Manually controlled WS2812b LED strip with EC11 rotary encoder - Arduino for beginners - with code

How can we manually control a series of LEDs using a rotary encoder?
This can be useful for signaling the volume size of a digital potentiometer.
Or its use can be in various applications with which to adjust a value, which is displayed with a series of LEDs.
The limit is just your imagination.

Hardware required:
-rotary encoder EC11
-arduino nano
--15 LEDs from a ws8212b strip at 5V or you can use neopixel rings

Track: Jim Yosef & Shiah Maisel - Slow Down [NCS Release]
Music provided by NoCopyrightSounds.

[koushikdas]

Is it possible to add more addressable leds or its dixed to 15?
Is it possile to switch small DPDT relays instead of the leds? Great channel.

[JhonRhenBorden]

Thank you so much sir for sharing your knowledge, it's very informative. if ever sir that I want to move my rotary clockwise and I want to make happen to my led is every passable will not turning off. its look like a fuel gauge concept, may I know what code I gonna use?