MPGuino release one workspace - Page 39 - Fuel Economy, Hypermiling, EcoModding News and Forum

orange4boy · 11-23-2008, 04:42 AM

I have checked them several times and they are all correct as the instruction photos and board graphics show.

I have it hooked up in my shop now to a battery. I'm showing 5ish volts all over the place but no joy on the screen. How would I test if I got a bum diode? Or could it be a bad solder?

dcb · 11-23-2008, 06:41 AM

Can you clarify, if you plug it back into the usb it works fine?

wyatt · 11-23-2008, 11:30 AM

The way I found out that I had a bad solder was by hooking it up and wiggling components around. I had a bad solder on one component, and now everything works. This only fixed an intermittent problem, so may not apply.

orange4boy · 11-23-2008, 04:28 PM

It works fine with the usb plugged in although I took it in the van with me and it's not getting any data. I'm not powering them (usb and 12v) at the same time, just the data wires.

Why do I get continuity from the injector data RJ11 wire to D1? That's crazy talk! . D1 should be getting the 12v+ If you reverse the rj11 in the diagram it all make sense. And I'm getting continuity to the ground from the RJ11 to what should be the diode and resistor for the injector

I think either the board was etched wrong or the RJ11 wires are assigned wrong in the instructions. (or I'm going nuts ) If you look at the male RJ11 symbol on the diagram, the 12v+ is on #3 not #2. On the guino it ends up correct to the drawing but the board sends the wires to the wrong components. 12V+ goes to the injector circuit, 12V- goes to the VSS, VSS goes to the 12V ground etc.

Do I risk reversing them myself?

orange4boy · 11-23-2008, 04:43 PM

WOOT!

I was right. I reversed the RJ11 wires. Red to 12v+ and black to 12v-, plugged her in and she works!

Should someone inform Fundamental logic? My only question is whether there is such a thing as a crossover RJ11 cord which would be the only other explanation.

scubascooby · 11-26-2008, 12:30 PM

Hi Guys,

I was googling for some info on mpg metering in non-OBD cars and found this thread. I posted a link from ImprezaSport.net

I know nothing about the *duino modules so I need to do some background reading. They seem to be some sort of programmable i/o controller. If I can work out what is needed I may have a go. The basic idea looks simple but a few people have added comments about protecting the circuit and vehicle wiring.

Also, aesthetics is important in my car so it would have to look the part. I wonder if it would fit in a standard gauge pod that could be fitted to the Impreza a-pillar ?

This project is genious, well done to those involved.

ps can it handle Imp Gal. and Imp Miles instead of the US versions ?

wyatt · 11-26-2008, 01:20 PM

Quote:

Originally Posted by scubascooby

...can it handle Imp Gal. and Imp Miles instead of the US versions ?

Sure can, you just adjust for that in your scale factor numbers. dcb (the genius you referred to) has made this very open source, so if you preferred L/km you could go in and figure out a way to do that, too.

wyatt · 11-26-2008, 01:22 PM

Quote:

Originally Posted by orange4boy

My only question is whether there is such a thing as a crossover RJ11 cord which would be the only other explanation.

I don't know anything about that, but you can unplug your cord and look at the two ends... you should be able to see the colors through the clear end and see if the colors match up. It could very easily be that there is a cross over cord, I really don't know, but it's easy enough to check.

orange4boy · 11-26-2008, 04:03 PM

This cord is all white and there are no colours visible but from the instructions for the wiring on spiffie the male end looks like this. facing the contacts, cord towards you,
this is the female to board config:12V-, 12V+, injector, VSS
this is the cord: VSS, Injector,12V+,12V-

I'ts easy to fix by swapping wires but the instructions should be right.

I'll test the cord later to see if it's crossing over. I did come with my mac for using the fax function although I've never heard of one.

scubascooby · 11-26-2008, 05:42 PM

Quote:

Originally Posted by wyatt

Sure can, you just adjust for that in your scale factor numbers. dcb (the genius you referred to) has made this very open source, so if you preferred L/km you could go in and figure out a way to do that, too.

So this has to be done in the code uploaded to the mpguino, it's not configurable from the finished device via the 3 buttons ?

I'm not a big fan of C, probably my least favourite language.

wyatt · 11-26-2008, 06:49 PM

Nope, all the alterations are able to be made from the MPGuino its self. In the setup screens you can change the usec/gal (microseconds per gallon) and vss (vehicle speed sensor) readings. If you want to adjust them to imperial gallons and imperial miles the MPGuino doesn't care... to it they are just numbers. There is also a kit, but last I knew they were on backorder. You can get a lot more information in an organized fashion at the wiki.

Nevyn · 11-30-2008, 09:02 AM

Hi all, just signed up over here because I had some questions, and would like to help with any info if I can too.

The main Wiki page says "see this thread for updates," but the first post in the thread says "no longer updated, see wiki for current info." That may be a little off-putting to new folks.

My Arduino board is on its way, thanks so much for making this project!

rmccomiskie · 12-01-2008, 10:31 AM

Sure enough! The wiki refers to the Release 1 post as the latest info and the Release 1 post refers to the Wiki for the latest. Confusing!

Someone should fix this.

Nevyn · 12-04-2008, 02:55 PM

Quote:

Originally Posted by orange4boy

This cord is all white and there are no colours visible but from the instructions for the wiring on spiffie the male end looks like this. facing the contacts, cord towards you,
this is the female to board config:12V-, 12V+, injector, VSS
this is the cord: VSS, Injector,12V+,12V-

I'ts easy to fix by swapping wires but the instructions should be right.

I'll test the cord later to see if it's crossing over. I did come with my mac for using the fax function although I've never heard of one.

It IS a cross-cable. When it was made, one plug on one end was clip-up, and the other is clip-down.

Moreso seen on phone than on PC network cables. If you were to loot at the ends of your wire, with no twists in the wire, your ends might line up like this:

__---__ (text spacer) _______
|........| (text spacer) |........|
|........| (text spacer) |........|
-------- (text spacer) ---__---

Whereas other cables are:

__---__ (text spacer) __---__
|........| (text spacer) |........|
|........| (text spacer) |........|
-------- (text spacer) --------

Trust me, I've done this enough times making patch cables. If you accidentally flip the wire or the end to be crimped on over in your hands, Pin 1 becomes Pin 4....

orange4boy · 12-05-2008, 07:08 PM

Cross over. That's what I thought. I guess there should be a warning in the instructions that this may be possible

Tercelerat0r · 12-07-2008, 08:11 AM

Ugh...I despise and revel in not having a job all at the same time, anyways:

I'm a weiro/geek/person/thingy and use a Mac...how much of a pain would it be to use my Mac for setting a MPGuino up? Yes I do have access to a windows machine, but its a big heavy desktop running 2000 on a Pentium 2 and is slower than dirt, pretty much useless.

Oh the wonders of not following the crowd

dcb · 12-07-2008, 08:29 AM

I would visit http://arduino.cc for platform specifics, though I'm sure someone here has it working on a mac too.

McTimson · 12-07-2008, 12:11 PM

It should be just as easy as setting it up on a PC. The Arduino program is available for OSX, and the screenshot on the download page looks exactly like the Windows program, so it shouldn't be any different. Just make sure you get Arduino 11 (scroll down on the download page), not the newest version.

Nevyn · 12-07-2008, 03:52 PM

The Arduino IDE is Java based, so it's available on all platforms, and is basically identical. What flavor of OSX are you using? I have 10.3.9 and 10.5.2 at my disposal, as well as a USB Arduino...

gascort · 12-08-2008, 12:11 AM

Quote:

Originally Posted by orange4boy

WOOT!

I was right. I reversed the RJ11 wires. Red to 12v+ and black to 12v-, plugged her in and she works!

Should someone inform Fundamental logic? My only question is whether there is such a thing as a crossover RJ11 cord which would be the only other explanation.

Hmm.. my lcd is doing this too; I assembled correctly and my cord seems to be non-crossover though.
Time to try swapping the wires in the RJ box... wish me luck!