Setting up I2S with the MAX98357 was easier than the PCM5102, but WiFi streaming has its own challenges. Buffer underrun, latency, automatic reconnection...

HIOS WiFi Speaker

Parlante WiFi con ESP32, amplificador I2S MAX98357 y control via web.

Quick Start

# Clonar el repositorio
git clone https://github.com/hios-open-systems/web.git
cd web/projects/speaker

# Subir firmware (PlatformIO)
pio run -t upload

# Monitor serial
pio device monitor

Que es?

Speaker portatil con conectividad WiFi que permite:

Reproducir audio desde cualquier dispositivo en la red local
Control via interfaz web (http://hios-speaker.local)
Audio digital I2S de alta calidad
Bateria recargable USB-C

Hardware

Componente	Funcion	~USD
ESP32 DevKit	Micro + WiFi	$8
MAX98357	Amplificador I2S	$3
LM2596S c/Display	Fuente 5V	$4
2x 18650	Bateria	$12
Cargador USB-C 2S	BMS	$5
Speaker 63mm 4ohm	Parlante	$3
Total		~$35

Ver detalles en COMPONENTS.md

Conexiones rapidas

ESP32 GPIO25 → MAX98357 DIN
ESP32 GPIO26 → MAX98357 BCLK
ESP32 GPIO22 → MAX98357 LRC
LM2596 5V    → ESP32 VIN + MAX98357 VIN

Ver diagrama completo en PINOUT.md

Estructura del proyecto

speaker/
├── README.md           # Este archivo
├── COMPONENTS.md       # Especificaciones de cada modulo
├── PINOUT.md          # Diagrama de conexiones
├── ASSEMBLY.md        # Guia de armado paso a paso
├── TROUBLESHOOTING.md # Problemas comunes
├── platformio.ini     # Configuracion PlatformIO
├── src/
│   └── main.ino       # Firmware principal
├── tests/
│   └── test_basic.ino # Test de hardware
└── pics/
    ├── modules/       # Fotos de componentes
    └── build/         # Fotos del armado

Estado

En desarrollo - Prototipo funcional en progreso.

Licencia

Open Hardware - Usa, modifica y comparte libremente.

HIOS - HI Open Systems

Specifications

AudioI2S digital, 44.1kHz 16-bit

AmplifierMAX98357A, 3.2W @ 4Ω

ConnectivityWiFi 802.11 b/g/n

Battery7.4V 5000mAh (2x18650)

Battery Life8-16 hours estimated

ControlWeb interface, mDNS

Bill of Materials (BOM)

Componente	Cant.	Precio	Notas
ESP32 DevKit V1	1	$8	WiFi + Bluetooth
MAX98357 I2S Amp	2	$6	3W Amplifier x2 (stereo)
LM2596S w/Display	1	$4	Adjustable 5V supply
18650 Battery	2	$12	Li-Ion 3500mAh
USB-C Charger 2S	1	$5	BMS with protection
Speaker 63mm 4Ω 3W	1	$3	Full range speaker
Approximate Total		$56 USD	Shipping not included