How to get additional 5V (or 3.3V for 3.3V boards) and GND pin from Arduino - YouTube
L1: Turning on an LED - Physical Computing
L1: Turning on an LED - Physical Computing
Microcontroller Pin Functions – ITP Physical Computing
IC power-supply pin - Wikipedia
Arduino Digital Gpio Of Arduino | Arduino
Arduino Uno USB ground connected to ground pins - IDE 1.x - Arduino Forum
arduino - How to connect one pin to ground when an another analog pin is triggered - Electrical Engineering Stack Exchange
Introducing pins layout, pins numbers and pins meaning on | FLLCasts
micro:bit pins
Weird GND in ESP32 (GND or GPIO 11?) - Microcontrollers - Arduino Forum
Can any Arduino pin be 'used as ground'? - General Electronics - Arduino Forum
How to connect SGND and GND pins in LTM4646 and LTM4622 - Q&A - Power Management - EngineerZone
Does a circuit going into an Arduino pin/GND need a resistor? - Electrical Engineering Stack Exchange
Can you use Arduino Digital I/O pins as GND and +5v? - Project Guidance - Arduino Forum
ESP8266 NodeMcu Pinout – ESP8266 Shop
Arduino Uno Pins - A Complete Practical Guide - The Robotics Back-End
ESP8266 Pinout Reference - Last Minute Engineers
Connecting multiple Grounds to one Arduino pin - General Electronics - The Contextual Electronics Forums
The Basics of Arduino: Reading Switch States
How to convert any pin into ground pin in Arduino | Arduino tutorial|How to get more GND in Arduino? - YouTube
General Raspberry Pi I/O pin explanation - Sim Innovations Wiki
