What the 16×2 LCD is, wiring it the hard way vs. with an I2C module (4 wires instead of 12), scanning for the I2C address, and a full set of open-source text effects and animations.

Objectives: Wire an LCD with and without I2C · Explain why I2C saves pins · Scan for an I2C address · Print live values

Components: 16×2 LCD · I2C module (PCF8574) · Arduino Uno · breadboard & wires

Code: https://github.com/Arun-Roshan/16×2-LCD-Text-Effects.git — 16×2 LCD repo

Chapters: Intro · LCD · Why I2C · LCD without I2C demo · Types of LCD · LCD pins · Connecting to Uno · Code explained · Uploading · Scanning I2C address · Text effects