Internet Radio with Bluetooth Audio Streaming

This internet radio system is powered by a Lilygo T-Display S3 microcontroller, which features an integrated ESP32 chip capable of connecting to local Wi-Fi networks and utilizing Bluetooth audio streaming. When operating as an internet radio, the ESP32 fetches digital audio streams over the internet using its Wi-Fi connection. Alternatively, it can receive wireless audio data via Bluetooth from a smartphone or other compatible host device. Once the digital audio stream is processed by the ESP32, it transmits the audio data out via the Inter-IC Sound (I2S) digital audio protocol. This I2S signal is fed directly into the MAX98357A Class D amplifier breakout board, which converts the digital audio signals into amplified analog power suitable for driving a physical load. The MAX98357A powers a 5W 4 Ohm 40mm speaker to produce audible sound output. For user interaction and visual feedback, the Lilygo T-Display S3 provides an integrated display screen, allowing users to view station information, menus, or track data. The entire assembly is powered independently by an 18650 lithium-ion battery housed in a dedicated battery holder, regulated through an ON/Off rocker switch for safe power control. A U.FL Wi-Fi antenna ensures reliable wireless connectivity, while all hardware components are housed neatly inside a custom 3D-printed enclosure connected using standard wiring.