First of all I am a beginner in electronics / electricity. I am currently trying to connect a coffee machine to a Raspberry Pi powered relay.
No problem with that, but as I am going to put apart and rewire a coffee machine, pretty dangerous heating device after all, I wanted to fully understand its wiring diagram beforehand.
That's where I'm stuck. This is the diagram I drew of it.
I could understand that the three pin device in the middle is a rocker switch. The thing I don't get is the use of the third pin in such a device. What if there were only two pins int the switch, and the wires connected to the upper right one were just fixed together ?
Thanks in advance!