Hi, as part of a remote controlled lawn-mower project, I am tinkering with a battery powered lawn-mower.
I want to turn it on/off remotely. I was planning to control the switch via a MOSFET or optocoupler - easy.
However, when disassembling the switch-box, I found a duo - microswitch:
It has 3 cables connected. In off-state the voltage is as shown:
The control circuit is potted, so I cannot get more information of the wiring.
This setup sparked my interest. Why is there a third cable? What setup would you expect in the control unit?
I could emulate the duo-switch with a 2 channel relay board, but I would want to understand the setup first.
Many thanks to all replies helping to solve the mystery.