Car starter switch as normal 4 pos switch

Other Hardware General Electronics
1

Dear all,

I've got myself a basic car 4 position switch meant to be used as a normal switch, I know this is meant to be used with a specific circuit using a relay and a connection to battery, my intentions are pretty much using this as a normal switch being the last positions (starter) as a momentary pos

I noticed this switch does not have a ground connection, is there a way to wire this to be used as a normal 4 pos switch with my arduino

pins are B, ACC, ST, and IG

P.D: it's for a starter c172 flight sim

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2

Cessnas use 5-position switches: Off, Left, Right, Both, Start.

Wire B to ground. Wire the other 3 wires to Arduino inputs with pullups enabled. That will get you 4 positions, but not 5. Maybe you could hack the mechanism to allow one more position. With 3 outputs, you have enough information to determine up to 8 unique positions.

3

Don't you have an Ohmmeter?

B is battery, or the common.
ACC is the accessory line. It is powered from B when the switch is in the accessory or the ignition position.
IG is the Ignition line. It is powered from B when the switch is in the ignition or the start position.
ST is the start line. It is powered from B when the switch is in the start position.

(Just a guess from my experience of hot-wiring cars in the '60's. Fords were the easiest.)

4

I assume it's basically a single-pole [u]rotary switch[/u] with an off (no connection) position and a spring-return for one position.

In a car, there wouldn't be a ground position. You can ground any of the terminals as long as you don't create a "short". :wink: