Home made Cal Switch

[RICE RACING]

As an added note...

Then put the GND wire on 1 and the input wire on the common contact of the switch and hey
presto, 12 positions. It should generate the following voltages :

0.00, 0.42, 0.83, 1.25, 1.67, 2.09, 2.51, 2.92, 3.34, 3.75, 4.17, 4.59

Pat.

Not sure I'm understanding?

The pullup in the ECU is on the switch centre contact...the pullup when not using the ECU pullup is *also* on the switch centre contact, so behaves the same.

I'm probably missing your point

Pin 1 = ANG
Pin 12 = 5+Vin
Center Pin = Vout

There is no 3300 ohm resistor in Pats description of the 2 wire set up and in my sheet calc I use the 3000ohm listed value of the pull up being ON in Th mode, thus the confusion and my original questions about his Vout voltages he put up and you agreed they were maybe wrong?

In three wire hook up mode I dont get anything to work as listed on paper, thus the questions before I start trying to make one!

I think I will just stick with my original if I cant work a generic 2/3 wire switch out

[TimH]

Whatever was said, the generic 3-wire pullup to 5V must be to the centre contact not to position 12. Then you either connect the wire from the switch's pullup to 5V, or you don't (and if you don't, then you use the pullup in the ECU...which will be to the centre contact...as I said!)

[RICE RACING]

So is the pull up in the ECU on TH channels (when selected in software) 3k or 3.3k?
When off in software there is no pull up on the said channel? (5v input mode).

[TimH]

3k on an S6 - I assume it's the same on an S8. No pullup when set to 5V mode for sure.

[RICE RACING]

3k on an S6 - I assume it's the same on an S8. No pullup when set to 5V mode for sure.

yep its the same, one of them is 47k but all other TH are 3k listed. Thanks, I will rework my maths and see if I build one of these to test

[RICE RACING]

This is what they are getting put to use on
My D5 display unit steering wheel system...........
Dash buttons and NOS button installed, almost finished.