Reed switch for VSS

A forum for discussing applications and implementations of the MegaShift transmission controller code for the GPIO from B&G. This can control up to 8-speeds and 6 shift solenoids (plus a 16x9 table for controlling a PWM line pressure valve). It has manual and fully automatic modes (16x9 load x speed table), with under and over rev-limit protection, and full data logging of all inputs and outputs (among many other abilities). A TransStim to test your completed board is also available.
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Addicted
Posts: 188
Joined: Mon Oct 14, 2013 7:14 am
Location: Winchester, England

Reed switch for VSS

Post by Addicted »

I've found that the VSS on my Audi is actually a reed switch and not a VR sensor.

I've already built my board for a VR input, what changes should I make to the circuit to use the reed switch? (it appears to be 12v from the factory, but I assume it will work with a 5v feed)

Is it going to be as simple as connecting the processor port to the sensor (via a 380ohm resistor) with a 5v pullup (1K?)?

More info if needed:

http://forums.quattroworld.com/s4s6/msgs/168463.phtml
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tobmag
Posts: 206
Joined: Mon Jan 02, 2012 4:22 am

Re: Reed switch for VSS

Post by tobmag »

Addicted.

You dont need to do anything, the VR circuit will work on a DC square wave signal as well 5 or 12volt.

BR//Tobmag
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Addicted
Posts: 188
Joined: Mon Oct 14, 2013 7:14 am
Location: Winchester, England

Re: Reed switch for VSS

Post by Addicted »

Great news, that was the final piece in the jigsaw puzzle.. :D






Now all I have to do is put it all together... :shock:
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zen
Posts: 49
Joined: Mon Jun 02, 2014 1:38 pm

Re: Reed switch for VSS

Post by zen »

lucky you!!

should remove most if not all vss issues most seem to have..square wave in!!
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