avr - What is the purpose of a pull-up resistor in a microcontroller

Pull Up Resistor Wiring

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Arduino tutorial for complete beginners: using a button

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Arduino Tutorial for Complete Beginners: Using a Button | raywenderlich.com
Arduino Tutorial for Complete Beginners: Using a Button | raywenderlich.com

Pull up resistors

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Guide to Pull up / Pull down resistors and its usage - Gadgetronicx
Guide to Pull up / Pull down resistors and its usage - Gadgetronicx

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Pull-Up and Pull-Down Resistor - Electronics Tutorial
Pull-Up and Pull-Down Resistor - Electronics Tutorial

Circuit patterns, part 3: pull-up and pull-down resistors

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rOmV4 - Resistors
rOmV4 - Resistors

L1: using buttons

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transistors - Why do we use pull up resistor with PIC? - Electrical
transistors - Why do we use pull up resistor with PIC? - Electrical

avr - What is the purpose of a pull-up resistor in a microcontroller
avr - What is the purpose of a pull-up resistor in a microcontroller

Pull-Up and Pull-Down Resistor - Electronics Tutorial
Pull-Up and Pull-Down Resistor - Electronics Tutorial

Importance Of Pull Down Resistor
Importance Of Pull Down Resistor

Pull Down Resistor In Arduino
Pull Down Resistor In Arduino

Pull Up Resistors - Tinker Hobby
Pull Up Resistors - Tinker Hobby

Arduino INPUT_PULLUP Explained (pinMode) - The Robotics Back-End
Arduino INPUT_PULLUP Explained (pinMode) - The Robotics Back-End

L1: Using buttons - Physical Computing
L1: Using buttons - Physical Computing