Re: SMT switch, what's it called? (it's like a bubble)
It is called a 'tact switch', see the bottom of this page for some examples:
**broken link removed**
No need to open up the switch, you could just solder to the edges (there is no electrical contact in the center of the
entire switch.
You can see where you need to solder in your photo, to the bottom left solder point, and the bottom right point.
The contacts at the top are alternatives you could use (and you could check with an ohmmeter with the power switched off to
confirm).
Agreed it is quite small, but it is possible to solder. Use fine solder, fine soldering iron, and fine wire (e.g. something like 30awg
kynar or tefzel which you can google for; the wire is single-core, after you've soldered it to the point, use some epoxy to secure it
and provide a bit of mechanical strength to the insulation, not just the stripped wire portion.
To electronically activate it, you could either use a relay, or you need a voltmeter (or scope) to see if it is switching a contact to
ground, or some other voltage. Then you could use a BJT or FET.