang Site/

Can I use more than two of these shields to create a net?

Right now, I'm running into a wall with collecting data on the Uno using this shield. I need GPS latitude/longitude and a few things off of a CAN-bus connection on a car, and I need to write these things to a micro SD card. With the Uno, I can do GPS or CAN, but not both at the same time. I'm investigating the Arduino Mega 2560 as a way to solve this problem. Will the Mega allow me to do my file writing, and what adaptations do I have to make in order to do so?

I use this shield to get data from an Isobus terminal, and was trying at first with the Arduino Leonardo. This didn't work because the spi pins are on a separate header. Could I suggest for compatibility reasons to move the spi to the icsp header? This way the shield automatically works on Leonardo and mega boards as wel.

As anyone succeed to connect this shield on an NMEA 2000 network. I would like to be able to have some data product by my Volvo Penta on my boat via an NMEA2000 : VOLVO BOX The only thing i new is that NMEA 2000 is based on can bus So what must be done :

• 12V / 5V
• Common ground, protection, isolation
• Connectors : I would like to be able to plug the shied like a standard NMEA 2000, that means T cable and micro-c connector
• Hardware adaptation if any, i expect none
• Open software for data conversion and analysis

Old programmer, I start with arduino so, any help would be more than welcome

Hi, I am trying to send messages on a CAN-BUS using this shield but I cannot. I tried with different libraries including the demo code, this one https://github.com/coryjfowler/MCP2515_lib and the one from canduino project. I am using an Arduino UNO R3 and I put a resistance between CAN_L and CAN_H pin. Am I missing something? Do you have any sample code for sending CAN messages?

Can CANOpen be used or implemented with this shield?Guys please let me know.I have a motor controller which speaks over CANOpen and I literally have no idea about CAN or CANOpen.How is CANOpen different from CAN.

Ranjan

Hello. I have purchased this shield, but realized that the network i'm trying to connect to is a low speed CAN(fault tolerant CAN). Can you use this as a low speed CAN? I know the termination resistor is setup different in a low speed CAN. Please let me know. Thanks in advance.

Yay changes >> Use the library here: https://github.com/coryjfowler/MCP2515_lib

Have anyone got this shield to read extended (J1939) headers? I got the send part to work, but the read messes up the id. Thank you.

i think the coding does not work with arduino IDE 1.0. when compile, the IDE show compile error like below. hopefully someone can tell me what is the problem. TQ.

file.writeError = 0; 'class SdFile' has no member named 'WriteError'

Has anyone used this shield with a slower (1.0) can bus? I think about using it with an older piece of equipment and would like to know in advance if this shield is downward compatible.

Hello,

Can this shield run on 100kbaud rate? I am asking because Seeedstudio's CANbus shield, which has both MCP2515 & MCP2551, does not operate at different baud rate other than at 500kbaud. Just wanted to double check if this one can run on different baud rate, in my case 100kbaud, before I buy this. Thank you.

This shield seems to be incompatible with the Aruino Leonardo:

SPI: on the ICSP header. These pins support SPI communication using the SPI library. Note that the SPI pins are not connected to any of the digital I/O pins as they are on the Uno, They are only available on the ICSP connector. This means that if you have a shield that uses SPI, but does NOT have a 6-pin ICSP connector that connects to the Leonardo's 6-pin ICSP header, the shield will not work. (from http://arduino.cc/en/Main/ArduinoBoardLeonardo)

FYI, there is something wrong with the schematic link. It is effectively blank.

I need the CAN bus to run on 1 Mb/s, but no idea how to change that. In the library only speeds up to 500 kb/s are supported. Any ideas? Thank's Thomas

Anyone see this dual channel CAN bus adapter for Arduino Due http://store.evtv.me/proddetail.php?prod=DueCANBUS

Apparently there is a library out for it as well. https://github.com/collin80/due_can

Hi,

I am really new into this stuff so this might be a really bad question - I tried installing the default code (v4) from SkPang but for some reason I get an instant "Can't init CAN" message and a blinking green light (I think it says D7 on the PCB) even though I am almost certain that my Clio II uses CAN at 500kbps. There is no delay what so ever - it just instantly goes to the error so I assume the init returns false. I tried digging into the mcp2515_init but I can`t really understand what is going on there.

I am using an Leonardo if that matters.

Does anyone know about using this to set up a CAN network?

For the DB-9 connector, I was expecting that CAN_H is on pin 7 and CAN_L on pin 2 like: http://www.kanda.com/images/canpinout.gif

However what seems to be happening on the eagle file is that CAN_H is on Pin 3 and CAN_L is on pin 5. Is what I am seeing correct? or Have I got an old eagle file? Or is it wired this way for a reason?

For those of you out there running SK Pang's version 4 code for this board on an Uno R3, realize that you're probably going to run into the maximum the board can handle if you decide to throw in some debugging code, like Serial.println() statements to see what's going on in more detail than the LCD can provide. The functional limit (using libraries available as of 3/19/2013) seems to float somewhere around 20,000KB sketch size. I'm going to try this again with a Mega 2560 to confirm that more memory helps.

Is this shield compatible with the Arduno Due?

Jack Rickard

I found a problem with my cable...

I found that the connections from the OBD connector to the D-Sub are not what I expected. The connections to the Canbus (High and Low) were for a protocol different to my own. The signal wasnt getting to the correct pins on the DSub.

I soldered the wires to the correct pins. However no improvement...

Anyone have an idea on the next thing to look at?

Here is the software and Arduino firmware which I used to communicate with my Volvo S80 '02: https://github.com/festlv/canbus_logger

It includes GUI frontend on PC which I used to find out which of all the messages (300+ per second) correspond to keys pressed on steering wheel.

Please keep in mind that you will probably have to re-define some pin #s, as I didn't exactly use this shield (but the CAN-bus schematics was almost identical). It may also not compile in Arduino IDE on the first try- I use Sconstruct for code deployment to Arduino.

Hi All Does any body know if it is possible to use CAN-BUS shield to make communication between arduino uno. and plc(programmable logic control )for automation .If you take in your account my own plc has can-bus capapilty already.

thnx

Just curious folks, but is there any interest in a similar Arduino shield for Single Wire CAN which is usually used by General Motors for GMLAN?

I have made a library for VSCP (http://www.vscp.org for this shiled. Library plus a fully working VSCP over CAN sample is available here https://sourceforge.net/projects/m2m/files/VSCP%20Firmware/

VSCP is a free and open protocol for home automation and other control tasks If you are intersted to learn more about the protocol can find more information here http://vscp.org/docs.php

Enyoy! akhe

Has anyone tried this with 29bit J1939 extended protocol?

Hi there, I have recently bought this shield but there is no way to make it work =( I have commented all SD/GPS/LCD related functions as I dont want to use it (for the moment at least) and have added some code to use a liquidcrystal. By the way it gets stuck in this line “if(Canbus.init(CANSPEED_500))” because nothing else is being displayed (one print before and one after). Any idea about what is happening? Thanks in advance

Guys please i have one question. Can i use this shield to program, not read, but program a brain of a car? Please help! Thanks!

I am not sure if this is being monitored anymore, but I am having an issue with this shield. I am successfully recording data to the SD card and polling the CAN card. However, the CAN buffer is never being populated. I am trying to record broadcasted CAN communications from another CAN device. I have verified, with another CAN card, that data is going out over the network. I was wondering if anyone has had any issues with this type of problem or if I might be overlooking something obvious.

I am using skpang's latest ECU code, and using the message_rx function to poll the bus.

Any thoughts?

UPDATE : I placed an 120 ohm resistor between the CANh and CANl pins since I am directly connecting with another terminated node. I have verified that the other node is communicating at the same speed and, with another adapter, that it is transmitting data. I have run the loop back test described by some other tutorials and that is successful.

UPDATE 2 : Ok, so try not to make the same mistake I did with the pinout. This shield doesn't follow any de facto pinouts for CAN connectors. So unless you are using one designed for this shield it is likely that whatever you are connected to won't work out of the box. Everything appears to be working at the moment.

Has anyone been able to get this thing to work???

I'm having a lot of trouble with it

how can my can-bus interface with a clas II data bus? any idea?

Can i use this shield for application except based on "Car". Can i connect this shield to my computer via sub-D connector

I'm trying to connect the CAN-BUS Shield to the Arduino Uno R3. Does anyone have any sample code I can look at or know any good resources to help with coding? any thing relative will help! Thanks!

Hi Guys, Probably I have a silly question, but I was wondering what is the difference between this shield and the OBDII-UART. I am new to electronics and I want to make a trip computer for my car.

Still pretty new to the arduino, but I bought this board and downloaded the code and library from SK Pang; http://skpang.googlecode.com/files/Canbus_v4.zip. Listed for use with IDE 1.0. I get all kinds of compiler errors, most of them due to the SD card code, and a few for the use of NewSoftSerial (changed to SoftwareSerial).I really want to play with this, but with all the errors I am not sure i am up to the task of getting the code fixed. Has anyone gotten this to work with a UNO and 1.0? Thanks Joe

There is a new version of the sketch for Arduino 1.0 on the product page now: http://www.skpang.co.uk/catalog/arduino-canbus-shield-with-usd-card-holder-p-706.html

Is there any code working with Arduino UNO v1?

Can someone confirm the schematic in the Eagle file? the schematic shows that Pin 18 (Vdd) on the MCP2515 is open. The photo of the board shows the pin to +5V. Am I missing something?

I'm a bit confused about OBDII and some proprietary protocols like Multi-User Tester (MUT). Will this board be able to interpret MUT II protocol like that of a Mitsubishi Mini Pajero, 1994-1997 model?

This website (http://www.obdtester.com/carinfo/mitsubishi/all_models/) tells me all 1996 models and up supports ISO-9141, part of the OBD II suite. But I am unsure if ISO-9141 is compatible or compliant with MUT II.

Im trying to read data using a Mega with jwschmo's modified code and it begins recording before actually getting the response from the car which is a 2006 Buick Rendezvous. Also it when it actually is connected it does not write anything except the initial header. Any ideas?

Guys - love the shield, but can't seem to get it to function on either of my cars - both Mercedes.
I suspect that the CAN-D accessible via the ODBC port requires something to tell it to "start". Still digging for that, anyone with any advice, mucho appreciated.
Second, I can tap the CAN-B - internal CAN - which runs at 83kbps, but I'm not sure how to configure the shield to support 83.333kbps!?

HELP! I have a terrible problem at work, that I need to build a CAN bus gateway for, which means I need 2 CAN busses. Can I have an Arduino board read messages on one port and send them out the other?

Is the "9-way sub-D standard OBD-II connection cable" included with this shield, or listed as a "suitable" choice as an add-on?
Also, does the serial LCD connector supply 5V or 3.3V?

Is this shield CAN bus only or is it backwards compatible with the other ODB-2 protocols, SAE-J1850 VPW, ISO 9141, KWP2000 and SAE-J1850 PWM?

Hey guys, was wondering if you could help me out. I started using some of the code listed here for my canbus application, and the code has been working flawlessly. What I want to be able to do next is to just "sniff" the canbus just to see what messages are currently being passed back and forth. I started a thread here:
http://forum.sparkfun.com/viewtopic.php?f=14&t=28999
Thanks guys

Hi Guys - just got this one. Have anyone used it to BROADCAST data into CANbus (as opposed to just listening)? Anyone has code examples? The message_tx() function in the SKPang library seems to be just a placeholder...
What I am trying to do: we have some aux equipment running in the car and I'd like to push some operational parameters from that equipment into the CANbus so it can be picked up by the Android-based CAN visualization app we are using (Torque).
Thanks!
Valery.

I have a CAN Bus Network from which I want to read messages but I cannot under any circumstances write any messages. And I need to take this messages and write them to another CAN Bus network. Does anybody have any ideas on how to do this.
Thanks

Hi,
I bought the CAN-BUS Shieldand I'd like to use it with mu arduino mega 2560 board.
I tried to use your "8 March" code (http://code.google.com/p/sparkfun-arduino-can-shield-code/downloads/detail?name=CANInterface.zip&can=2&q=) but when I power my board after the "sparkfun" screen nothing appear.
I connect (Pin 13 -> Pin 52 Pin 12 -> Pin 50 Pin 11 -> Pin 51 Pin 10 -> Pin 53) and de-connect pin 13, 12, 11, 10 from the Arduino mega board.
Can you help me please ???
Thank you,
Stefano.

what lcd can i use with this? seems the 5 v one is popular since they are always sold out. i see there are the 3.3v ones ,but the shcematic looks like vcc for the lcd could be 5 v.

Ok, code is posted here:
http://code.google.com/p/sparkfun-arduino-can-shield-code/downloads/detail?name=CANInterface.zip&can=2&q=
should only have to take what is in there and paste it in your library and you should be all set, I'll double check here in a minute. good luck

Does anybody know if it is possible to connect two of these to each other to form an Arduino-to-Arduino communication link? This could provide a good connection for long distance communication or to connect multiple nodes and form a network.

If you want play with CAN in arduino you can also use the OLIMEX AT90CAN128 Eval board:
http://www.sparkfun.com/products/8279
Works out good value as you get a whole dev board for almost the cost of this sheild. And you get native CAN support.
Only catch is you need to program the arduino bootloader to it, some instructions here:
http://arduino.cc/forum/index.php/topic,53309.0.html

Save you hair. They have a tendancy to fall off on their own as time goes on... Anyway, I'm not sure what you mean by pastebin, I assume it's the comments box at the top. I'll put the code in there again assuming you have a way to reformat the code. Here it is: >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
/* Welcome to the ECU Reader project. This sketch uses the Canbus library. It requires the CAN-bus shield for the Arduino. This shield contains the MCP2515 CAN controller and the MCP2551 CAN-bus driver. A connector for an EM406 GPS receiver and an uSDcard holder with 3v level convertor for use in data logging applications. The output data can be displayed on a serial LCD. SK Pang Electronics www.skpang.co.uk v1.0 28-03-10 Modified by: R. Letourneau VE3MPV for the Arduino MEGA - Feb 18th, 2011 Pin assignment: CAB-BUS MEGA ------- ----- RST Reset +3.3 3V3 +5V 5V GND GND 13 52 SCK/PB1 12 50 MISO/PB3 11 51 MOSI/PB2 10 53 SS/PB0 9 9 PH6 8 8 PH5 7 7 6 16 TX2 5 18 TX1 4 19 RX1 A4(18) 25 A3(17) 23 A2(16) 24 A1(15) 22 / // #include #include #define COMMAND 0xFE #define CLEAR 0x01 #define LINE0 0x80 #define LINE1 0xC0 #define sGPS Serial1 // NewSoftSerial mySerial = NewSoftSerial(4, 5); #define sLCD Serial2 // Repalces: NewSoftSerial sLCD = NewSoftSerial(3, 6) #define LED2 8 #define LED3 7 #define D9 9 #define UP 22 #define DOWN 23 #define LEFT 24 // Should be the RIGHT #define ENTER 25 #include #include #include #include #include #include #include #include #include FAT TestFile; char buffer[512]; int read_size=0; int count=0; #define COMMAND 0xFE #define GPSRATE 4800 #define BUFFSIZ 90 char *parseptr; char buffidx; uint8_t hour, minute, second, year, month, date; uint32_t latitude, longitude; uint8_t groundspeed, trackangle; char latdir, longdir; char stat; void setup() { Serial.begin(9600); sGPS.begin(GPSRATE); sLCD.begin(9600); pinMode(LED2,OUTPUT); pinMode(LED3,OUTPUT); pinMode(UP,INPUT); pinMode(DOWN,INPUT); pinMode(LEFT,INPUT); pinMode(ENTER,INPUT); digitalWrite(UP,HIGH); digitalWrite(DOWN,HIGH); digitalWrite(LEFT,HIGH); digitalWrite(ENTER,HIGH); pinMode(D9,OUTPUT); // Used for SD_CS in file: sd_raw_config.h // macros: select_card() & unselect_card() // Canbus/defaults.h pin assigment changed for MEGA Serial.println("ECU Reader"); sLCD.print(COMMAND,BYTE); sLCD.print(CLEAR,BYTE); if (Canbus.init(CANSPEED_500)) { sLCD.print("CAN Init ok"); } else { sLCD.print("CAN Init Failed!"); while (1) ; } delay(1000); sLCD.print(COMMAND,BYTE); sLCD.print(CLEAR,BYTE); sLCD.print(COMMAND,BYTE); sLCD.print(CLEAR,BYTE); sLCD.print("Mode: CAN GPS SD"); sLCD.print(COMMAND,BYTE); sLCD.print(LINE1,BYTE); sLCD.print("Push: Dwn Up Rt"); } void loop() { if (digitalRead(UP) == 0) { Serial.println("GPS..."); sLCD.print(COMMAND,BYTE); sLCD.print(CLEAR,BYTE); sLCD.print("GPS..."); gps_test(); } if (digitalRead(LEFT) == 0) { sLCD.print(COMMAND,BYTE); sLCD.print(CLEAR,BYTE); sLCD.print("SD..."); Serial.println("SD..."); sd_test(); } if (digitalRead(DOWN) == 0) { Serial.println("CAN..."); sLCD.print(COMMAND,BYTE); sLCD.print(CLEAR,BYTE); sLCD.print("CAN..."); while(1) { Serial.print('.'); // Mind pacifier if(Canbus.ecu_req(ENGINE_RPM,buffer) == 1) { sLCD.print(COMMAND,BYTE); sLCD.print(LINE0,BYTE); sLCD.print(buffer); } digitalWrite(LED3, HIGH); if(Canbus.ecu_req(VEHICLE_SPEED,buffer) == 1) { sLCD.print(COMMAND,BYTE); sLCD.print(LINE0 + 9,BYTE); sLCD.print(buffer); } if(Canbus.ecu_req(ENGINE_COOLANT_TEMP,buffer) == 1) { sLCD.print(COMMAND,BYTE); sLCD.print(LINE1,BYTE); sLCD.print(buffer); } if(Canbus.ecu_req(THROTTLE,buffer) == 1) { sLCD.print(COMMAND,BYTE); sLCD.print(LINE1 + 9,BYTE); sLCD.print(buffer); } digitalWrite(LED3, LOW); delay(50); if (digitalRead(ENTER) == 0) break; } dispMsg(); } delay(1000); } void sd_test(void) { Serial.println("ready..."); TestFile.initialize(); Serial.println("Starting..."); TestFile.create_file("rej7.txt"); TestFile.open(); while(1) { TestFile.write("This is test data."); TestFile.close(); while(1) { TestFile.open(); read_size=TestFile.read(buffer); Serial.println(read_size, DEC); for(int i=0; i '9') || (str[0] < '0')) return d; d *= 10; d += str[0] - '0'; str++; } return d; } void dispMsg() { sLCD.print(COMMAND,BYTE); sLCD.print(CLEAR,BYTE); sLCD.print("Mode: CAN GPS SD"); sLCD.print(COMMAND,BYTE); sLCD.print(LINE1,BYTE); sLCD.print("Push: Dwn Up Rt");; Serial.println("ECU Reader"); / For debug use */ }

I had no luck using the demo code with the duemilanove and the NSS library. So I ported the code to the MEGA board and my problems are solved, no more hang-ups ! As suspected, the NewSoftSerial library is causing the sketch to behave strangely and my level of expertise doesn’t allow me to delve into the library code to see what’s wrong with it. My guess is a problem with resources and/or interrupts. I added a copy of my code for your testing: >>>>>>>>>>>>>>>>>>>>>>>
OOps, I appended my code here but the format looks awful. I have to find another way to add the code...

After extensive testing, I found out that my microSD problem has nothing to do with the SPI configuration. In the following code from the can_shield_test.pde demo program, if I remove the else{...} section in the: if(Canbus.init(CANSPEED_500)) block, it works fine. Strange…??? So I suspect it has something to do with the NewSoftSerial object (nss). I searched the nss online and found similar lockup problems with the nss. I need to do more testing with the nss. Anyone experienced similar problems ?
if(Canbus.init(CANSPEED_500)) /* Initialise MCP2515 CAN controller at the specified speed */
{
sLCD.print("CAN Init ok");
} else
{
sLCD.print("Can't init CAN");
}

I have a canbus_shield dated: 8/31/10 and noticed that D10 (SPI/SS) is used to select the MCP2515 via the CAN_CS line. This causes SPI bus problems when both the CANBUS and microSD are used in the same sketch, i.e., demo code. Any suggestions on how I can get both the microSD & MCP2515 working via the common SPI bus without bus issues ?

Hi all,
I have same problem with using of this shield.
Resistor 120R is fitted, but I still receive complete buffer with 0.
I try to use Canbus v.1 and v.2 same result
Thx for help
But I didn't use original OBD-II connector because on tested car there is only CAN in engine area so I think that I will check correct conection there tomorrow because now is here night...

Got it working with this Library / Sketch:
http://code.google.com/p/skpang/downloads/detail?name=Canbus_v2.zip
greetings Sunny

Got anyone a working Arduino Library for this shield? I´ve downloaded the one from skpang, it says "CAN Init ok" but i didn´t get any message back. taking a deeper look, mcp2515_check_message() always returns false. Don´t know why it doesn´t return a message. I´m connected it to a 2010 Volkswagon OBDII.

I would like to network three Arduinos over CAN-bus. How can this be accomplished with this shield?

• Power can supply to Arduino by sub-D via resettable fuse and reverse polarity protection.
  Does this mean that the Arduino can be powered by this shield from the +12V of the OBD interface? No external power needed?
  That's just awesome!

The schematics show a 16MHz crystal.
That is the most flexible clock rate for the MCP2515. The clock can be as low as 10MHz for 1Mbps CAN, but the receiver can do a much better sample with 16MHz.
Internally the chip divides the input clock by two to get a symmetrical internal clock, and then uses these time period to look for incoming signal edges. With only 5 time periods, the chip takes a single sample 3 ticks after the bit period start e.g. 60% into the bit period. With 8 time periods it can take three samples and use the majority count.
Higher clock rates allow finer-grained sampling, but this barely improves the error rate.
A MCP2515 controller is very easy to utilize with a prototype shield. I run my MCP2515 implementation off of a timer output set to "count to zero". This gives a 8MHz clock and a 500Kbps maximum rate -- the highest standard speed for automotive use, but less than the max 1Mbps rate used industrial and lab equipment.
If you are designing your own board, add in a jumper selectable 120 ohm terminator. With this board you could always solder it into the 4 pin header position, but that is inconvenient.
You probably also want to provide an option to use the interrupt output. My software uses polling mode for regular operation, but still needs the interrupt to allow the system to go into low-power sleep mode.
Finally, have you considered connecting to the ISP header? I think this gives the correct SPI pin wiring for most types of Arduino boards. The Chip Select and interrupt pin assignment will still vary, but those are easier to handle.

Setup a section in the Forum for CAN-BUS Shield. Copied some of the fixes & uploaded a working version of the JoyStick Demo.
Forum Link

Beginner Cry for Help!! - Got the UNO + CanBUS Sheild+OBD connector and sLCD
Not planning on using the GPS function just yet..ONLY the CAN
1. What software from SKPANG Sample Code do I load ? All of them or ...
2. Where do I load them ? All in the Sketch Folder Do I just drag and drop the hold CANBUS folder into the Sketch Folder?
3. Which File do I then compile/verify to be loaded into the UNO to kick things off?
I'm currently awaiting Massimos book Getting started w Arduino but decided to jump ahead...

It is possible baurate=1000Kbit/s ?
I only find in the sample code(Canbus.h):
"#define CANSPEED_125 7// CAN speed at 125 kbps"
"#define CANSPEED_250 3// CAN speed at 250 kbps"
"#define CANSPEED_500 1// CAN speed at 500 kbps"

Will PRT-09919 mate up to the LCD connector on this board?

I found a very interesting link at SKPang's website to Marco Guardigli's blog.
He told me he was able to read data like engine rpm and temperature from an Audi A6 but he couldn't get any data from different cars like VW Fox and Mercedes E270.
Does anyone know something about this issue?

http://code.google.com/p/canduino/
Shameless Plug!

The features list a "9-way sub-D standard OBDII connection cable". Is this included? Your pictures are usually pretty clear as to what you get and what you don't.

Have you guys considered a "Coming soon!" page? I have a PCB on it's way from BatchPCB to build my own shield. I would have saved myself all this effort if I knew you guys were on it. I have an MCP2515 Arduino Library that I'm working on, unless you want to post some code for that too? :D
Is that a male or female sub-D?
And a word of caution about OBD-II. It is my understanding, (and I could be wrong), that OBD-II is not necessarily CAN based until 2008 model vehicles, (in the US at least).

Presumably the Arduino communicates to the shield via the SPI Interface pins.
So Is there any sample Arduino code for this shield?
This shield has a mini Joystick & Serial LCD pins - this would require Arduino code to use these yes? or is there Software already loaded on the board to use these devices?

CAB-10087 was specifically sourced for this shield.

it may compatible with CBL-10087 OBDII to DB9 Cable (products_id=10087)
this products pins 2,3,5,9 are compatible with obdii cables pins
is this true?

Hello everyone, I just started using this CANBus shield but I'm having lots of trouble in using the demo code from the SK Pang Site. It doesn't compile and I can't find the reason why. I tried to use the canduinoV2 library but it doesn't compile either. It says that 'CAN' was not declared in this scope and the library can.h is included :/

I just need to setup a simple network between two shields using two Arduinos UNO. Can anyone post or send/post a library and a simple Arduino sketch that works and allows to send a simple message and to receive it ? I would be very thankful. Thanks