Potentiometer Part 1

Potentiometer (a three terminal resistor), a nob that provides variable resistance.

Second example from Sparkfun varies the speed of an LED blinking, and from the Arduino IDE Basics example Read Analog Voltage.

First the Sparkfun example:

Instructions and code at: https://learn.sparkfun.com/tutorials/sik-experiment-guide-for-arduino---v32/experiment-2-reading-a-potentiometer

Wiring and items used diagram

What it really looks like

The video shows what the programme and the components actually do, as you turn the nob on the Potentiometer it varies the speed of the LED blinking. Cannot say I fully understand the programme, but do get the gist of what each line does.