Turn Text into Speech with ESP32 - Step-by-Step Guide

This intermediate text-to-speech system operates by leveraging the processing power of the ESP32 microcontroller to handle digital audio data streams and transmit them through an I2S communication protocol. The ESP32 acts as the central master device, running code written in the Arduino IDE supported by libraries such as Audio.h, Audio.cpp, DAC.h, and DAC.cpp. Power is supplied reliably to the entire circuit via a 5V USB power supply cable, ensuring stable operation for both the microcontroller and the output stage. As the ESP32 processes textual or audio stream data, it outputs digital audio signals via its I2S interface directly to the MAX98357A I2S 3-watt Class D amplifier. The MAX98357A takes this digital audio input, efficiently converts it, and amplifies the signal to drive a physical 3-watt speaker. Because Class D amplifiers use pulse-width modulation techniques to switch power transistors rapidly, the system delivers high efficiency audio output without generating excessive heat. The resulting acoustic soundwaves allow the device to successfully convert processed text data into audible speech in real time.