This assumes a lot of extra skills and knowledge. As a Linux user I know RPi pretty well but piezoelectric is something I used to light gas, resistors are some

This assumes a lot of extra skills and knowledge. As a Linux user I know RPi pretty well but piezoelectric is something I used to light gas, resistors are something I studied at school (and things that heat), a diode... maybe, but clamping? I won't be able to put those pieces together. I'd buy a smart plug with a http url to call to turn it on and off and make a web app running on a RPi at home to manage that plug.