Arduino W5500 NTP Client — Get Accurate Time via UDP
Build an Arduino NTP client using the WIZnet W5500 Ethernet Shield to query pool.ntp.org over UDP and display network time.
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Components
Hardware components
Arduino - Arduino Mega 2560
x 1
Arduino - Arduino Ethernet Shield 2
x 1
Monoprice - RJ45 Ethernet Cable
x 1
Arduino - Arduino IDE
x 1
Project description
Introduction This project implements a classic Network Time Protocol (NTP) client on Arduino using the WIZnet W5500 Ethernet Shield. By sending a 48‑byte UDP request to an NTP server (e.g., pool.ntp.org) and parsing the response, the sketch retrieves the current Unix time, converts it to human‑readable format, and prints it to the Serial Monitor (or an optional LCD). WIZnet Product Integration The W5500 offloads TCP/IP, providing a reliable wired connection with minimal MCU overhead. The shield interfaces via SPI (ICSP header) and exposes RJ45 with link/activity LEDs. Using EthernetUDP, the…
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