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
Apologies for not posting over the weekend. I have been very busy training Cloud and helping out becaust the riding school is back open. The virus never really hit Jorvik so Dundull Stables Riding School
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).