Overview of the MAX98357 I2S digital audio amplifier and how digital amplification works. Explains I2S signals, wiring to ESP32, speaker/audio format selection, and an ultrasonic warning project that plays WAV audio when distance stays in range.

This article explains what RFID is and how it works. It shows the differences between tags, cards, and stickers, demonstrates how to read RFID tags with Arduino and MicroPython, and presents a practical RFID-based office time logging project.