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keydiver
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Re: Navi safety override?

Wed Apr 04, 2012 8:15 pm

bdl99 wrote:Some Nissan vehicles also have an auxiliary audio/video input (the three RCA jacks; Yellow, Red and White) but I don't think the Leaf does. Having said that I have been be able to create a kit for some Nissan's that don't have the Aux input to add them. I would have to look at the leaf wiring diagrams in more details if this is something that might be of interest.


Yes, I'm sure there would be some interest. :D Information on this Clarion head unit is hard to find, so any info you have on unused pins/inputs would be sweet. Or, details on how to get the Leaf to read video files from the USB would also be interesting.
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garygid
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Re: Navi safety override?

Wed Apr 04, 2012 8:59 pm

Watching a movie off the USB flash drive while quick-charging.

I like that.

When you get something to play properly, please let us know the necessary parameters, and perhaps a good way to convert a movie to that format.

Thanks.
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Re: Navi safety override?

Wed Apr 04, 2012 9:04 pm

Has anybody tried "inserting" a "low-speed" pulse train, to make the car think that it is still moving, but slowly?

What speed is slow enough to activate the menus, maybe 1 or 2 mph?

At that "fake" speed, is the GPS positioning still active?
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TonyWilliams
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Re: Navi safety override?

Wed Apr 04, 2012 9:45 pm

garygid wrote:Has anybody tried "inserting" a "low-speed" pulse train, to make the car think that it is still moving, but slowly?


What advantage does this have over no signal? Both will inhibit an accurate position.

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garygid
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Re: Navi safety override?

Wed Apr 04, 2012 9:50 pm

The "low-speed" signal might allow the GPS to continue to work, keeping the LEAF's indicated location on the map up to date.
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Re: Navi safety override?

Wed Apr 04, 2012 9:55 pm

Maybe... The accelerometers still work with the inhibit. It will show turns, just not an accurate
position.

I think the threshold is about 4mph. So, we need to copy the signal at 3mph, make a loop of that speed, and when you throw the inhibit switch, it feeds the 3mph data.

Now, how do you do that?

One way to test would be to remove the wheel speed sensor assembly, place a motor that will rotate it at 3mph while you motor along at 60mph.

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Re: Navi safety override?

Wed Apr 04, 2012 11:06 pm

1. Cut the wire and bring out both ends, as if you are adding a switch. At the same time, bring out a Ground (and 12v if relatively easy).

2. Use a scope (inverter or battery-powered) to measure the pulse shapes, and frequency, at the Menu-enabling speed.

3. Connect a "slow-speed" pulse generator th the Nav input and test out the GPS and LEAF function at higher speeds.

4. Try switching between the "real" and "low-speed" signals.

5. If it all works, make a small circuit to generate the "low-speed" signal, and wire it and the "real" signal to a SPDT switch.

6. Presto!
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Re: Navi safety override?

Thu Apr 05, 2012 12:29 am

garygid wrote:1. Cut the wire and bring out both ends, as if you are adding a switch. At the same time, bring out a Ground (and 12v if relatively easy).
!


I've got all that, including the 12v from the 120w accessory port to run my "override" warning LED.

I can bang this out pretty quick on your car, if you want. You handle the pulse generating.

bdl99
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Re: Navi safety override?

Thu Apr 05, 2012 4:34 am

garygid wrote:Has anybody tried "inserting" a "low-speed" pulse train, to make the car think that it is still moving, but slowly?

What speed is slow enough to activate the menus, maybe 1 or 2 mph?

At that "fake" speed, is the GPS positioning still active?


This is something that has been on my list for a while and like the way you are thinking. Really the only thing stopping me has been other priorities, the fact that it would be much easier with a second pair of hands and finally I'm not sure it is going to work for reasons below:

What I know:
-Within the software there is a binary flag that is toggled between not moving and moving and that activates at ~5mph.
-The navigation system applies the logic of; if the car isn't moving then don't bother updating the map.

The question:
-Does the navigation system use the binary flag to determine if the car is moving or the speed sensor?

If it uses the flag, then the inserting a pulse idea will make no difference. If I was writting the program I would use the binary flag but we can hope the developers didn't take that route.

One simple (or many be not so simple) test would be to drive at 2-3 mph with the map zoomed right in and see if the map location updates. Of course it is difficult to be sure that you may not be going just a little too fast and activating the moving flag.

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Re: Navi safety override?

Thu Apr 05, 2012 4:38 am

garygid wrote:Watching a movie off the USB flash drive while quick-charging.

I like that.

When you get something to play properly, please let us know the necessary parameters, and perhaps a good way to convert a movie to that format.

Thanks.


I will dig out my notes from when I did this, after I added the Aux AV input on my car (not a leaf) there was no need to use the USB approach so I haven't done this in a while.

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