Quantity   Component name
10 × Momentary Pushbutton Switches The standard square ones with the round black button that are in everything
5 × Rotary Encoders with Momentary Push-Buttons https://www.amazon.com/gp/product/B07DM2YMT4
1 × Teensy 3.2 Microcontroller with a bunch of fun features that I'm only using a sad fraction of.
1 × 40-Pin DIP socket Optional
1 × 330 Ohm bodge resistor 330, 1k, whatever gets a '1' to look like a '1'