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McTimson 10-25-2008 11:16 AM

My MPGuino build - I need help!
I ordered all the parts to make an iDuino MPGuino, all of the stuff came yesterday, but I'm still waiting on the iDuino to get here. So to get through the wait, I thought about where to put this thing in my car. Luckily, the clock for my car is pretty much the perfect size for this LCD.

Here's the normal clock:

And here's with the LCD instead of the clock:

The back:

And the wires from the original clock:

The LCD actually wedges in there, it would probably stay there on it's own, but I'll probably screw it in or something.

The clock is easily removable, it's only clipped in, so you just pull and it comes right out.

The wires leading in are battery, accessory, ground, and something from a taillight relay. I'll use the battery and ground line, and use the other 2 wires for VSS and the injector signal.

There's also a pretty decent amount of space behind the clock in the car, I think I'll definitely be able to fit all the components in there.

The original clock even has 3 buttons, unfortunately they're the type that connect 2 spots on the PCB, but I can still use the holes in the plastic to make it look like it's somewhat stock.

Now I just need the iDuino!

gasnmyveins 10-25-2008 08:26 PM

Good thinking, that's going to look great. If you get some black plastic, you could cut it to size for the opening between the guino and the clock housing, and it would look like the factory put it there themselves. You could even mount the lcd to the plastic and then mount the plastic to the clock housing. Might be a good bit easier. Good luck.

wagonman76 10-27-2008 12:28 PM

Wow thats cool. +1 on the black plastic. Looks like it could be made to look good on just about any car just sitting on top of the dash, just get the right color housing from a junkyard Tercel.

McTimson 10-27-2008 02:20 PM

Yea, I'm going to try to just cut out a hole in the original plastic for the LCD screen. You can see the original black plastic in the last picture, it's upside down there.

If I leave the screen behind the plastic, it'll probably be too dark, but I'll do some testing to see if it'll be visible enough. I am going to use the original buttons, I'll just have them push my new switches, to make it look cleaner.

I hate having this stuff just sitting on my desk, I need my iDuino to get here!

McTimson 10-28-2008 01:18 PM

I cut up the plastic today, and got it to fit in nicely:
LCD off:

LCD backlight on:

I think it looks awesome, hopefully I can get everything to fit in the space in the car.

I really want to see what it looks like with symbols on the screen, because right now I can only get the backlight to turn on, I don't feel like making a circuit to control all the other inputs.

i_am_socket 10-29-2008 07:52 AM

Very awesome :thumbup:

I'm still trying to figure out where to stick mine once I get it assembled.

McTimson 11-18-2008 07:34 PM

The iDuino came yesterday, and I wasted no time getting it put together. Spent most of the day yesterday soldering everything, and today making it fit. I still need to get it in the car, I'm pretty sure I have the wires I need, but it's too cold right now to try messing around with it outside. Anyway, here's the finished product (hopefully):

TomO 11-18-2008 10:14 PM

Congrats and very slick looking installation!

MetroMPG 11-18-2008 10:21 PM

Awesome. Soon you'll be selling Guino mounts on eBay along with all the SG blend mounts. :)

wagonman76 11-19-2008 12:25 PM

Cool, looks great!

McTimson 11-22-2008 10:09 AM

Alright, I tried hooking it up in the car, and it's not quite working yet...

First, the voltage regulator was backwards. The screen flickered whenever it tried to turn on, so I fixed that.

Now, it's not showing any data from the car. Occasionally, the gallons/hour number will jump to something, but then it'll go back down to 0. So, I'm no sure if I tapped into the right line for the VSS signal. Here's a picture from the EWD for my Tercel, I boxed the VSS line that I used, and the injector signals. Do these look correct?

The manual also says that the VSS signal is pin 13 on that connector, so I think that's correct.

Is there anyway to see if they're the right lines using a voltmeter?

Oh, also, on my injectors, both connections on each injector showed-12V...I used the black-red wire because it looks like that would be the ground.

dcb 11-22-2008 11:23 AM

Nice :)

The injector tap looks like it should be from the other side of the injector (left), any injector.

The speed looks right. Does the upper right field on the first screen "S" look like an indication of speed, goes up when faster, down when slower.

McTimson 11-22-2008 12:42 PM

Never mind, I'm stupid, and hooked up both of the Zener diodes backwards. I just replaced those, and took it for a little test drive, and it works great!


McTimson 11-22-2008 01:16 PM

Oh, and you were right dcb, I had switched the injector wire yesterday when I was trying to figure out what was wrong, and it's on a white wire now, so that works.

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