My mother has a piano and a Microsoft Surface Pro. The former is good for playing songs while the latter is good for many, many things, including, but not limited to, playing songs. Also the display of sheet music for use with a piano. It would be perfect, really, if there was a way to change pages in a hands-free manner. One traditionally uses ones hands, you see, to piano.
I know what you’re thinking – there is! You can buy such things, but also you can make them.
Once I had that figured out (or while I figured that out), I had to design a model to house it. And, you know, act as a foot pedal. Luckily, I have an awesome 3d printer so models can come to life in only ten to fifty hours, or so.
The buttons fit into those two holes, and as you apply pressure to the pedal in either direction it presses them. It’s powered by USB, which also charges a battery so it can continue to work should it be disconnected. Here it is assembled!