Motors of old car Dashboard

Other Hardware Motors, Mechanics, Power and CNC
1

Hello everyone.

I've got an old Car Dashboard, which i would like to drive with the Arduino. Maybe later i will include this into my Racing rig.
I've done some Arduino Projects and got some basic knowledge about electronics.
Ive stripped the Dashboard appart to look whats inside. I looked at the RPM counter and there is little motor.

I've done many research and find out that this thing is named air-core meter. I hope this is correct. There are some infos around the Internet, but since english isn't my nativ language there sometimes hard to understand.

The I on this tiny Board is named SE094 5R30A. I tried searching for a data sheet but can't find anything.
The little PCB has 3 connections, named IG+, GND and SIG. The air-core itself has 4 Pins.

Since i can't find anything about the ic i soldered 4 wires directly to the aircore.
With a slimpe digitalwrite Code whih switch one output on abfter another, I was able to get a full 360 turn. But this only in 4 stages, because of the Code.

So i conneted the irst coil of the motor o arduino and run a pwm signal with a for loop from 0 to 255 and i can get the needle to move up to about 4500 rpm which will be about 1/4 of ta full 360° rotation.

From all what I've found out and hopefully understand right, i need now the second coild to be turned on and the first turend of, at the sime time and reset pwm signal to 0 and let it increase again to 255 to get a full 180° movement.

But i really cant get this working. I hope someone can help me. Maybe you have a link with a piece of code or something.

Thanks

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2

HTTP error 403, forbidden....

3

Fixed,
sorry didn't see i can upload them directly to forum.

4

Interesting motor - its possible a small induction motor pushing against a hairspring,
so basically a torque motor used to drive a needle. You may need a varying frequency
of quadrature drive into the two sets of coils to push the rotor round to various degrees.

5

Yeah, they look ery interessting. I think I've got it, i found a code on net http://xisantix.weebly.com/e-gauge.html

With this code and L293D i'm able to drive this motor.

6

That's not an old car. There is an IC in the dashboard.

...R

7

Great, that means I'm not old!

So it looks like these dial "motors" have a permanent magnet rotor and two
quadrature windings each a helmholtz pair, roughly. The spring may just be to
return it to zero when the power is off.

8

Hello Tombo89. I tried looking into the code, but get the "not found"page. Would you happen to have a copy of the code?

9

This thread is dead, its more than 2 years old.