DaveNagy
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Location: Livermore, CA (Nor-Cal)

Re: My findings on the CAN bus

Sat Feb 26, 2011 4:51 pm

I'm enjoying watching progress being made, even when it isn't. ;) Keep up the good work.

I'm sorry to hear that your "re-purpose an existing display" scheme isn't working for you so far. Are the clock and temperature gauges pretty much the only ones that had potential?

Regarding the "install an external display" plan, I still would like to have the option of using the display that I already haul around every day: My smartphone. "Need to see your SOC? There's an app for that."

Also, if one was able to get certain data into a smartphone or tablet, wouldn't it then be possible to pipe that data onto the Leaf's nav display, perhaps as an RSS feed or something? It seems silly to have to send that info through the internet and two separate cellular connections, but it might work in a pinch. Maybe.

But a "dumb" display wouldn't be bad either, and would have a lot less dependency on user-supplied gear and software. Would you be able to use one of the many existing "OBD-II gauge" products, and feed it some suitably massaged data?

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garygid
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Re: My findings on the CAN bus

Sun Feb 27, 2011 9:13 am

Sorry, I mean XY.Z (00.0 to 24.0) displayed in the peculiar XY:0Z format for kWh, or perhaps use 0.0 to 25.0 for 1/4 of the "percent SOC" value, just so we can watch a "high-precision" value and get some experience with it.

When you cycle that center display to other data, miles per kWh is shown, right? That would display a Y.Z or XY.Z format, right?
See SOC/GID-Meter and CAN-Do Info
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turbo2ltr
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Re: My findings on the CAN bus

Sun Feb 27, 2011 9:30 am

The average m/kw on the dash is calculated by the dash as far as I know so it's not overrideable.. I know my number never matches the average on the Nav system.
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turbo2ltr
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Re: My findings on the CAN bus

Wed Mar 02, 2011 8:40 am

I found that the buttons for the NAV have their own CAN bus. I haven't tried yet (well haven't tried hard), but in theory I should be able to emulate button pressing. Unfortunately, I cannot emulate the "I agree" button press on the screen which is what we really want. But it would be nice to have something that selects the power screen automatically, which I'm quite sure is doable. The problem is doing so will is essentially the same thing as pressing decline. So it would only work if you don't care about carwings data getting uploaded.
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evnow
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Re: My findings on the CAN bus

Wed Mar 02, 2011 8:49 am

On the nav screen - what I really want is a "recall" button. I toggle between the music screen and the energy utilization screen.

While Leaf displays the track it is playing at the bottom of the map, it doesn't do that for the EV screens.
1st Leaf : 2/28/2011 to 5/6/2013
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turbo2ltr
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Re: My findings on the CAN bus

Wed Mar 02, 2011 8:56 am

evnow wrote:On the nav screen - what I really want is a "recall" button. I toggle between the music screen and the energy utilization screen.

While Leaf displays the track it is playing at the bottom of the map, it doesn't do that for the EV screens.
I misspoke. There's no way to get to the energy screen using buttons alone....typing before thinking is never good.
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evnow
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Re: My findings on the CAN bus

Thu Mar 03, 2011 7:24 pm

turbo2ltr wrote:What we do know is that this number I found is the basis of the range calculation. So one would think that as capacity drops, so does the range, therefore so must this number, which would seem to indicate that this is not SOC but capacity. But, that all depends on which module is compensating for loss of capacity. More tests!
Any news ?

BTW, instead of time to charge you could use one of the other stats Leaf can show in the same place - like Avg speed.
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turbo2ltr
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Re: My findings on the CAN bus

Thu Mar 03, 2011 9:26 pm

Nothing yet. Been super busy. I did get a display in that I plan to use...details are still sketchy.

Everything on the dash LCD (aside from charge time) as far as I can tell is calculated in the dash itself so there is no direct CAN message to override. I did do some testing and it does not appear overriding would have worked anyway. I tried to override the range with SOC and it would continously flash back and forth. I originally had reason to believe there was some delay in displaying the message that would have let it work, but that does not appear to be the case.
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Spies
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Re: My findings on the CAN bus

Sat Apr 23, 2011 10:47 pm

Looking forward to your CAN bus findings once you have the update on your Leaf done. As far as the update goes
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turbo2ltr
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Re: My findings on the CAN bus

Sat Apr 23, 2011 10:53 pm

I dont plan to get it done. Currently testing with someone elses car..
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