ESP32 NTP Digital Clock with Timezone and Daylight Saving Time

ESP32 NTP digital clock synchronizes with NTP servers. Handles timezone configuration and automatically adjusts for Daylight Saving Time (DST). Time displayed on TFT screen or OLED as HH:MM:SS with date. POSIX timezone string handles DST rules for all regions. For India: 'IST-5:30' (no DST). For USA Eastern: 'EST5EDT, M3.2.0, M11.1.0'. The configTimeWithTZ() function applies timezone with DST. Time accuracy: syncs every 24 hours to NTP. Display shows day of week, week number, and countdown to next DST change. WiFiManager library handles WiFi credentials via captive portal - just connect to ESP32-NTP AP and enter WiFi details. Settings stored in SPIFFS. Libraries: WiFi, NTPClient or configTime, WiFiManager, TFT_eSPI, Preferences.

Detailed Project Description

ESP32 NTP Digital Clock with Timezone and Daylight Saving Time focuses on a specific hardware interface or peripheral and shows exactly how to wire it, drive it from firmware and verify it is working.

How It Works
1. The peripheral is connected to the controller using the required bus (SPI/I2C/UART/I2S/CAN/RS-485/PWM/ADC).
2. The driver library is initialised and the peripheral configured.
3. Firmware exchanges data with the peripheral and processes it (measure, decode, render, play).
4. Results are verified on a display, serial monitor or the receiving device.

Key Components and Their Role
- ESP32: dual-core Wi-Fi + Bluetooth microcontroller that runs the firmware, reads the sensors and hosts the network connection.
- OLED display (SSD1306): 128x64 I2C display used to show live readings and status.
- TFT display: colour graphical display (SPI) used for the on-device user interface.

Implementation Steps
1. Collect the components and study each module's datasheet (pin-out, voltage, interface).
2. Wire the circuit on a breadboard following the pin mapping; power sensors from the correct rail (3.3 V / 5 V).
3. Install Arduino IDE, NTPClient Library, WiFiManager Library and the required libraries; flash a minimal test sketch for each module separately.
4. Write the main firmware: read sensors → process → drive outputs / send data.
5. Configure network or cloud credentials and test communication end-to-end.
6. Calibrate thresholds, add error handling (reconnect, sensor time-out) and run a long-duration test.
7. Finalise on a PCB / enclosure and document wiring, code and results.

Key Features
- Correct wiring and bus configuration
- Driver setup
- Data processing
- Verification on real hardware

Expected Output
On completion the student will have a working peripheral that is measured/driven exactly as intended.

Deliverables
- Complete source code with comments
- Circuit diagram and pin mapping
- Project report with screenshots and results
- Demonstration-ready build