CityEl Tacho - roll over?

[zaprodk]

Hi. Anyone have information on what happens on the latest Tacho (1998 ->) when it reached 99.999 km? does it roll over to 00000 like the old mechanical counters?

I am moving tacho from donor vehicle into another vehicle with lower kilometers. Apparently no one knows how to reset the counter or access to a fresh CPU with no odometer reading, so i was thinking about connecting the tacho to a signal generator and "drive" the odometer until it zeroes out, but i wanted to make sure that it indeed does this.

Regards,
Per.

 

[Kamikaze]

I have not yet witnessed this, but what else is supposed to happen?

 

[Sascha Meyer]

Hi Per,
same at me, not a single clue. But nevertheless, be heartily welcomed here in this forum.
Btw., where do you come from? We connected to quite some countries..


Greetings from Saarland, Sascha

 

[zaprodk]

Kamikaze: Yeah, what happens? Maybe it's stuck at 99999 and needs a new chip, or it will just roll over. I guess there is only one way to find out.
Sasha, I'm in Denmark.
Using a CityEl from 2000 as a donor for a MiniEl from 1988.
All driveline components have been fixed and moved over, next job is electrics.

 

[Kamikaze]

I guess the "old and wise ones" here might have witnessed a rollover (or even multiple ones for that matter).
@wolfgang dwuzet @Enno @Peter End. @Horst Hobbie @Christian s

 

[Sven Salbach]

Yes, mine has 119890km at this moment and show 19890km
Mine City EL is nearly brand new

 

[Sven Salbach]

Why are you laughing? The City El is so fast that time runs backwards on the highway.

That's why I'm getting younger and younger when I drive the El

 

[Kamikaze]

The City El is so fast that time runs backwards on the highway.

 

[Sascha Meyer]

Kamikaze: Yeah, what happens? Maybe it's stuck at 99999 and needs a new chip, or it will just roll over. I guess there is only one way to find out.
Sasha, I'm in Denmark.
Using a CityEl from 2000 as a donor for a MiniEl from 1988.
All driveline components have been fixed and moved over, next job is electrics.

Hi Per,
do you join us in our traditional Ellert Træf, this year happening in Aabenraa?
Have a look here..

oh, just saw you are active in the danish facebook group, so you will be well aware..

Mange Hilsen fra Tyskland, Sascha

 

[zaprodk]

Hi Per,
do you join us in our traditional Ellert Træf, this year happening in Aabenraa?
Have a look here..

oh, just saw you are active in the danish facebook group, so you will be well aware..

Mange Hilsen from Tyskland, Sascha

Sascha, I'm not planning to, sadly. Too many projects at home at the moment, and it's a very long drive for me (i'm on Sjælland)

 

[zaprodk]

I can report that it indeed rolls over as expected. I connected up a signal generator (Arduino + optocoupler) and left it overnight. Sadly my calculations were a bit off so instead of the count being near 00000 when i went back into the lab today, it was 1900 something. So i'm taking it for a spin again This time i've calculated how long and have it stop before it turns over.

 

[Kamikaze]

I guess you broke the record for daily kilometers on an EL-speedometer then.
Which drivespeed are you simulating? (Maybe you broke a record there, too...)

 

[zaprodk]

I guess you broke the record for daily kilometers on an EL speedometer then.
Which drive speed are you simulating? (Maybe you broke a record there, too...)

It's driving 135 km/minute. Probably the fastest CityEl in existence
Also, the button under the display, how is it supposed to work? It doesn't react when i press it.

 

[Kamikaze]

Mach 6,65... not bad.

 

[zaprodk]

Yeah, i guess the designer of the code on the microcontroller made leeway for upgrading the motor and mounting wings ?.
It cannot go any faster since it takes too much CPU time (the counting is interrupt-driven) so the LED displays starts flickering wildly and eventually locks up if going any faster.

 

[Kamikaze]

Maybe you could post your arduino-code and the wiring-schematic here so it is reproduceable if someone else wants to reset his/her km-count as well?

 

[zaprodk]

sure.
Code:

void setup() { pinMode(9, OUTPUT);
}
void loop() { digitalWrite(9, HIGH); // turn the optocoupler on. delayMicroseconds(100); // wait for a short moment digitalWrite(9, LOW); // turn the optocoupler off. delayMicroseconds(70); // wait for a short moment
}

On the Arduino, I have a generic optocoupler (PC817) connected with a 180 ohm resistor in series. The output of the opto is connected to GND and pin 3 of the dash.

 

[Sven Salbach]

" the button under the display, how is it supposed to work "
This switch between Daily km and total km

 

[zaprodk]

" the button under the display, how is it supposed to work "
This switch between Daily km and total km

Yes, so much i understood from reading the handbook. It just doesn't do anything on mine.

Before pressing "send" i went to test the buttons for continuity. Both broken! No signs of moisture damage. I went to find some new buttons in my stockpile but didn't find any with the same height of the pin in the middle, so i carefully took the switches apart to clean them from corrosion, and see what I found - a bunch of hardware bugs!

After cleaning the bugs out the switches works once again