Raspberry Pi Advanced Guide (wiringPi Tutorial, C Programming, GPIO Buttons, POSIX Multi-Threading)

This 2-part Raspberry Pi GPIO tutorial shows how to correctly use buttons with wiringPi (C Programming). While I use the buttons to control LEDs, you can use the same approach with any other electronic components (or code in a subroutine/function in general).

If you are using Raspberry Pi 4 you may receive an error when attempting to use the gpio command. Follow this guide to fix it:
http://wiringpi.com/wiringpi-updated-to-2-52-for-the-raspberry-pi-4b/

Part 1 video gives a general overview of wiringPi as of today, explains the concept of pull-up and pull-down resistors and demonstrates the circuit used in this tutorial.

Part 2 video covers the C coding part of this project, including:
- GPIO port initialization and safe deactivation
- Asynchronous button handlers using wiringPi interrupts
- Button de-bouncing using time and sampling methods
- Button callbacks using POSIX multi-threading

0:00 Intro
0:14 Basic Program Setup
2:24 Basic Button (Naive Method)
3:10 Basic Button (Interrupt Method)
4:52 Button De-Bouncing (Method 1 - Time Interval)
7:51 Multi-Threaded Button Callbacks
10:10 Button De-Bouncing (Method 2 - Sampling)
11:30 Wrap-Up

Full code: https://github.com/mheidenreich/buttons.c/
(Note: code posted may contain small updates and/or bug fixes not shown in the video)

Disclaimer:
"Raspberry Pi" and the distinct logo are a trademark of the Raspberry Pi Foundation.

Music: Endless Motion By Bensound.com, https://www.bensound.com/