An adjustable potentiometer can open up many interesting user interfaces. With this rotary potentiometer just turn the dial and the resistance changes. This potentiometer from Bourns has a ¼" metal knurled shaft diameter, PC pin terminals, no detents, and has a 100K logarithmic taper. Connect VCC to an outer pin, GND to the other, and the center pin will have a voltage that varies from 0 to VCC depending on the rotation of the pot. Hook the center pin to an ADC on a microcontroller and get a variable input from the user! https://elecena.pl/product/14430604/rotary-potentiometer-100k-ohm-logarithmic-panel-mount 2018-04-06 https://elecena.pl/product/14430604/rotary-potentiometer-100k-ohm-logarithmic-panel-mount 2018-05-05 https://elecena.pl/product/14430604/rotary-potentiometer-100k-ohm-logarithmic-panel-mount 2019-01-18 https://elecena.pl/product/14430604/rotary-potentiometer-100k-ohm-logarithmic-panel-mount 2022-02-21 https://elecena.pl/product/14430604/rotary-potentiometer-100k-ohm-logarithmic-panel-mount 2023-12-23 https://elecena.pl/product/14430604/rotary-potentiometer-100k-ohm-logarithmic-panel-mount 2025-04-11 https://elecena.pl/product/14430604/rotary-potentiometer-100k-ohm-logarithmic-panel-mount 2025-04-14