Project Hub /IoT & Connected Devices/Smart Energy / Water Metering/ESP32 Development Board Talking Clock

Intermediate

ESP32

₹500 – ₹1,500

3 – 6 Hours

Partial Kit

ESP32 Development Board Talking Clock

A custom talking clock built around an ESP32 microcontroller, featuring an MP3 shield for audio output and a precise DS3231 RTC module.

Originally published on ElectronicsForU

View original tutorial

Parts You'll Need

This project is sourced from another site, not written by us — this list is our best match of their components against what we stock, not a verified bill of materials. Always check the original blog (linked above) for the actual parts list before buying.

ESP32 WiFi+Bluetooth CP2102 Development Board Rs. 858.00
10pcs - 220 ohm 1/4 W Resistor Set Rs. 39.00
400 Points Mini Solderless Prototype PCB Breadboard High Quality Rs. 89.00
MB102 Adjustable Breadboard Power Supply Module (3.3V & 5V) for Arduino & Raspberry Pi Rs. 139.00
Jumper Wire 10 Pin Male To Male 20cm Rs. 45.00
Jumper Wire 10 Pin Male To Female 20cm Rs. 45.00

Selected: Rs. 0.00

This list includes a generic resistor set as a placeholder — it is not matched to the exact value or part number this circuit needs. The correct one is specified on the original source page linked above; check it before buying.

We don't carry yet: SD / MicroSD Card
RTC Module DS3231 / DS1307
TFT / Touch LCD
Speaker / Audio Amplifier

Browse all components

How It Works

The ESP32 Development Board Talking Clock operates as an integrated IoT and audio system governed by the ESP32 microcontroller. Timekeeping is managed by the DS3231 Real-Time Clock (RTC) module, which communicates accurate date and time data to the ESP32 over a standard serial communication bus, ensuring reliable time tracking even when disconnected from external networks. When an alarm is triggered or a time-announcement event occurs, the ESP32 orchestrates audio playback by commanding the MP3 Shield. The MP3 shield reads pre-rendered audio files stored on its micro SD card, decoding the digital audio data and driving an external speaker to produce audible speech. If the optional ILI9163 TFT display is integrated into the circuit, the ESP32 simultaneously updates the screen to provide a visual readout of the current time alongside the audio output. Software tools like Python, pyttsx, and gTTS are used externally to generate and process the spoken voice files in Audacity before they are loaded onto the micro SD card, allowing the microcontroller to simply trigger the appropriate pre-recorded audio tracks dynamically during operation.

Why Build This

Design and prototype accessible assistive technology devices tailored for the visually impaired using embedded microcontrollers.

Integrate multiple hardware peripherals—such as precision RTC modules, MP3 audio shields, and TFT displays—into a cohesive embedded system.

Gain practical experience in bridging off-line audio generation scripts (Python, gTTS) with real-time microcontroller hardware.

Real-World Application

Customizable talking alarms, accessibility aids for the visually impaired, and smart home notification clocks.

Skills You'll Learn

I2C communication

SPI communication

audio file management on micro SD cards

peripheral integration

embedded software architecture

display interfacing

Safety Precautions

No specific precautions noted for this build — always follow general electronics safety practices.

Technology Tags

ESP32

PYTHON

TEXT-TO-SPEECH

MP3 SHIELD

DS3231 RTC

AUDIO PROCESSING

MICROCONTROLLERS

Frequently Asked Questions

Why is an external MP3 shield used instead of the ESP32's internal DAC for audio?

While the ESP32 has basic audio capabilities, an MP3 shield with a micro SD card handles file decoding and audio amplification more reliably, ensuring clear speech output through the speaker.

Do I need to write Python code to run directly on the ESP32?

No, Python along with libraries like gTTS and pyttsx are typically used on your computer beforehand to generate and convert the voice audio files, while the ESP32 runs C/C++ firmware to control the hardware logic.

Is the TFT display strictly required for the clock to function?

No, the ILI9163 TFT display is listed as optional; the core talking clock functionality relies primarily on the ESP32, DS3231 RTC, and the MP3 shield.

Gallery

This page is part of Kitkraft's Project Hub — a curated collection of electronics & robotics projects gathered from the maker community to help students and hobbyists discover and learn to build. Kitkraft does not claim authorship of the original project, and makes no representation as to the accuracy, completeness or safety of third-party source material. The summary and "How It Works" explanation above are AI-generated, rewritten with reference to the original tutorial — not a reproduction of it. Full credit and a direct link to the original source are provided above. If you're the original creator and have a concern about how your work is represented here, please contact us and we'll address it promptly.

Kitkraft Project Hub — curated from the maker community, credited at the source.

PRJ-00267