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Old 07-09-2010, 07:05 AM   #941 (permalink)
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I will also volunteer that avrstudio does not do C++, at least not willingly

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Old 07-09-2010, 09:39 AM   #942 (permalink)
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"deprecated conversion from string constant to 'char*'" and others about string pointer come from c++ that does not understand pretty well the PSTR() macro, it's harmless.

The only ones you should take a look at are:
line 175: 'tankHold' may be used uninitialized in this function
and maybe
line 1374: comparison between signed and unsigned integer expressions

If you have a .hex you should be able to flash your chip, with either avrdude or avrstudio.
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Old 07-10-2010, 03:57 PM   #943 (permalink)
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Went around in circles for a bit today. Tried to use your instructions Magister but because I had installed AVR Studio, it's USB driver wouldn't let WinAVR's USB driver from working with my AVRISPMKII. Found a thread on installing a libusb filter which completely disabled all my USB ports on my PC
Had to dig out a PS/2 keyboard and mouse to recover from this goof.

Finally decided 'heck with it', used AVR Studio to compile the .CPP program. Used the programming interface to read the fuses from an Arduino off a Duemilanove board, then installed a 'blank' 328P, programmed the .hex that AVR Studio generated, then programmed the fuses and it works!!

Time to go and pickoff the needed wires on my 92' Metro and get this thing into operation!



Edit: Took current measurements on the bench. ~ 27mA at brightness = 3, regulator is barely warmer than ambient. No heatsinking needed and the final version I can use a smaller smt version.

Edit-2: Wired it in and it works! Happy happy joy joy! Now it's time for calibration!
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1992 Geo Metro, 1.0L 5spd, 435,000 miles on the original engine and trans!
- knuckles/hubs/brakes/13" wheels from a 2000 Metro
- running 175 70R13
- averaging 51.7 MPG, 56.9MPG best tank.
- self built MPGuino
- http://www.dschmidt.com/MPGuinoJBD.html

Last edited by JellyBeanDriver; 07-10-2010 at 11:03 PM..
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Old 07-11-2010, 08:00 AM   #944 (permalink)
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I bought a display about a year ago, intending to build an mpguino but it doesn't look like I am going to get very far.

Can I buy the rest of the bits anywhere so I can just solder it up and connect it to the car ?
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Old 07-11-2010, 01:10 PM   #945 (permalink)
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Quote:
Originally Posted by scubascooby View Post
I bought a display about a year ago, intending to build an mpguino but it doesn't look like I am going to get very far.

Can I buy the rest of the bits anywhere so I can just solder it up and connect it to the car ?
Yes, that's what I did (well, I had all the other parts, just had to buy a microcontroller).

Schematic is here. http://opengauge.googlecode.com/svn/...no/mpguino.png

The $55 donation unit is a good deal but I don't know what shipping is to the UK.
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1992 Geo Metro, 1.0L 5spd, 435,000 miles on the original engine and trans!
- knuckles/hubs/brakes/13" wheels from a 2000 Metro
- running 175 70R13
- averaging 51.7 MPG, 56.9MPG best tank.
- self built MPGuino
- http://www.dschmidt.com/MPGuinoJBD.html

Last edited by JellyBeanDriver; 07-11-2010 at 01:16 PM..
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Old 07-11-2010, 08:43 PM   #946 (permalink)
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+$8 will get one to the uk or any non-us site pretty much.

Nice job getting it working!
.
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Old 07-11-2010, 08:47 PM   #947 (permalink)
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Thanks to you for doing this!

Drove for a bit today. Really like the instant screen with MPG, MPH and tank average (I think that's what it is). I have larger tires (knuckle/brake/ 13" wheel upgrade) so my speedo is off but I tweaked the MPGuino to read correct.

Now I can see my MPG drop idling at stoplights - that'll give me incentive to kill the engine at lights.

Looking forward to my drive into work tomorrow (100 mile/day commute). I've always thought that my car got better FE driving 65-70 vs 55-60 as it feels like the engine is lugging 5th at the lower speed. Now I'll be able to tell!
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1992 Geo Metro, 1.0L 5spd, 435,000 miles on the original engine and trans!
- knuckles/hubs/brakes/13" wheels from a 2000 Metro
- running 175 70R13
- averaging 51.7 MPG, 56.9MPG best tank.
- self built MPGuino
- http://www.dschmidt.com/MPGuinoJBD.html
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Old 07-13-2010, 12:10 PM   #948 (permalink)
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I have this N27AZ display

Supertwist Alphanumeric LCD Modules : Liquid Crystal Displays : Maplin

which controller is recommended ?

Who is selling kits at the moment ? Can I get one without the display ?

ps. Are there any display pods that will take the lcd display ?
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Last edited by scubascooby; 07-13-2010 at 12:29 PM..
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Old 07-14-2010, 01:53 AM   #949 (permalink)
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Amy occasionally gets a request for a prebuilt without the display soldered on. We can't properly test it that way, but will do it. The lcd connectors are also a common spot to get a solder bridge, which isn't hard to rectify once identified (heat and flick).
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Old 07-14-2010, 05:27 AM   #950 (permalink)
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Sorry I didn't realise it was pre-built, I thought it was a kit of
parts.
.
It's probably easier just to go with the pre-built. Were can I order ?

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