Building a Physical "Connections" Word Puzzle with RFID and ESP32

Dive into a comprehensive tutorial on building a physical version of the NYT "Connections" Puzzle using RFID technology and microcontrollers. Learn to create an engaging word puzzle that challenges players to sort cards into four groups with common connections. Explore the step-by-step process, from component overview and SPI interface explanation to tackling issues with counterfeit RFID readers. Discover how to use multiplexers, create wiring diagrams, and design schematics using EasyEDA. Master the technique of writing group data to RFID cards and delve into the ESP32 code listing. Perfect for educators, event organizers, or escape room designers looking to craft an infinitely replayable and interactive word game experience.

00:00:00 - Introduction
00:00:57 - Play along!
00:01:05 - Solving the puzzle
00:03:49 - Component Overview
00:06:52 - SPI interface
00:10:32 - The problem with counterfeit MFRC522 readers
00:12:01 - Using multiplexers to isolate readers
00:14:53 - Wiring diagram
00:15:41 - Schematic and PCB design in EasyEDA
00:16:22 - Writing group data to RFID cards
00:19:55 - ESP32 Code listing
00:42:24 - Wrapup