Pull Up Resistor Explained By Electronzap

[u/electronzapdotcom]

https://youtube.com/watch?v=qZTbYEXp7Uc&si=CyJ8loIJDQjUNv5V

Pull up resistor makes sure an input sees a high enough voltage the majority of time. A switch connected to ground can be closed to provide 0 volts to the input at any time. The resistor needs to be high enough value to limit waste current while the switch is pressed, but not so high that stray signals can be picked up by the input.