using factory cruise buttons

[cwhite951]

I would like to implement the cruise control in my project (LS3 in a TJ Jeep). Don't really use it much, its more of a technical challenge to make it work. The factory buttons on the steering wheel have 5 total buttons. they are on one wire and work by engaging a resistor when each is pushed 

Wondering how to use this with my Link ECU (its DBW with speed input)

[Vaughan]

Hook it up to an analog input with a pullup to 5v on the input too (I assume the resistors pull to ground). Unsure of what resistance pullup you would want without sitting down and doing some math.

You could also use a spare an temp input which has a built in pullup of 1k for temp 3 and 4 or selectable pullup of 1k, 10k or no pullup on temp 1 and 3.

[cwhite951]

i'm thinking assigning a voltage based on the resistance into the analog cruise input is the way to go. I don't have wheel speed but transmission output speed should work fine.

[Laminar]

2 hours ago, Vaughan said:

You could also use a spare an temp input which has a built in pullup of 1k for temp 3 and 4 or selectable pullup of 1k, 10k or no pullup on temp 1 and 3.

I already went through the hassle of wiring in a pullup resistor to the 5V ref for my resistive cruise buttons, I didn't think of using a temp input like that. I may have to go redo that wiring to free up a normal AI.

[Adamw]

I would use a pull-up of around 5-6Kohm based on those resistances. 

[cwhite951]

2 hours ago, Adamw said:

I would use a pull-up of around 5-6Kohm based on those resistances. 

thanks. This is all because I have an issue with having buttons that don't do anything! Probably never going to use them but they better have functionality if they are there!

[koracing]

I know those feels...