Small OLED screens for microcontrollers are a cheap and easy way to display more detailed output for your Micro:bit than the scrolling LED matrix allows. Often sold as 0.96″ screens, these are just under 25mm
A rotary encoder, such as the common KY-040 above, is a knob that you can turn continuously either clockwise or anti-clockwise and detect which direction it is being turned. Types such as the KY-040 are
About Buttons Microcontrollers such as the Micro:bit all do one similar thing, accept an input (some sort of ‘message’ from the outside world), process (run some code) and output (show something to the outside world).
NeoPixels are Adafruit’s brand of individually addressable RGB LEDs. However the name has become common use to describe most kinds of WS2812 (and similar) LED arrays. Each LED can have it’s colour set individually using