SleepSoundBox

A ESP32 based ambient sound player for sleep.

Overview

SleepSoundBox is a sleep background music device, it plays looping ambient sounds (brown noise, nature sounds, fire) stored on the SD card, controlled by buttons.

Hardware

• ESP32 Dev Module
• MAX98357A I2S amplifier
• MicroSD card reader module
• Speaker (Flip5 internal speaker, 3 Ω / 20 W)
• pushbuttons

Features

• Plays .wav files (16-bit PCM, 22 kHz) directly from SD card
• Each button triggers looping playback from a specific folder
• 30-minute auto-off timer with deep sleep wake-up
• Debounced buttons for stable control

Goals & Learnings

This project served as a prototype and learning exercise in:

• Digital audio playback with ESP32 (I2S + SD)
• Memory and resource limits of microcontrollers
• Speaker and amplifier wiring