button connection without connection to 5V pin - Arduino Stack Exchange
AnalogRead inconsistency when powered with USB vs 5V/VIN - Classic Nano - Arduino Forum
Arduino Mega 2560 Rev3 — Arduino Official Store
Digital read serial Arduino - Diagram + Code + Video
The Basics of Arduino: Reading Switch States
The Basics of Arduino: Reading Switch States
Can you use Arduino Digital I/O pins as GND and +5v? - Project Guidance - Arduino Forum
Arduino Digital Gpio Of Arduino | Arduino
Android Basics and User Interfaces
L2: Blinking an LED - Physical Computing
Lab: Digital Input and Output with an Arduino – ITP Physical Computing
Tutorial 17: Using a Button with Arduino - Programming Electronics Academy
Arduino INPUT_PULLUP Explained (pinMode) - The Robotics Back-End
Arduino Uno - 5V to input pin - General Electronics - Arduino Forum
Arduino returns HIGH on digitalRead after the input is disconnected - Project Guidance - Arduino Forum
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PHYS 432 - Buttons and Lights
electronics - Can you use an input pin instead of ground in Arduino circuitry? - Arduino Stack Exchange
How to Use Analog Pin as Digital Pins in Arduino
Digital Input -How to use the button with Arduino. - Robo India || Tutorials || Learn Arduino || Robotics
What is behind the Arduino 'GND pin'? - Quora
Multiple Push Buttons on One Arduino Input | The DIY Life
