Are there projects for a homemade remote with Arduino at 433 MHz?

Question

Arduino

Quite a lot of homemade projects that use ready-made remotes with an "as is" radio interface are not protected from pranksters and pests. That is, the "control node" on the Arduino (and the like) simply receives some kind of signal and performs an action. At the same time, there are no particular difficulties in making the signal dynamic, encrypted, signed, etc. However, it is remote controls in the everyday sense (that is, for light, curtains, a fan) that somehow do not come across, mainly it is about controlling some models of cars / planes or about communication between devices (remote temperature sensor, radio key in a car to open gate). I would like to look at the implementation of the remote control, perhaps based on the existing IR or RF remote control, in which they placed some small popular Arduino Nano or Digispark board, because there are a lot of consoles where it will fit. At the same time, important points are: connecting buttons (of which there are quite a lot in conventional remote controls), battery power, signal encoding, etc.
Maybe someone met such a project or knows where to dig in terms of the case (but not manufacturing from scratch)?