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Next Project: GT-R MFD on 370 (oil temp/pressure, boost, etc...)

Well... this is nice.

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Old 11-30-2022, 11:25 PM   #16 (permalink)
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Well... this is nice.
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Old 12-01-2022, 08:27 AM   #17 (permalink)
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Originally Posted by MotorvateDIY View Post
Well... this is nice.

Curious about the dimensions on the MFD. wonder if it could fit in the cubby space for those of us with non-nav cars


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Old 12-01-2022, 11:56 AM   #18 (permalink)
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Curious about the dimensions on the MFD. wonder if it could fit in the cubby space for those of us with non-nav cars
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The factory Nav screen is only usable with the nav unit, as it uses a special 2 wire video interface called GVIF (gigibit video interface)

The visible screen is 7" (measured diagonal) with an outside dimensions of: 7" x 4.5"

At Gregory Brettin's request, I am looking into developing a stand alone 7" LCD screen for his custom "fibreglass cubby screen holder" (my words, not his!)

Driving a large 7" display with a microcontroller is a little challenging.
In order to get 30 frames per second for a smooth display, it requires a data rate of 5.76 million bytes per second (@ 4 bits/colour)

Yes, you could use a Raspberry Pi, but I *hate* the 20-30 second boot up EVERY TIME you start your car.

A microcontroller start up is less than 1 second when you have a 1 second splash screen. (Meaning it is almost an instant start up)

Development of the 7" gauge display will start in the new year.
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Old 12-01-2022, 12:40 PM   #19 (permalink)
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Originally Posted by MotorvateDIY View Post
The factory Nav screen is only usable with the nav unit, as it uses a special 2 wire video interface called GVIF (gigibit video interface)

The visible screen is 7" (measured diagonal) with an outside dimensions of: 7" x 4.5"

At Gregory Brettin's request, I am looking into developing a stand alone 7" LCD screen for his custom "fibreglass cubby screen holder" (my words, not his!)

Driving a large 7" display with a microcontroller is a little challenging.
In order to get 30 frames per second for a smooth display, it requires a data rate of 5.76 million bytes per second (@ 4 bits/colour)

Yes, you could use a Raspberry Pi, but I *hate* the 20-30 second boot up EVERY TIME you start your car.

A microcontroller start up is less than 1 second when you have a 1 second splash screen. (Meaning it is almost an instant start up)

Development of the 7" gauge display will start in the new year.
Hey Frank, will the 7" LCD screen you're developing for Greg's cubby screen holder be the wireless set up you're testing that will have the the main controller in the engine compartment?
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Old 12-02-2022, 07:50 AM   #20 (permalink)
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Hey Frank, will the 7" LCD screen you're developing for Greg's cubby screen holder be the wireless set up you're testing that will have the the main controller in the engine compartment?
The only item under the hood will be the Bluetooth Sensor server. It will send the oil pressure (with support for 7 additional sensors) to the module/display inside the car.

As much as possible, the same hardware and code will be used to drive the 7" display. Since the display has its own "GPU", the load on the main microcontroller will be reduced, but the graphics will need to be recreated from scratch.
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Old 12-02-2022, 10:28 AM   #21 (permalink)
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Originally Posted by MotorvateDIY View Post
The only item under the hood will be the Bluetooth Sensor server. It will send the oil pressure (with support for 7 additional sensors) to the module/display inside the car.

As much as possible, the same hardware and code will be used to drive the 7" display. Since the display has its own "GPU", the load on the main microcontroller will be reduced, but the graphics will need to be recreated from scratch.
Perfect, I'll need support for 6 sensors. I'm getting one of Greg Brettin's first cubby display holders
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Old 12-02-2022, 11:10 PM   #22 (permalink)
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Perfect, I'll need support for 6 sensors. I'm getting one of Greg Brettin's first cubby display holders
For planning purposes, what are the 6 sensors?
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Old 12-03-2022, 01:02 AM   #23 (permalink)
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For planning purposes, what are the 6 sensors?
Water temp, oil pressure, fuel pressure, wideband, boost, ethanol content. Fuel pressure is the only one I'm not monitoring currently. All others have aftermarket sensors
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Old 12-04-2022, 08:55 AM   #24 (permalink)
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Water temp, oil pressure, fuel pressure, wideband, boost, ethanol content. Fuel pressure is the only one I'm not monitoring currently. All others have aftermarket sensors
I've made a note.

I have also found a really nice hi-res (1024 x 600 vs stock screen of 800 x 480) 7" touch screen and it is made in North America! (Calgary, Canada)
I've got some more research to do, but I think this is the best option so far.
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Old 12-04-2022, 10:16 AM   #25 (permalink)
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Originally Posted by MotorvateDIY View Post
I've made a note.

I have also found a really nice hi-res (1024 x 600 vs stock screen of 800 x 480) 7" touch screen and it is made in North America! (Calgary, Canada)
I've got some more research to do, but I think this is the best option so far.
Great news Frank. Looking forward to seeing what you come up with
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Old 12-10-2022, 11:18 PM   #26 (permalink)
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For those that have the stock Nav system, here is a nice little update on the GTR gauges.
https://youtu.be/wFDc3bvv3X0
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Old 01-06-2023, 05:19 PM   #27 (permalink)
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(Mods: Could you please move this thread over to "Audio/Video"... I don't know why I posted it here!)

January Update:
Today was the first "in car" test of the reconfigured navigation unit and it worked as expected!
This means that 5 out of ~28 gauges worked as is.
With the CAN bus module (under development) an additional ~22 gauges will display live data.

Also, since this works on the G37, it will also work on the 370, as long as you have the factory navigation.
On my test bench I have reconfigured the same AV/Nav unit to be from a Murano, 370, G37 and GTR without any issues and the GTR gauges work.

Anyways, that's all for now.
I hope to have another update in a few weeks the most of the gauges working

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Old 01-19-2023, 02:30 PM   #28 (permalink)
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Small GTR Gauge update:
The GTR has a gauge labelled "Transmission Oil Pres", which isn't that useful on the 370.
BUT, wouldn't it be nice to have something else in its place? Maybe something like fuel pressure, ethanol content, or differential oil temp?

Well....thanks to Gareth for the checksum calculation, any gauge text can now be changed.

In the example below, the TRANS OIL PRES has been changed to DIFF OIL TEMP.
This gauge will be fed from our Bluetooth sensor server, which will send the diff oil temp to the AV unit/MFD for live data display.

The only down side is that the gauge doesn't have and numerical values, BUT the gauge is divided into 10 sections, which works.
For example the top middle of the gauge (50% area) could be used to indicate 80C/176F and every section (10%) could indicate 10C / 20F.

I'm still working on the development the CAN bus converter so these gauges can show live G37/370z data and hope to have an update in a few weeks.

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Old 01-19-2023, 08:33 PM   #29 (permalink)
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Noice.
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Old 01-25-2023, 08:14 AM   #30 (permalink)
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Update:
I can now take "screen shots" of anything that is on the nav display and saves it on a USB device.
So... here are a few screen shots of some new menu items:


YES, the tire pressure screen can be easily turned on!!
It is kind how odd that the wheel positions are not labeled.
BUT through testing it looks to be (from top to bottom) front left, front right, rear right and rear left.
Just think about getting out of the car, and checking your tires in a clockwise direction.

Also, there is a "Trip Computer"... not really all that interesting, but some may like it. (I do!)

That's all for now!
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