ESP32 Text-to-Speech (TTS) System
An ESP32-based Text-to-Speech system that converts text into human-like speech using online or offline TTS engines for smart assistants, alert systems, and accessibility projects.
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₹1940.00
Inclusive of all taxes
Components
5 items
Difficulty
Intermediate
Build Time
2-3 hours
Project Details
How It Works
How It WorksThe ESP32 receives text input via Serial Monitor, Web Interface, Mobile App, or MQTT/Cloud. The text is sent to a TTS engine (online like Google TTS or offline module). The TTS engine returns or generates audio data. The ESP32 then streams this audio data via the I2S protocol to the MAX98357A DAC/amplifier, which converts the digital signal to analog and amplifies it. Finally, the speaker outputs the spoken text. The system uses Wi-Fi for online TTS services and can be configured for multiple languages.
Prerequisites
Basic knowledge of Arduino programming, understanding of ESP32 fundamentals, familiarity with HTTP requests and APIs, and basic electronics concepts for wiring components. Users should have an ESP32 development board and access to a Wi-Fi network for online TTS functionality.
What You'll Learn
What You'll LearnUnderstanding how text is converted to speech
Learning to stream digital audio data via I2S protocol
Making HTTP requests to external services and processing responses
Handling audio data on a microcontroller for playback
Key Features
Produces human-like speech using online TTS engines
Supports English, Hindi, Marathi, Spanish, French, German
Connects to internet for online TTS services
Can be integrated with various input methods and use cases
What's Included in the Kit
| Component | Qty | Price |
|---|---|---|
 | 1 | ₹0.00 |
I2S DAC / Audio Amplifier (MAX98357A) | 1 | ₹0.00 |
 | 1 | ₹0.00 |
 | 1 | ₹0.00 |
 | 1 | ₹171.00 |
Operating Instructions
Pin Connections
Pin Connections| MCU Pin | Connected To | Purpose | Notes |
|---|---|---|---|
| GPIO 25 | MAX98357A DIN | Data input for I2S audio | Serial data line |
| GPIO 26 | MAX98357A BCLK | Bit clock for I2S audio | Bit clock line |
| GPIO 27 | MAX98357A LRC | Left/right clock for I2S audio | Word select line |
| 5V | MAX98357A VIN | Power supply for DAC/amplifier | Ensure power supply can handle current |
| GND | MAX98357A GND | Common ground connection | Essential for proper signal reference |
Tools Required
Tools RequiredSafety Precautions
Electrical
- ⚠Use proper power supply to avoid damaging components
- ⚠Ensure correct voltage levels for ESP32 and amplifier
Operating
- ⚠Avoid high volume levels to protect hearing and speaker
- ⚠Secure API keys to prevent unauthorized usage
General
- ⚠Handle components with care to avoid static damage
Frequently Asked Questions
Frequently Asked QuestionsQ:Can ESP32 do offline TTS?
Q:Can text come from sensors?
Q:Is Google TTS free?
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