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Prototype 40 years old Hybrid Speedo

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narumi I'll do it tomorrow

138 posts · joined Aug 2011 ·

#942305


Edited
(wrote it late at night and didn't really make sense)

the 16 x 2 lcd monochrome is the display you might find in some of the vending machine with mostly, green backlight.
There isn't much room to display the units but well, fuel is in percent, oil is in PSI, temp is in celcius and volt.....

I had my old man cutting the speedo backing plate.

it is still on a workbench and will be until I have a day off again. the calibration still needs to be done with the sensors used

this drive the whole thing http://arduino.cc/en/Main/ArduinoBoardMega2560

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narumi I'll do it tomorrow

138 posts · joined Aug 2011 ·

#942306
the $10 16 x 2 display.. which you can probably get for less on e bay

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narumi I'll do it tomorrow

138 posts · joined Aug 2011 ·

#942307
due to the mounting position of the LCD, the backlight needed to be re-position which is a lot of hassle using the good old incandescent globe.
so multiple holes were drilled for the white 5mm LEDs

also the values are simulated, running off of a potentiometer, still need to spend a day or two making the signal amplifier for the fuel sender etc...

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donn Wolfsburg Elder

3,515 posts · joined Nov 2005 ·

#942315
Right, but I knew all that stuff 🙄
I dream of a day when a chicken can cross a road without being asked for it's motive!

Doug Sweetman Nil Bastardo Carborundum

2,128 posts · joined Sep 2002 ·

#942322
Nice ! Cool functionality and self developed, I like it !

vwjon Fahrvergnugen

914 posts · joined Jul 2006 ·

#942324
It looks fantastic, very impressive! but what the hell are you talking about?
3 1959 cadillacs
1 musso
2 early notchbacks
2 split kombis
2 split panels
1 split ute
1 low light panel
1 ex-pmg bay
1 country buggy
1 beetle ute
1 14" syncro caravelle
1 16" syncro doka
1 golf cabrio
1 vw camper trailer
2 3meter bombs

nils Fahrvergnugen

971 posts · joined Jan 2008 ·

#942338
Nice work indeed
Quit calling rust patina

SebastienPeek Custom Title Time!

1,657 posts · joined May 2011 ·

#942342
This is freaking awesome!

Arduino's are great fun and make stuff like this quite easy to do at home.
I have a couple lying around waiting for a rainy day myself.
The sold one, '73 VW 1303 - Zelda
The project, '74 VW 1303 - Gretl

vlad01 Compulsive Aussie Vee Dubber

4,270 posts · joined Jun 2010 ·

#942612
narumi wrote:due to the mounting position of the LCD, the backlight needed to be re-position which is a lot of hassle using the good old incandescent globe.
so multiple holes were drilled for the white 5mm LEDs

also the values are simulated, running off of a potentiometer, still need to spend a day or two making the signal amplifier for the fuel sender etc...
Nice!, this is the sort of crap I used to do a lot in school and tafe. I build a hand held oscilloscope but the sample rate was crap due to the limitation of the AD convertor built in to the chip. Could of used an external AD with better rates but I was lazy.

Are you using a PIC micro controller?

71 notchback,
Past owner of, 70 NB, 73 SB and 72 FB TLE

narumi I'll do it tomorrow

138 posts · joined Aug 2011 ·

#944033
Sorry for in-activity, busy with work and life and such.

Vlad, it uses Atmel ATmega 2560 on arduino framework
the code I have in there is pretty simple. calibration is hard coded so it needs a laptop for calibration.
it display calculated raw value with no buffer so the values such as fuel fluxuate as the car tilt, brake, corner etc.
the only impressive thing here is my old man's laser cutting by hand lol.

by the way I fried the MCU by feeding 12v into the 5v pin so the laptop won't see the the device anymore. but it still works.

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vlad01 Compulsive Aussie Vee Dubber

4,270 posts · joined Jun 2010 ·

#944276
nice. all you need now is to develop a board so you can enclose it all inside the gauge.

71 notchback,
Past owner of, 70 NB, 73 SB and 72 FB TLE

helbus Administrator Mad fabricator, paint and body

7,386 posts · joined Sep 2002 ·

#944291
Before I read the other comments my thoughts were 'impressive'. Then I see that you have definitely shown a number of people that it is impressive.

If you could develop this kind of work to fit to other old type speedo's then you would have a potential market of street machiners, hot rodders etc that want the info on the dash without the intrusion of 4 extra gauges.
EJ22 into Bay Microbus - Finished project build thread- click on this spot here for info

Doug Sweetman Nil Bastardo Carborundum

2,128 posts · joined Sep 2002 ·

#944311
+1 what he said....