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Author Topic: Real Instrument Panels  (Read 22598 times)

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Howard_Casto

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Real Instrument Panels
« on: March 14, 2013, 02:56:26 pm »
Ok so I mentioned this to RamJet, but I thought I might post it here in case some of you are gear heads and can add some info. 

I was searching the web last night and ran across this usb adaptor (actually it's a usb to serial port dongle)  for bmw instrument clusters for racing sims.  Apparently the whole cluster runs on a serial line?  Who would have guessed? The problem with that of course is it's bmw.  So if you want to pay 300-600 bucks for a rpm/speedo for your fake car knock yourself out. 

My question is are there any other cars that use a serial based cluster?  On ebay right now you can get NOS or gently used clusters for as little as 30 bucks.  It's just they are usually from a Grand Prix, Taurus or Saturn.  If we could find a serial cluster that's affordable I'd be willing to do some of the heavy lifting in terms of figuring out the serial protocol. 

Of course there is always the option of using an analog cluster, but then you need a avr with a buttload of analog pins, so you've essentially added 50-75 bucks to the cost of the project. 

mcseforsale

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Re: Real Instrument Panels
« Reply #1 on: March 14, 2013, 03:29:39 pm »
You need to research the CAN bus, which most euro OBDII have been switched to. 

http://en.wikipedia.org/wiki/CAN_bus

AJ

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Re: Real Instrument Panels
« Reply #2 on: March 14, 2013, 03:39:21 pm »
Thanks for the link, I'll look into this. 

Would the CAN bus even be relevant for American panels though?  The strange thing about cars is American cars generally get exported to the UK, but not many UK cars get sent back over to the US  (except bmw of course).  So for it to be cost effective for everybody on byoac we'd probably have to use a rather common brand of car, like a Ford, Chevy, Toyota, ect....  Also of course I want a gauge in mph, not kph.  ;)

mcseforsale

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Re: Real Instrument Panels
« Reply #3 on: March 14, 2013, 03:42:38 pm »
Yeah, it's a standard.  Basically, like LAN standards are (such as IEEE stuff).  And, since most auto manufacturers take bids for their OBDII compliant devices, this bus is usually used as part of, if not most, of the communicado between different subsystems. 

For instance, Hyundai/Kia use and entire Bosch computer management system and some of the parts are probably identical to parts in a Corvette. 

AJ


Thanks for the link, I'll look into this. 

Would the CAN bus even be relevant for American panels though?  The strange thing about cars is American cars generally get exported to the UK, but not many UK cars get sent back over to the US  (except bmw of course).  So for it to be cost effective for everybody on byoac we'd probably have to use a rather common brand of car, like a Ford, Chevy, Toyota, ect....  Also of course I want a gauge in mph, not kph.  ;)

RamjetR

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Re: Real Instrument Panels
« Reply #4 on: March 14, 2013, 09:12:44 pm »
Hi all,

Actually I missed this thread until after replying to you Howard. Does it need to be serial? There are plenty project documents on Can-bus sheilds for arduino. Sending and receiving through the library would be alot easier then trying to fake the signals if they were in native Can-Bus.

Some links

http://www.seeedstudio.com/wiki/CAN-BUS_Shield

https://www.sparkfun.com/products/10039



Also with ODBII interfaces, it is now possible to use X-Sim to receive and actually generate ODBII signals for real onboard diagnostic data and dashboard display with a suitable Bluetooth adaptor for $15.

On the subject of X-Sim, it's component Dash Gauge design has brilliant output for additional LCD screens if you want to make a dash for your simulator.

A brief summary of my experience making my dashboard;

It comes down to cost. How much your willing to spend on dashboard you'll likely never look at. I've spent perhaps $135AUD per dashboard to display RPM, Shift, Gear and speed in addition to fuel level, temperature, tire and track warnings...

Symprojects.com do a great range of devices to either hack an old analogue gauge or make your own new ones. I own the SPI-D, Pro-Shift and Gi-Pro Gear indicator. The Symdash program works well for all PC racing titles which support telemetry output. And it reads memory locations of some that don't.

I've written a basic interface for outputting the speedo and gear info from Model 2 games to my dashboard but that is a side project which was a by product of working on Model 2 outputs last year. You can see any of them working in my Youtube channel (see sig below).

As for putting a real dashboard in? It's a lot of work, and probably something you'd take on only if you really really want the illusion of a real car dashboard.

If I were to do the dashboard installation all over again with my cabinets and simulator setup. Buy the cheapest 7" Android with Wifi you can buy and download the simdash DashMeterPRO https://play.google.com/store/apps/details?id=com.sensadigit.dashmeterforiracing&feature=search_result#?t=W251bGwsMSwyLDEsImNvbS5zZW5zYWRpZ2l0LmRhc2htZXRlcmZvcmlyYWNpbmciXQ..

It will work better, and with a little skinning can look like the dashboard of any car your driving... plus it's got a touchscreen! I can get a 7" Android 4Gb +Wifi which will do this for $79AUD and thats alot cheaper than the $135 I spend on symprojects gear...

Thats my experience with simulator dashboards though...
Gentlemen.... Start your engines!
My Youtube Channel http://www.youtube.com/user/ramjetr?feature=mhee
Try my RamjetM2Borderless V0.7 utility for your M2Emulator shooting games here https://docs.google.com/open?id=0B-P3wlCiYEm3RzhCZk1NcFR3blE
Try my Sega Model 2 Output Utility RamjetVR V1.4 https://docs.google.com/file/d/0B-P3wlCiYEm3VHhBMXNxZGVIQk0/edit

Fursphere

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Re: Real Instrument Panels
« Reply #5 on: March 14, 2013, 09:32:06 pm »
oops, double post.
« Last Edit: March 14, 2013, 09:34:27 pm by Fursphere »

Fursphere

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Re: Real Instrument Panels
« Reply #6 on: March 14, 2013, 09:34:02 pm »
I was thinking of doing this to my cab.  I wouldn't be directly related to game play, but at least it wouldn't be a static sticker....




Apparently this guy figured it out...



And this guy...


Howard_Casto

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Re: Real Instrument Panels
« Reply #7 on: March 14, 2013, 11:47:33 pm »
I think the cost really depends upon what kind of cluster you use. 

There are three Saturn clusters on ebay right now for 30 bucks with free shipping.  Many might say things like "that doesn't go past 100 mph, ect." but it would be virtually free to scan the display and print out one that goes higher.   

Your real cost is the interface. 

Certainly a serial connection isn't a requirement, but the gauges have to at least be digital. 

Here's my train of thought on this one.....  The avr route is certainly a good one, but the more complex the signal you have to send the more custom programming you have to do which makes it offputting for other people (trying to get a system in place for everybody, not just something for a personal project).  Store bought AVRs certainly make things easier, but as you pointed out, it really ups the cost of the project. 

So a parallel port interface would be cheapest.  I know you are thinking that's outdated tech ect, but they do make usb adaptors like so:

http://www.ebay.com/itm/150938418139?hlp=false

Yeah that costs a whole three bucks. 

Even if the entire harness isn't serial, so long as the individual instruments are, it should be more than sufficient.  I know for a lot of speedos/odos you simply "flicker" a pulse to the gage.. the faster the pulse, the higher the value.  So essentially you need one data line per gage. 

The parallel port has 8, so that's enough for:
Speedometer
Odometer
Rev Light
Temp Gage
Fuel Gage
Left Turn
Right Turn

And one bonus.  Or if you want a simpler setup you can just do the speedo/odo and a rev light and have 5 outputs left over for vr buttons and a start button. 

Of course all the gages have to operate at low voltages.  If it's a 12v signal system, that complicates the build to the point of where symprojects stuff seems more cost effective.

Also if you want a shift number indicator that isn't enough outputs, but I never got that anyway.  Can't you tell what gear you are in by looking when you shift?


So what I'm really needing is a source of cheap instrument clusters that everybody thinks looks nice and have low voltage digital controls.   I'm not very knowledgeable in the auto parts department so I can't look at a random dash on ebay and say "yup that will work". 


If we go for this very generic implementation I can probably make things universal with a simple calibration routine (adjust this setting until your rpm reads 10x100 ect...)

Fursphere

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Re: Real Instrument Panels
« Reply #8 on: March 15, 2013, 12:55:04 am »
So..  for 12v, I would think the PC power supply is more than capable of providing enough to drive the gauges (maybe not a shift light... but maybe with a capacitor?)

And for digital guages...

http://www.summitracing.com/search/department/gauges-accessories/part-type/gauges-digital

Race cars generally don't have clusters - they have individual gauges.  Summit is expensive - probably find them cheaper elsewhere.

Howard_Casto

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Re: Real Instrument Panels
« Reply #9 on: March 15, 2013, 02:13:20 am »
I think you are confused as to what I was asking. 

You linked to gauges with digital DISPLAYS.  I mean a gauge with a digital INTERFACE (the gauge display can still be analog or you can go with digital, your choice).

Also by low voltage, again, I mean the voltage to the interface, not the lights/motors/ect on the cluster.  In other words the signal to control the gauges needs to be in the range of around 5v.  Some of the older ones probably work on a 12v system so they wouldn't work without relays and/or transistors. 
 

Yeah I know that race cars generally have individual gauges, but you've just upped the cost of your project by a factor of 4 if you go that route.  I guess you guys are thinking GT, I'm thinking outrun.  ;)  Anyway, most cars have individual gauges in their clusters, you'd just have to pull/cut them out and maybe put a trim ring around them.  Of course if you can find an aftermarket "racer" replacement it would work with the interface as well. 


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Re: Real Instrument Panels
« Reply #10 on: March 15, 2013, 08:58:19 am »
At one point in time, most gauges were just 12v voltmeters and the sensors were just variable resistors that reacted to heat or pressure.
If you could find a cheap source of 5v voltmeters, you could toss them behind one of the overlays they sell on ebay or print your own.
I would think you'd be able to adjust them by pulsing the voltage.  Analog adjustment of voltage from a PC is a PITA as far as I've been able to tell.

I think the app RamjetR linked to looks pretty sweet.

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Re: Real Instrument Panels
« Reply #11 on: March 15, 2013, 11:19:27 am »
I think you are confused as to what I was asking. 

You linked to gauges with digital DISPLAYS.  I mean a gauge with a digital INTERFACE (the gauge display can still be analog or you can go with digital, your choice).


I knew what you meant - I guess I was just putting a higher dollar amount on the project than you were.  :)   I've got ~$1,000 into my driving cabinet already, another $100 wouldn't be horrible.  (same for my standup cabinet actually).

So are you just doing memory scans to identify the variable for the speed (and other things), then translating that to the gauge (system) basically?  Or do some of the simulators have that information output (in some format) already?

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Re: Real Instrument Panels
« Reply #12 on: March 15, 2013, 01:08:54 pm »
This is all way over my head but its looks awesome!

well worth the expenditure. its got to increase the value of the cab?

Howard_Casto

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Re: Real Instrument Panels
« Reply #13 on: March 15, 2013, 03:44:52 pm »
Fair enough fursphere.  The way I look at it is if the device is useful, spend as much as needed.  On the other hand if it's useless (like this decidedly is) spend next to nothing and save your money for the important stuff. 

BadMouth:  I looked into the app RamJet linked to and it's entirely possible that I'm missing something, but there are multiple versions of it for each sim engine, around 6 in total.  Each one is 7-8 bucks as well.  So by the time that you buy all of them you might as well look into real gauges as you are entering their price range.  I do like the concept, but perhaps that particular app isn't the best one. 

Also on the client end of things I'm going to have to write something possibly for the model 2 stuff and most definitely for outrun 2006.  X-sim looks like the ideal solution software-wise, but I'm not sure if it can handle all the hackery I do to get things working.  I"ll have to look into it, but regardless we can probably make whatever physical interface x-sim compatable as well so you can use it for my software and x-sim. 

5v voltmeters might work I'll look into it, but I think they are decidedly analog.  Something that expects a digital signal (in the case of speedos a square wave pulse) is easy to calibrate... not sure about something that doesn't. 

Howard_Casto

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Re: Real Instrument Panels
« Reply #14 on: March 15, 2013, 05:48:54 pm »
Ok in the realm of vu meters I checked my favorite "crappy Chinese product" website they've got a variety of vu meters. 

I liked this one myself

http://dx.com/p/as-current-flow-vu-meter-500ua-7057

2.84 shipped... you rally can't get much cheaper than that... this seems even too cheap for me.  ;)  They are typically odd shaped or small.  You'd just about have to rip it apart, put a bigger needle on it and make a new face.

If a VU meter is used though, it might be necessary to stick to a serial port as opposed to the parallel port when means you can only have one dial per port without the need for a avr.  It has to do with the timing really. 

With a serial connection I can set the baud rate and I have a rock solid timer regardless of the pc you are running it on.  I can modify the pulse rate by just sending different patterns of data

Example:

sending 0x0x0x0x0x1x1x1x1x1 would be a rather slow pulse... it's off for a while then on for a while
sending 0x1x0x1  would be a rapid pulse, it's constantly toggling between 0 and 1

With a parallel interface I don't really have that functionality.  I can do a timer on the software end, but I don't know if a pc is up to the task of pulsing things with that level of accuracy. 

There are gpio boards floating around the net (think usb parallel port) which might do the trick, but they start at 10 bucks and don't have a lot of pins, so an avr might be better. 

We could pick a very cheap avr and I could write some code for it.  I know you can get a teensy for under 20 and I've had pretty good luck with those.  16 I/o pins as well. 

The other option of course is one of the existing hobby avrs.  The ledwiz has power level settings for the leds which would work for a vu meter. There are only 48 degrees of change though, so it wouldn't be terribly accurate.   

I should also mention that if you are just wanting to do a secondary pc monitor mamehooker can handle that right now.  I've got a display file for turbo and it tracks the speed really well.  So long as you are willing to make enough image files you can lay that out however you want. 

Any more ideas on the subject?

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Re: Real Instrument Panels
« Reply #15 on: March 15, 2013, 06:02:56 pm »
I was looking at cheap 5v analog meters on fleabay earlier.
The needle on them looked like it would be very difficult to swap out.
The post it was attached to was recessed and the needle had a few 90 degree bends to bring it out to the face of the meter.
Looks like these might be made the same way.  Still useable, but maybe more of a hassle than anticipated.

Not sure if they have enough range of motion to pass for a speedo or tach.

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Re: Real Instrument Panels
« Reply #16 on: March 15, 2013, 06:19:10 pm »
Yeah my thoughts as well. 

I would think that with that wave of useless usb gadgets we had a few years back somebody would have made a usb tachometer than we could just hack.  Hmm.... maybe I need to check dream cheeky... I know I figured out the protocol for their missile launchers in an afternoon. 

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Re: Real Instrument Panels
« Reply #17 on: March 15, 2013, 06:29:16 pm »
« Last Edit: March 15, 2013, 06:38:28 pm by BadMouth »

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Re: Real Instrument Panels
« Reply #18 on: March 15, 2013, 07:02:35 pm »
I don't think I've ever seen a two wire stepper before.  Not sure how that would work. 


In terms of steps if you want it really accurate you'd need one step per mph/rpm.


I actually found some of the stepper motors for gauges online but they were around 30 bucks a pop... the needles were around 10.  Then then you'd need some sort of face plate ect...

On the other hand, buy a cheap instrument cluster for 30 bucks and you've got the needles and steppers for a whole cluster. 

So we are back to that again.  ;)

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Re: Real Instrument Panels
« Reply #19 on: March 16, 2013, 05:08:21 am »
Bah!  I hate it when I can't sleep, especially when I'm not feeling well. 

Anyway since the gauges in a modern car use stepper motors apparently, I thought I'd take a look into the most common one we would all have readily available. 

http://www.codeproject.com/Articles/16715/Controlling-Floppy-Drive-Stepper-Motor-via-Paralle 

Now all of this is pretty straight forward until you look at the delay he has to use in his code:

Code: [Select]
System.Threading.Thread.Sleep(50); // Delay
PortAccess.Output(888, 0);
System.Threading.Thread.Sleep(50); // Delay

50 Milliseconds per half step, which means 100 ms per step.  That doesn't sound like a lot but 1000 ms = 1 true second and each mph/kph would be one step for our purposes. 
So if you slam on the brakes and go from 150 to a full stop that's 150x100=15000 ms, which is 15 seconds!

I know that different steppers operate quicker but damn, if this is the acceptable delay I'm not sure what is best. 

I looked into CAN bus btw.  It's a pseudo dead end.  Unless you want to simulate the car's entire can computer (I'm not doing that) you really need the interface box to go along with the instrument cluster.  That puts the cost waaaaay back up to the point of where another solution would make more sense. 

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Re: Real Instrument Panels
« Reply #20 on: March 22, 2013, 10:28:31 am »
I know this would add to the cost of the build, but does anyone know what kind of interface that the guy with the ford gauges is using? in his video, the gauges were definitely smooth.  What about using something like a pacdrive with an older set of gauges? A twelve volt power supply from the computer and then pulse the grounds with the power supply? Is this possible? I'm just scratching the surface of all this stuff so I'm really shooting in the dark, please let any of the higher ups with more knowledge correct  me if I am completely off track.

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Re: Real Instrument Panels
« Reply #21 on: March 22, 2013, 10:41:22 am »
I know this would add to the cost of the build, but does anyone know what kind of interface that the guy with the ford gauges is using? in his video, the gauges were definitely smooth.  What about using something like a pacdrive with an older set of gauges? A twelve volt power supply from the computer and then pulse the grounds with the power supply? Is this possible? I'm just scratching the surface of all this stuff so I'm really shooting in the dark, please let any of the higher ups with more knowledge correct  me if I am completely off track.

the title of the video is "Gear Indicator Using Arduino/TFT Module"

I need to get into the Arduino (or generic version of it) someday.
Seems there's a way to do whatever you want as far as using it as an interface.

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Re: Real Instrument Panels
« Reply #22 on: March 22, 2013, 12:33:42 pm »

I need to get into the Arduino (or generic version of it) someday.
Seems there's a way to do whatever you want as far as using it as an interface.
Yeah, I seen some guys program them to calculate gas mileage on there cars before.  Something about splicing into the fuel injectors.

I don't think it's all that hard but I've never really messed with it.

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Re: Real Instrument Panels
« Reply #23 on: March 22, 2013, 01:15:54 pm »
AVR's are actually quite easy to work with, it's just the more pins you need the greater the expense.  You can get a basic teensy (arduino ripoff) for as little as 20 bucks.  It only has about 20 useable pins though.  If the gauges use pulses to control them that's more than enough, but if it's something more complex you are probably going to run out of pins real quick. 

One of those 7 segment displays for example, well that's 8 pins right there. 

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Re: Real Instrument Panels
« Reply #24 on: April 24, 2013, 05:24:14 pm »
I thought I would resurrect this based upon something I ran across. 

If you want to go RamJet's route and use a secondary display this is how I'd go about it:

http://emerythacks.blogspot.com/2013/04/connecting-ipad-retina-lcd-to-pc.html

Retina displays have a very high viewing angle and although finding a display-port capable video card would be a pain in the butt, it'd probably be worth it. 

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Re: Real Instrument Panels
« Reply #25 on: April 19, 2014, 12:32:22 am »
Ok let's bump this Necro thread and get some new ideas rolling. 

TwistedSymphony mentioned that he has played around with this stuff a little more than me, so maybe he can chime in. 

After a year of looking the options I've ran into are basically the ones we all suggested to each other at the start:

1.  Hook up real instrument panels via a AVR
2.  Use a secondary display and fake it.
3.  Spend a lot on sim-centric hardware that is essentially a turn-key avr solution.

Most of us are either converting a sega cab or using a sega cab as the basis for our design.  That makes our options in terms of the dimensions rather limited.  Motorcycle gauges are around the same size, or you can of course roll your own by pulling the stepped motor and needle out of a large speedometer. 

I also ran across this article a few days ago:

http://hackaday.com/2014/04/14/a-7-touchscreen-tv-remote-control-from-scratch/#more-119852

What does this have to do with gages?  Well if you are going the secondary display route, the vendor mentioned in the article sells all kinds of displays for well under 20 bucks.  They would need an avr to control them (I'm a bit lost as to exactly how these work), but you could get a few smaller screens that fit just behind a dial cut-out on your dash. 

I'm still up for suggestions.  Honestly I wish we could just find a good supplier of real speedometer stepper motors for a reasonable price (under 5 bucks a pop).  If that were the case then I could write avr code/software just for those particular steppers and we could all use the same ones. 

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Re: Real Instrument Panels
« Reply #26 on: April 19, 2014, 02:39:51 am »
How about squeezing a 7 inch tablet inside the dash, lay the gauge bezel over the top and fake it. I am sure somebody can drum up an android app that connects via wifi or usb and fakes the needles and allows the gauges to be placed per x,y coordinates.

Simple dual core tabs are $50 new.

Or if we are limited to PC based app then how about a 7 inch asus, acer, msi netbook. Easy to hide, no fancy interface etc.

Or a small LCD with external power but has a video board with vga etc, no like a laptop panel that does not.

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Re: Real Instrument Panels
« Reply #27 on: April 19, 2014, 03:19:01 am »
they make usb monitors that arent too expensive. 16" for 90$ isnt bad. You could get a 2 decent sized dials in there and imagine it would be easier than making it work on android or ios. 

http://www.ebay.com/itm/AOC-15-6-Widescreen-Flat-Panel-USB-Powered-Portable-LED-Monitor-Piano-Black-/191117636450?pt=Computer_Monitors&hash=item2c7f7fb362

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Re: Real Instrument Panels
« Reply #28 on: April 19, 2014, 04:04:11 am »
It's not bad, but I'm not sure it would fit. 

I mean here's a Daytona cp for example:



Like most control panels the shaft of the wheel is in the center and the fake gages are positioned around it. Of course behind the cp is all the mechanics for the wheel. 

So unless you can figure out how to cut a hole in a monitor I'm not sure it would work.  A person would probably need a series of small displays, thus the article I linked to (they sell them as small as 3.5 inches). 

I don't have my cp yet... still designing that part.....  But I'm sitting here holding things up and unless the monitor is really tiny I can't see integrating one without the cp looking funny.

I tried the tablet route, but the only way I could hook it up to gain any amount of flexibility in terms of what I could display was via those virtual desktop apps.  Those lagged like hell unfortunately.  But if anyone can suggest an app that would fit the bill that would work on low end tablets (or else it would defeat the purpose) I'll try it out. 


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Re: Real Instrument Panels
« Reply #29 on: April 19, 2014, 10:32:35 am »


Like most control panels the shaft of the wheel is in the center and the fake gages are positioned around it. Of course behind the cp is all the mechanics for the wheel. 
I tried the tablet route, but the only way I could hook it up to gain any amount of flexibility in terms of what I could display was via those virtual desktop apps.  Those lagged like hell unfortunately.  But if anyone can suggest an app that would fit the bill that would work on low end tablets (or else it would defeat the purpose) I'll try it out. 



I thought I saw that Google had a remote desktop?

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Re: Real Instrument Panels
« Reply #30 on: April 20, 2014, 08:45:54 pm »
After reading the older posts in this thread i had some thoughs.

1. Can bus stuff is still very new and as a result still very expensive. the benefit here is you can just do everything in software.. you can also do cool stuff like gauge sweep patterns etc.... however using older 90s era clusters will require more hardware work (like an avr) but be way cheaper.

 2. I would recommend looking for clusters from foreign cars with a strong tuner community. I'm big into the Nissan s-chassis andiknow a lot of those guys upgrade to japanese clusters meaning that the us market clusters are cheap and easy to find...i've litterally got a pile of clusters for these cars laying around... half of them were just givem to me for free because theyre worth so little peopleoften throw them out.

3. most of these machines have a very small space available for gauges so Perhapse the best thing to do is to figure out the dimensions and find a cluster that will actually fit... this might acrtually end up being more difficult than getting the electronics interfaced.

on that note i know a lot of the 90s era japanese clusters ive worked with are actually modular... meaning you can remove the individual gauges out of the cluster and they're self contained and will run without the main circuitboard... so this does offer some flexibility.

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Re: Real Instrument Panels
« Reply #31 on: April 20, 2014, 11:09:31 pm »
Ok well let me ask you this.  In the video you linked to I noticed that only two wires were hooked up.  Were you using the existing electronics of the board to achieve that or were you somehow pulsing a 4 wires stepper with only two wires?

Check it out:

http://www.ebay.com/sch/i.html?_odkw=toyota+stepper+motor&_sop=15&_osacat=0&_from=R40&_trksid=p2045573.m570.l1313&_nkw=gm+stepper+motor&_sacat=0

Ebay regularly has steppers for cars for around 5 bucks a pop, which I think is reasonable.  You can also generally get a kit of 6 steppers and led bulbs for around 20 bucks, which in all honesty is probably enough to do two cabs for our purposes.  I linked to the GM steppers because unlike most manufacturers, the pins are on the back and they have two mounting holes, meaning, in theory at least you could just drill a small hole for the needle pin, screw the stepper to the back of the plastic, and you are good to go, even in limited space situations like a sega control panel. 

I just don't know about controlling.  I mean simple I/O stuff is easy enough on a avr, I could code a teensy to act like a pac-drive or similar device, but I know steppers are timing dependant.  I also saw stepper controllers in ebay, but I think those are more for upping the voltage for a cnc machine. 

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Re: Real Instrument Panels
« Reply #32 on: April 21, 2014, 11:26:35 pm »
In that video i had 3 wires hooked up.. 12v, ground, and my fake vss pulse.... they were attached driectly to the gauge.. on those clusters the gauges mount into the cluster via 4 screws... those 4 screws is also how the gauge attaches ekectronically... its really pretty clever... the 4th post is a clean output pulse for the ecm.

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Re: Real Instrument Panels
« Reply #33 on: April 22, 2014, 01:59:59 am »
I believe you, but that contradicts everything I've learned about stepper motors. 

It was my understanding that it was a 4 wire process, alternating the voltages on all 4 wires for precise stepping.  Last year somebody actually made a breakout board for switec steppers, which are used in most cars.  The guy even made a library for them, but the reason I ignored it was that 4 pins per gauge is pretty damn expensive. 
https://www.tindie.com/products/TheRengineer/analog-gauge-stepper-breakout-board/

If you were just doing dials it's not so bad, but if you want an over-rev light, shift position indicator, view and start lamps, ect then you aren't going to have enough pins. 

On the other hand, if these can indeed be controlled out of the cluster with one wire (ground and voltage don't count) then it's much more doable.  Shoot I bet we could get a decent, rough indicator with a ledwiz.... the brightness settings are just a timed pulse afterall.  I think there are only 48 steps though... I'd probably still have to put a avr in there
for the final product.

Something that struck me as odd though was the fact that the needles are really expensive!  Your stepper, as I mentioned, is around 5-6 bucks, with free shipping.  The needle, even a cheap plastic one, STARTS at 6 bucks and the nicer ones cost even more.  So it might still be cheaper to buy a instrument panel and part it out. 

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Re: Real Instrument Panels
« Reply #34 on: April 22, 2014, 10:18:06 am »
Im not controlling the stepper motor direcly.... the gauge has an intergrated pcb that handles the vss conversion to something the stppermotor understands. Thats what i meant by it being a modular unit... the gauge itself contains all of its own electronics without needing anything from the larger cluster to operate.

To give you an example here is the back of a tach from a toyota pickup... you an see the 3 metal screw tabs on the edges... this is how it attaches to the cluster both electronically and physically.



I wouldnt try connecting to a motor directly even if you got the electronics tuned properly youd still need a retun spring and ive never been able to get one installed properly (not for lack of trying).
« Last Edit: April 22, 2014, 10:34:12 am by twistedsymphony »

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Re: Real Instrument Panels
« Reply #35 on: April 27, 2014, 05:07:57 pm »
Sorry I didn't reply, I've been busy. 

Do you have a parts link or an ebay link to one of those?  I've started construction on my cab and I might pick some up to play with. 

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Re: Real Instrument Panels
« Reply #36 on: May 03, 2014, 11:13:41 pm »
Heh, I guess ts hasn't seen this. 

Anyway I'm slightly ill so I was stuck inside today.  I decided to give the android tablet route another try.  iDisplay seems to be the one that most people use.  I tried it on a crappy tablet and a much nicer galaxy.  The amount of lag in the program seems to greatly depend upon the processing power of the tablet. 

The galaxy performed just fine. While there was a tiny bit of lag it wasn't anything worth mentioning.  There were some quirks though, most notably that the newer tablets don't have a hardware menu button and the idisplay only lets you change settings upon startup, so you actually have to turn off the desktop app to change settings as it autoconnects by default. 

The cheaper tablet technically worked, but there was a decent amount of lag... like a second or more.  It would be fine if you just wanted to display stuff for eye candy, but if you actually wanted to read those gauges, then it wouldn't work. 

Since the "monitor" is done in software, it does take a bit of resources on your pc as well.  For outrun 2006 it was fine, but my guess is you might notice a performance hit on a high-end pc game or a very demanding emulator.  Also a severe limitation of the app is the fact that you can only hook up one tablet at a time, so forget about using a couple of small tabs for each gage. 
 
So in conclusion, if you happen to have a mid to high end tablet lying around that you aren't using, you could go this route.  Also if you have a low-end tablet and just want some motion on your dash it would be ok as well, but all-in-all considering the lack of functionality on the low end and the expense on the high end, a actual second pc monitor would probably be cheaper and perform better. 

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Re: Real Instrument Panels
« Reply #37 on: May 05, 2014, 09:49:40 am »
Sorry I didn't reply, I've been busy. 

Do you have a parts link or an ebay link to one of those?  I've started construction on my cab and I might pick some up to play with. 

sorry I guess I missed this post.. if you're looking for some gauges to play around with then you might have a hard time finding JUST the gauges.... you'd have an easier time buying a whole cluster....

I'd say just buy whatever looks like it would fit in your cab and your budget and as long as it's not mechanical just run with it. (mechanical speedos were common up through the 80s. These are driven by a spinning cable instead of electrically, you can tell these because they have a 1/2" diameter nub for the cable hookup sticking out directly behind the needle)....

----------------

I have a S14 Silvia gauge cluster with a broken speedo (it was fully working until I accidentally borked the needle return spring attempting to remove the needle. The tach and the rest of the cluster is fully working working... if you want it I'd gladly send to to you for shipping costs.

I have a few other fully working clusters but I think most of them are mechanical... I'll have to check.

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Re: Real Instrument Panels
« Reply #38 on: May 05, 2014, 10:24:44 am »


True Story

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Re: Real Instrument Panels
« Reply #39 on: May 05, 2014, 07:11:53 pm »
I'll look into it some more, thanks guys.  Eh don't be sending me stuff just yet.  The rate things are going real-world wise, I don't know if I'll get the time to finish now. 

BM, you totally did it wrong.  You are supposed to "throw them away" at your home, on eBay or at the local swap meet.  ;)