ESP8266 NTP Clock with 16×2 I2C LCD Display

Features

• Displays real-time clock (12-hour format) with AM/PM indicator.
• Shows current date and weekday.
• Synchronizes time via NTP server.
• Uses I2C 16x2 LCD for display.
• Auto-updates time based on Indian Standard Time (IST, UTC+5:30).

Components Required

Component

Quantity

ESP8266 NodeMCU 1

16x2 I2C LCD 1

Jumper Wires As needed

Circuit Diagram

Connections

ESP8266 Pin LCD Pin

3.3V /5v VCC

GND GND

D2 (GPIO4) SDA

D1 (GPIO5)

SCL

Installation & Setup

1. Install Required Libraries

Make sure you have the following libraries installed in Arduino IDE:

• LiquidCrystal_I2C (Download)
• NTPClient (Download)
• ESP8266WiFi (Comes with ESP8266 board package)

2. Upload the Code

• Open the provided code in Arduino IDE.
• Replace your_SSID and your_PASSWORD with your WiFi credentials.
• Select ESP8266 NodeMCU as the board.
• Upload the code and open the Serial Monitor (115200 baud rate).

How the Code Works

• WiFi Connection: Connects ESP8266 to a WiFi network.
• NTP Synchronization: Fetches time from an NTP server (pool.ntp.org).
• Time Conversion: Converts 24-hour format to 12-hour format with AM/PM.
• Display Update: Updates the LCD every second with time, date, and weekday.

Clock Demo