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[on:]

Last month I bought a CAN shield from Sparkfun in order to display gas mileage statistics in realtime for my OBD2-compatible car.  I could not find a CAN library the did what I needed written in English, so I decided to write my own from scratch.  I thought I would share it, in case it might be useful to anyone else.

The library has the following functions:
static boolean initCAN(int baudConst);
static boolean setCANNormalMode();
static boolean setCANReceiveonlyMode();
static boolean receiveCANMessage(CANMSG *msg, unsigned long timeout);
static boolean transmitCANMessage(CANMSG msg, unsigned long timeout);
static byte getCANTxErrCnt();
static byte getCANRxErrCnt();
static long queryOBD(byte code);

It includes a tested example to display miles per gallon on an LCD display (I have been using this in my car for the past several weeks).

https://github.com/franksmicro/Arduino/tree/master/libraries/MCP2515


Frank

[Reply #1 on:]

I offered my MCP2515 library to Sparkfun, but they never posted it.

Mines strictly CAN though, no OBDII.  Going to take a peek at yours to see what you've done on the OBDII side.

[Reply #2 on:]

Cool franksmicro!!

I´ve been tinkering with CAN bus for a while.....

http://real2electronics.blogspot.com/2010/06/can-bus-mcp2515.html

I´m sorry,it´s in spanish. It´s not a proper library, it´s an explanation how to use MCP2515 and the basic functions needed.
I´ve some links to code and hardware.... I´ve just added a link to your library!

DaveAK, if you also have a library, please let me know the link and I could add. There are no many projects with CAN bus and Arduino.


I did this...
[media]http://www.youtube.com/watch?v=CZGxynxNAlM&feature=player_embedded[/media]










 

[Reply #3 on:]

Igor, I like your LCD display!  Bet its expensive though.  I have the Sparkfun Nokia knockoff as well, but it is too small to display multiple parameters at a time so have not used it with OBD.

[Reply #4 on:]

Hi,
I've used a NewHaven Display => www.newhavendisplay.com/
It's very big and cool!!!!  ;D  I don't remember, but something less 70 dollars.
I've choosen one based on T6963 controller. I bought directly from this web.

It's very cool!!

Regards,


 

[Reply #5 on:]

Igor, I don't have my code posted any where yet.  I'll see about getting it up on google code or something like that.

[Reply #6 on:]

DaveAK, I'd be interested in your code too, I'm working on an CAN Arduino project and some code would be beneficial.

[Reply #7 on:]

So as not to hijack Frank's thread, I've posted my code over on the thread I started a few weeks back:

http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1289195675