Adding momentary push button with led and other button function

[Wheaten]

please stop cross posting.

GPIO Pins to control volume

Hi buckler I’m new to adding some button and rotary knob for rpi 3b+ /4b I just want to learn and explore how can i add those button and knob. 1st question, is it necessary to add resistor like 10k ohms/resistor to the GND wire from pi gpio and button? 2nd,can i use some rotary knob from local online shop like this? And do some execution as you posted? Lastly, for shutdown button or open button i want to use momentary push button with led light like in the picture below, Can you provide me …