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A comment on If You’ve Got a New Car, It’s a Data Privacy Nightmare. Parent comment

Re:If You’ve Got a New Car, It’s a Data Privacy Nightmare by marcosdumay on Wednesday September 06, 2023 @10:54AM (#37406083)
It shouldn't be expensive to make an I2C smart-switch that allows you to place as many buttons as you want on a single set of 3 wires (or 4 if you want a simpler circuit).
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Re:If You’ve Got a New Car, It’s a Data Privacy Nightmare by owenmarshall on Wednesday September 06, 2023 @10:57AM (#37406121)
https://en.m.wikipedia.org/wiki/CAN_bus

Modern cars do it with two wires.

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Re:If You’ve Got a New Car, It’s a Data Privacy Nightmare by mschaef on Wednesday September 06, 2023 @11:09AM (#37406286)
LIN bus also https://www.csselectronics.com/pages/lin-bus-protocol-intro-...
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Re:If You’ve Got a New Car, It’s a Data Privacy Nightmare by marcosdumay on Wednesday September 06, 2023 @12:10PM (#37407167)
Hum, it's terminated with resistors on both sides, so the boxes need power. That makes it 4 wires.

I imagine there's very little difference on cost between 3 or 4 wires. But the number of nodes described is not really compatible with making each button its own node.

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