MPGuino release one workspace

[Wonderboy]

@ Brandon

I can't believe I didn't think of just using a continuity tester... durr.

Thank you for this, and hopefully others will find it useful as well.

[cmags]

Originally Posted by wagonman76

Hi, I am really thinking about starting on this project for my OBDI vehicles. Do I need to snap up one of the v1.0 serial boards before they are gone, or will everything work just the same with a v2.0 serial board? Im running NT4 sp6 so I do not have USB.

I don't see why the v2.0 board wouldn't work. The only difference is the serial programming interface - the functionality should be identical:

Originally Posted by NKC Electronics

This KIT uses a MAX232 compatible RS232 driver, instead of the 2 transistors used in the original Arduino serial board, improving the reliability of the RS232 communication to higher levels comparable to the USB board.

[cmags]

So I've got everything built, and since v0.66 and having it hardwired, everything seems to be looking good on the bench. It seems that all thats left is to get at my ECU and test this bad boy out in the car.

Something really strange I noticed however:

As of v0.67, it seems that I am now my own signal generator. If I touch the VSS input, I will get on the instant raw data screen up to 60.00-61.00 (not sure what that means but it equates to about 52mph on the first screen). And if I touch the injector input, I get a uS of ~362000. I'm not sure if this is just because I don't have them hooked to a solid signal and they're taking the minute electrical signals in my finger and running with them, or if this is going to be a noise problem. Any ideas on this? It is cool to see it working though

[wagonman76]

I suppose thats possible, picking up interference, depending on how sensitive the mpguino is. What I would try is shielded wire, or at least wrapping the wires with foil and see if it helps.

[dcb]

Naw, it does that when not hooked up. It's not a problem when it is hooked up, so it's not a problem.

[cmags]

^^ Cool that's exactly what I wanted to hear Now I don't have to build a signal generator, and can see that it is working. Now to find those schematics again that I found for my car....

[starquestPilot]

the list of beta testers/second fiddlers now includes:
larrydag - '95 Honda Accord DX
myself - '98 Pontiac Firefly (Geo Metro)
andrewj - '94 Civic CX
mosier - ??
awillard69 - ??
Mr Clean - ??
And of course our fearless leader:
dcb - 97 saturn s2
Did I miss anyone?

I'm using a '85.5 Mitsubishi Starion...

[awillard69]

I'll be putting mine in the Jeep, '01 Wrangler. Been busy lately (family, work, more family), but hope to get it installed this weekend. I'm putting it into an enclosure, just working on the buttons now, then it's just wiring. I'll post pictures when I get it done. Plus, since it's OBDII, I'll also be shadowing it with the SGII.

[Wonderboy]

Don't forget my '93 Corolla.. I've been busy too, but I'm almost there

[cmags]

And my '05 Subaru Impreza Outback Sport. Here's the info for the database:

Injectors: 4x 155cc/min = 366330173 uS/gal/injector... /2 = ~183165000 - for some reason dividing by two is giving me more accurate mpg readings. Gotta calibrate still over a few tanks, but this is far less optimistic, but more realistic I think.

VSS: Seems that 8000 even matches my ODO exactly... I may calibrate this to the GPS though for more accuracy since I know my ODO is off a hair.

Injector/VSS/ECU pins/locations for '05 Subaru Impreza:

http://i18.photobucket.com/albums/b1...iagram-VSS.jpg
http://i18.photobucket.com/albums/b1...-Injectors.jpg
http://i18.photobucket.com/albums/b1...nectorPins.jpg
http://i18.photobucket.com/albums/b1...rLocations.jpg

[SVOboy]

So if the MPGuino is only showing about 1/5th of the distance, I should convert my 8204 number to 1640?

[dcb]

No, well yes, but no!! Something is wrong if it is 1/5.

Can you put a voltmeter on the mpguino to car vss connection and turn on the ignition then roll the car slightly till it reads 12 volts? Then measure the voltage on analog 0?

[SVOboy]

Yoink! I'll solder everything up tidy and do that. Post back in a bit.

[dcb]

Ok, I wasn't asking to resolder everything, just to measure the voltages with it in the car. Of course you may have reasons to believe that resoldering is necessary that I am unaware of. Make sure your Zeners in in the right way too.

[SVOboy]

Well, I was soldering them cuz I just had them twisted together by hand and exposed, and now that I know I have the connections proper, I thought I should solder them and be done with it.

Anyway, I got voltage 10.8 at the vss and 3.7 on the analog pin

[dcb]

Ok, 3.7 is pretty solid. Can you do continuity from a duino ground pin to vehicle ground?

[SVOboy]

Ground is fine, but the vss setting on the mpguino was way off. I know I reset it to 8204 for perhaps that setting was lost. I reset it again, keyed off, and it stayed at 8204...I'm going out soon so I guess we'll see.

[dcb]

You are getting mpguino power from the battery and not the ignition, right? The atmega does not like bouncy power in the least. You might need to reflash it if it isn't happy yet.

[SVOboy]

I'm getting the power from one of the power draw spot on my underdash fuse box. We shall see if it works of if I need to move the source.

[SVOboy]

Hey all, the 8204 number is pretty much spot on...

Now I wonder about the fuel value. I used andrew's since the vx and cx have the same injectors (or so they say), but I was wondering if anyone has calibrated on a VX?

Thankee