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Old 08-08-2003, 01:45 PM   #1
Clearink
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Default Interested in 1 DIN OBD-II Display?

Don't know if this is the right place to post this; so excuse me if there is a more appropriate section.

I plan on making an OBD-II module using the ELM OBD-II decoder for ISO vehicles. Pretty much this unit would fit in the single din are under my stereo. There would be a backlit display with two menu buttons to navigate through sensor readings.

This module would display all OBD-II sensor readings on the 2x24 display; like MPH, RPM, Engine Temp, etc... and any trouble codes.

I also plan on adding an accelerometer to the unit. I'm wondering if anyone has any ideas as to presentation of the data or even if anyone might be interesting in a unit like this; or does one already exist.
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Old 08-08-2003, 03:14 PM   #2
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i'd be interested.

maybe a post if FFI would be more helpful

something with a grrn backlight to match the WRX would be good too.
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Old 08-08-2003, 03:16 PM   #3
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Something else does exist. You can get them from quantum racing.

click here

Good idea though.

-Todd
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Old 08-08-2003, 05:06 PM   #4
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That one looks pretty much like what I was going for... L295 is that Euros? Im thinking I could make mine for $200 for the parts using rapid prototyping components. It would also be totally customizable. Adding a couple relays that would engage/disengage based on sensor readings seems like a good idea... kinda like their intercooler sprayer enable...

I think I'll still make one and see if I can do it for less then them.

I'll post pics once I get the DIN pocket, LCD, and microcontroller put together. Once I get the ELM controller then I can start programming it.
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Old 08-09-2003, 05:03 AM   #5
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and make sure its readable in sunlight! i saw one of those s.e.c.s unit on a friends car and couldn't see for swat what the readings are!
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Old 08-09-2003, 02:21 PM   #6
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I'll Definately put brightness and contrast knobs on the front. I'll also have select and enter buttons. If I have any extra output pins on the micro ill connect them to 5v relays capable of switching 50volts. And have those come out to a connecter. It might be difficult getting the ability to tell it to switch the relay based on RPM etc... You'd need a keypad for that and I don't think there is enough space.. I plan on starting to put it together tomorrow - I'll put some pics up
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Old 08-09-2003, 03:05 PM   #7
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Here are two examples of what the sensor readings and Intro screen will look like. The display shown is a little too big for the single DIN opening but I have another smaller 20x4 on the way.
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Old 08-09-2003, 03:40 PM   #8
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If you can get a WIDE variety of stuff to display on that and still keep in the $200 range I bet you'd sell a ton of em! I know I'd buy one... Oh, and make the install easy...

Here's an idea, you could grab one of those pass-through harnesses that the OEM subwoofer uses so that you could power the unit via the radio harness....
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Old 08-09-2003, 04:26 PM   #9
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Once I get a set way to mount this into a DIN pocket with a plexiglass front, all that would be needed is a cable to the OBD-II port on any OBD ISO compatible car and 12v and ground from the radio harness. I'd probably have to put a 12v regulator in there to make sure it gets nice clean power.

Tomorrow Ill pull out my DIN pocket and see if I can rig something up real quick just to see how it looks.
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Old 08-09-2003, 04:28 PM   #10
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Also, it would be able to display any sensor available with OBD-II and trouble codes (not interpreted though - like code 0303 Plug 5 misfire). There is 32kb on the EEPROM for the micro im using, that should be enough for all sensors with little descriptions. Maybe even graphic bars...
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Old 08-12-2003, 02:03 PM   #11
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I am very interested in this. Do you know or is there already a thread which shows the supported parameters a WRX will let you monitor.

Another option I have been looking into is a Palm OBD scan tool.
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Old 08-12-2003, 02:32 PM   #12
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It definately supports the standard OBDII sensor readings as follows:

PID 04 Calculated load value %
PID 05 Coolant temp. deg C
PID 06 Short term fuel % trim Bank 1
PID 07 Long term fuel % trim Bank 1
PID 08 Short term fuel % trim Bank 2
PID 09 Long term fuel % trim Bank 2
PID 0A Fuel pres. kPa
PID 0B Intake man. pres. kPa
PID 0C Engine RPM
PID 0D Vehicle speed km/hr
PID 0E Timing adv. deg
PID 0F Intake air temp deg C
PID 10 Maf air flow gm/sec
PID 11 Absolute Throttle sensor position %
PID 12 Sec. air status
PID 14 Oxy. sensor voltage bank1 sensor1
PID 15 Oxy. sensor voltage bank1 sensor2
PID 16 Oxy. sensor voltage bank1 sensor3
PID 17 Oxy. sensor voltage bank1 sensor4
PID 18 Oxy. sensor voltage bank2 sensor1
PID 19 Oxy. sensor voltage bank2 sensor2
PID 1A Oxy. sensor voltage bank2 sensor3
PID 1B Oxy. sensor voltage bank2 sensor4
PID 1C Design OBD requirements
This PID returns information to determine which OBD requirements the vehicle was designed to meet. The value of Data A is defined as follows:
01 - OBD II (California ARB)
02 - OBD (Federal EPA)
03 - OBD and OBD II
04 - OBD 1
05 - Not intended to meet any OBD requirements.
06 - EOBD (Europe)


Currently I have these working along with the Trouble Codes. I have to put the ELM module and the micro with LCD and buttons into the single DIN enclosure. I'm going to have to do some cutting with the LCD I have now but I ordered 4 smaller ones today.

Later today I will post a link to the Video of it cylcing through the sensor readings. Also you will have the option of setting which ones to cycle through and also view just one at a time and press the select button to cycle or enter to get the menu.

The only problem I have right now is finding a cheap way to get 5 volts from the 12 volts provided in the OBD II cable. The ELM module has its own DC-DC converter, but it only provides enough current for itself. The Micro and LCD draw atleast 250ma on their own.

It works - but it looks like spaghetti now.
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Old 08-12-2003, 02:38 PM   #13
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Also, once it is figured out how to best enclose everything, there would only be one wire coming out (the OBD-II Cable) and this would plug into the OBD-II port of the car. The DIN unit could then pull all its power from the cable. (Only 400mA or so).

One problem, however would be that there is no static protection. It could be an issue a person plugs it in and out alot in dry weather. Personally, I don't think it would be much of an issue. However, the ELM module does cost $89.
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Old 08-12-2003, 02:58 PM   #14
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Would it help to run the power through a seperate relay? Anyway, you sound like you have more electronics-smarts than I do, but I like your plans so far... Too bad you live so far away. I'd like to see it in person. And does it measure voltage too? The one thing I hate about subaru is that there is no voltmeter...
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Old 08-12-2003, 03:08 PM   #15
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Well When I finally get it put together and installed Ill make a video of it and post the link. Thats almost like in person. As to a voltage sensor, I dont think there is one available in the OBD_II readings. I'll check on it and see if Subaru has a special code for that. So far, Im only using the standard codes...
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Old 08-12-2003, 03:12 PM   #16
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well, that would be cheaper than the subaru gauge pack and have more features if it did cover voltage too. Anyway, I'm looking forward to seeing more when you do get it on video...
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Old 08-12-2003, 03:53 PM   #17
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Quote:
Originally posted by G-force
and make sure its readable in sunlight! i saw one of those s.e.c.s unit on a friends car and couldn't see for swat what the readings are!
How about usiing VFD display like Apexi AVC-R?

I think that will solve the issue
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Old 08-13-2003, 12:18 PM   #18
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Another possibility I might try is the following

http://www.decadenet.com/bob3/B3screenshot1.jpg

This module allows you to overlay text on a video screen. So if you have a LCD Video display you can overlay the OBD-II reading on it. It support 680 characters per screen so there could potentially be alot more information displayed at a time.

I don't have an LCD in my car though so odds are this will be on the back burner till next year when I can afford one. The video overlay module is $99.

Right now I have a working "prototype" that communicates with the car - but the numbers are off. Once I get this fixed I'll post the"working" video. Its still a jumble of wires and hasn't been mounted in a DIN enclosure.

I think the Video overlay module might motivate me to buy an LCD for my car.. That would definately be better than a character LCD. The overlay lets you put the text on top of an existing video feed. Pretty neat.

http://www.decadenet.com/
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Old 08-13-2003, 02:45 PM   #19
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Quote:
Originally posted by Clearink The overlay lets you put the text on top of an existing video feed. Pretty neat. [/b]
I'd say "pretty neat" describes your whole project darn nicely!

Stu
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Old 08-13-2003, 05:05 PM   #20
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For now I decided to go with the following as an LCD Display and Button Entry

http://www.hvwtech.com/pages/product...?ProductID=111

Its for a 5-1/4" Drive Enclosure but with a couple mount blocks to fill in the sides it should fit real nice. I'll still use the DIN Pocket to mount this to.
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Old 08-14-2003, 12:15 PM   #21
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Don't know if anyone is interested for another update but here goes. I got all sensor readings working. Im having trouble with the Trouble Codes however. Some of the sensor readings, it turns out, on the Subaru WRX aren't there. Like some of the Oxygen Sensors they get NO DATA. I'm looking into getting more Sensor readings that are Subaru WRX specific.

I will add the ability to monitor the cars voltage, and the 2g Accelerometer. These will both be displayed as Sensor Readings. In addition to the OBD-II cable you will need to provide a switched power lead from something like your stereo. It turns out the 12 volts from the OBD-II cable is always on. So the connections will be OBD_II cable and 12 volt switched. The ground will still be taken from the OBD-II cable.

I guarantee I will have a working demonstration Installed in the car by Friday August 22. It may not have the fancy face yet but it WILL work.

I'm starting to get excited - Ive been spending all my spare time working on this.
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Old 08-14-2003, 03:09 PM   #22
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I'm VERY interested.

I had thought for you thought.

The STI comes with a blank plate, instead of a radio, that matches the silver trim in the WRX. Could you possible get these plates and cut out an opening for the screen so that when mounted it matches the dash color?
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Old 08-14-2003, 03:40 PM   #23
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i am really interested in this...what are you using to do all the work? pic chips?

where did you find a breakdown of the obd-ii protocol?

please keep us updated
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Old 08-14-2003, 09:44 PM   #24
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One more idea...

Could you possibly have a LED light or an audible alarm that could be programmed as a shift light/alarm?
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Old 08-14-2003, 10:02 PM   #25
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Kwyjibo,

If someone is good at cutting a nice finished rectangle Im sure you could easily attach the display to the back. You would also need two holes for the buttons, unless you want it to just be in scan mode.

Korpse,

Im using the altera chip with a basic interpreter to make the programming easier. It has 32kEEPROM so you can put a good amount of functionality in it. Except the trouble code lookups those would need another 128k at least. Oh well maybe later.

The OBD-II protocol breakdown is at http://www.obddiagnostics.com/obdinfo/info.html if you want to look. Its mostly learn by example. Its not TOO bad after you look at it for a bit.

KwyJibo,

Yeah I could put a piezo buzzer or an LED for a shift light. But, the scan rate that it would get the RPM is like 4 times a second. If that is a quick enough update then that would work, Maybe you could account for the lag by setting the RPM a little lower so that by the time you get to the actual RPM (0.25 seconds later) The light will come on.

Also, the Matrix Orbital Setup came in, BUT!!! It didn't come with the display. I just wrote the guys at HVWTech.com in Canada about it. I hope they dont try to screw me. I'll still be able to put it together it just wont look as sharp.
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