VPW interface to Microcontroller to LCD?

[okidedrak]

Has anyone attempted such project?
If yes, details please, if not who knows what would be required?

For example to simply display a DTC on a LCD?


Also does PCM edit work with Alex Pepper's interface from obd-2.com? I didnt get a chance to try it yet..

[okidedrak]

did you guys know about this?

http://home.t-online.de/home/O_Scholz/flexscan.html

its not what i'm lookign for but it's interesting nevertheless

[jfunk]

To just display the DTC's some of the main things you would need would be:

1. VPW transceiver IC
-Or get a microcontroller with a VPW module
2. Microcontroller IC

3. LCD module

4. Write the firmware code to request and then display the DTC's on the LCD

here's an APP note from motorola for interfacing the MC68HC705C8A to an LCD module.
http://e-www.motorola.com/files/micr...ote/AN1745.pdf

There's lots of circuit and code info about interfacing microcontrollers to LCD modules on the web.

[okidedrak]

1-ELM322 or MC33390(and similar)
2-many can be used
3-easy to get, i got one

1-is not a problem, i for one got teh Alex Pepper interface i assume it will work
2-programming this to work with the above...no idea about coding especially not for this application
3-interfacing this is no problem

anyone willing to dig deeper into the project?
I dont believe there is someone here who wouldnt want to see misc sensor readigns while driving ....

[Keith@HPTuners]

I'll e-mail alex and ask what the packet format is.

[Tyrithe]

Something else might be to use a mc33390 with one of Motorola's HCS12 micros. They have a module on them that is a BDLC. Might make the interface to the bus a little easier. Would also be expandable for high speed. A bit overkill if it will only ever be for reading trouble codes though.

Working along these lines myself at the moment.

[okidedrak]

Magnus, any word from Alex?

[Keith@HPTuners]

Yeup. I have some info. We're going to have to work together though and do some testing if you want to be able to use PCM Edit with your cable.

Drop me an IM with times your available.

[Keith@HPTuners]

Ok.. I have to write code to calculate the CRC which I just don't have time to do right now. When I do however I will upload the new PCM Edit version.

Thanks!

FYI... I'm not really sure on this but I believe Alex of obd-ii uses multiplex hardware, so I am setting up the formatting under the multiplex option.

[okidedrak]

I dont believe so , the circuit board on his interface is very small and very simple , it does not look at all like the multiplex ones plus it uses a pic 12C56B which he probably programmed with his own code.