[Ovmsdev] OVMS TPMS on Tesla Roadster - New Jersey area

[Mark Webb-Johnson]

Brian,

Problem is memory in the PIC18F. It is tiny (a couple of KB of RAM and EEPROM). Nowhere near enough to store a stream of can bus data.

We could conceivably stream it over a GPRS data connection - so long as the connection was stable that might be workable, but I doubt whether it could stream at more than 9600baud or so so we're gonna lose a lot of data.

From the wiring point of view, it is three / four pins, so should be possible to just tap those.

Regards, Mark.

On 30 Apr, 2013, at 12:46 PM, HONDA S-2000 wrote:

> I am very interested in this bit of hackery, but I am in Seattle.
> 
> Would it be possible to have the OVMS passively record CAN bus activity? My plan was to (some day) look at the OVMS source, figure out a way to turn it into a very short-term CAN bus recorder, and set it to record for the duration of the TPMS tool usage. I'm not really sure how feasible that would be, but it seems possible.
> 
> I assume that the PVMS might need to be wired in differently than it currently is, such that the TPMS tool would still be able to be attached at the same time.
> 
> I don't even know which CAN bus the TPMS tool attaches to, or whether the OVMS can access that bus, so there's quite a bit of hand-waving on my part at this juncture.
> 
> Brian
> 
> 
> On Apr 29, 2013, at 21:32, Mark Webb-Johnson wrote:
>> We've got some users interested in looking at the CAN bus activity for the TPMS tool. The work will be in the New Jersey, USA, area.
>> 
>> The users doing the work are experienced with Tesla and OVMS, but not developers and don't have any CAN-USB tools.
>> 
>> Is there anyone in New Jersey with a CAN-USB adaptor, knowledge to tap the car bus, and time?
>> 
>> Regards, Mark.
> 
> 
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