Arduino Turorial: How to use a button with Arduino Uno

Arduino Push Button Tutorial (step by step)

The Simplest Way to Wire a Button to Arduino (with Internal Pull-Up) | Arduino Button Tutorial

Not enough Arduino Pins? Try this I2C Port Expander! | Chip Tips #1: PCF8574

The Ultimate Guide to Using Arduino Pins for Input and Output

How Digital Pins Work (INPUT Mode) - Arduino Tutorial for Beginners 14

How to Use Push Buttons on the Arduino - Ultimate Guide to the Arduino #7

Push Button and LED with Arduino(code explained) | Control LED with push button | Arduino Tutorial 3

Arduino Tutorial 34: Simplest Way to Use a Pushbutton Switch