How to Build an ESP32-C3 Text-to-Speech Using Wit.ai

This system operates by bridging cloud-based speech synthesis with physical microcontroller hardware to generate spoken audio output from text strings. At the core of the project is the ESP32-C3 Dev Module, which connects to a local Wi-Fi network to send text data to the Wit.ai API. The Wit.ai cloud service processes this text and returns a synthesized audio stream, typically in an encoded digital format. Once the ESP32-C3 receives the audio data, it utilizes its internal processing capabilities to decode the stream and transmit the digital audio signals using an I2S (Inter-IC Sound) protocol interface. The MAX98357A Digital Audio Amplifier Module receives this digital I2S audio stream directly from the microcontroller. Because the MAX98357A features an integrated digital-to-analog converter (DAC) and a Class-D power amplifier, it efficiently converts the incoming digital audio data into an amplified analog signal capable of driving a small speaker. Finally, the connected 4-ohm or 8-ohm speaker translates these electrical audio waveforms into audible sound waves, completing the loop from typed text to spoken word.