Adjustable potentiometers can open you up several great user interfaces. Turn the knob and the resistance changes. Hook the center pin to an ADC on any microcontroller and get a variable input from the user. These little guys are breadboard friendly as well.
We believe that a good shipping experience is what makes our customers return. We want you to be happy and satisfied with your purchase at Circuit-Pop. We have a 24 hour customer service should you have any inquiries regarding your purchases, please contact us at firstname.lastname@example.org. Shipping times can take from 2-4 weeks to be delivered, and we have tracking services so you can follow your purchase right to your door!