Hi all, I'd like to find a sensible way to achieve my goal here, I've had some ideas but struggling to refine it. The idea is, to have an Arduino nano (or similar) receive inputs from 3 different steering wheel controllers (menu buttons, audio control and cruise control), send those via I2C to anot…

One solution is to use one of these tiny SSR in place of the buttons. Each would be controlled by the arduino. https://www.digikey.com/en/products/detail/ixys-integrated-circuits-division/CPC1017NTR/655290 [image]

It is indeed being used in a motor vehicle, but for the purpose of controlling a radio. I understand the liability concerns, however it should reassure you that I am a qualified mechanic and specialise in auto electrics. I am well aware of any and all safety concerns with regards to modifying and in…

[image] lemur2906: send those via I2C to another Arduino which can then react to those signals. What is the reason for not having the first Arduino do all the work?

I have many years in the design of OEM electronics. Here is few notes of what is involved, it should all be familiar and make sense as you have an auto electronics background: Valuable Resources for Automotive Electronics: STMicroelectronics Application Note AN2689: This application note provid…

[image] lemur2906: This boils down to, how can I replicate a voltage ladder button matrix electronically controlled by Arduino? It's very simple you just need a few small MOSFETS in place of the pushbuttons.

As the buttons are on the steering wheel, the signal is being passed via the clock spring. The clock spring has only one 2 unused wires, which will be 12v and a signal wire. The earth will be shared. Therefore I have only one signal wire available to me, which is insufficient for handling the signal…

Would that be using MOSFETs on the actual button hardware itself? As these are fitted to the steering wheel and I need the voltage ladder "recreated" off of the steering wheel. I could possibly dismantle a second set of steering wheel buttons and control that set with MOSFETs via the second Arduino? …

That seems like some fantastic info, thank you very much. I will definitely find some time to read through some of that :+1::+1:

[image] lemur2906: I need the voltage ladder "recreated" off of the steering wheel. If you are not using the actual buttons, then why the need for the ladder network. You can just connect each buttonn to separate Arduino pin. Never mind I now understand what you want to do.

Do you know what the voltages are on pins 11 and 12 of that female connector? Is one ground and maybe the other 12V?

Passing steering wheel control signals via I2C

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TomGeorge December 20, 2025, 2:12pm 11

Hi, @lemur2906
Welcome to the forum.
This is your image from post #1.

You can post images directly into your post which will make it easier for members to read.

Tom....

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Passing steering wheel control signals via I2C

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