Negative values not registering from equation - MK3

da40flyer
Posts: 1
Joined: Wed May 14, 2014 11:39 am

Negative values not registering from equation - MK3

Postby da40flyer » Mon Sep 08, 2014 2:28 am

I installed a string pot for my steering angle. I simply want it to record a negative 1 when the steering wheel is turned 1 revolution left and a positive 1 when the steering wheel is turned 1 rev to the right, and interpolate between those.

In the MK3, if my equation is simply "X", it correctly shows the voltage values of 2.254V when 1 turn left, and 3.932V when 1 turn to the right.

So I fit a line using these values

Voltage ___ Y
2.254 ___ -1
3.932 ___ +1

Giving this equation: Y=(1.19*X)-3.69

But if I use this linear equation, it only shows the positive values. basically when I turn to the right, it shows correctly, but when I turn to the left, it registers Zero always.

Please help.

Thanks,
David

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