I want to add a relay or transistor, what fits the need best, to a simple switch, so I can control the switch by a micro computer but also keep the already installed switch so I can still operate the mechanism by hand.
Here a little sketch of what I thought of (sorry, I'm new to electronics so forgive me if this is a dumb question :D)
(on the left side is the current situation and on the right side is what I thought of, the blue box is the "electronic switch" (transistor, relay, ..), I didn't add its control wires to keep the sketch simple.
As long as the "box" can handle the load this should work, right? Am I missing something here or is it safe to start building?
Edit: I'm thinking of 2 scenarios here:
1st: Add a remote controlled power button to my pc (since it's a small DC a small transistor would be enough). Of course I would have to turn it off again after a few milliseconds.
2nd: Add a relay to a light switch (230V AC), but here I could have the problem winny mentioned (if one switch is on, the other one cant turn it off), so this wouldn't be the first application to start