J1939 Interfacing to PIC microcontroller

[csr1981]

J1939 Interfacing

I want to interface the J1939 signal coming from a ECU to display unit which will display the parameters broadcasted on the j1939 bus.
In the display unit i am using a PIC 18F458 microcontroller.

Anybody with the knowledge please help

 

[bobcat1]

Hi

There was several Elektor project for interfacing the CAN bus (J interface)

Go to elektor site : www.elektor.co.uk to learn more

All the best

Bobi

The microcontroller specialist

 

[csr1981]

Hi Bobi,

I visited the site, but the site was opened in domain caontaining site UK reg.
Could not find any thing useful there.

Please help.

Thanks

Best Regards
Chetan

 

[bobcat1]

Hi

Yes , The address has bean change:

try : www.elektor.com

All the best

Bobi

 

[csr1981]

Hi Bobcat

I tried to find on the elektor site but could not get anything useful.

Can you help on this.

Thanks.

 

[csr1981]

Hi funnynypd,

Thanks for the info.

But i want the actual hardware implementation and not the end product.

 

[eziggurat]

Take a look at this website if you want to **** the bus, **broken link removed**. Also buy the J1979 specification.

To interface to the OBDII, all you need is just a CAN transceiver and connect to your micro. I believe there is CAN stack for the PIC. To talk to the J1979, all you need is to send standard ID CAN packets to request the data or decipher the data as suggested canbushack. Usually cars with J1979, data is usually spit out from the ECU so you don't need to request some of the data such as speed, fuel, gear, rpm. All you need is setup your code to check the ID. As for the odometer, you might have to scan the bus as suggested by the canbushack website but sometimes the odometer in some cars are found in the VPW bus (some GM cars still uses both VPW and J1979).

---------- Post added at 02:31 ---------- Previous post was at 02:30 ----------

Check this website as well, https://www.sterntech.com. There have the source code for PIC and AVR.