This is a very simple project that took me like 45 Minutes to design and program and 6 hours to print, but that I wanted to do since a lot of years and that it became forgotten in my memory.
I play different air instruments (Low and Tin whistle and another types of flutes) and I have had always struggles with digital sheet, so I wanted a custom pedal with the left and right arrow keys in it.
Now I am using it not only to change the page while playing music, but also for custom actions. For example, I am learning in the Website Freecodecamp and I need to click 2 time the combination Ctrl+Enter, and after 3 times to doing it became really boring, so I made custom action to play Ctrl+Enter wait some milliseconds and then again press Ctrl+Enter. 4 clicks to only 1 click.