GPS-Disciplined Stratum-1 NTP Server with W5500 Hardware Timestamping
High-precision NTP server on ESP32 + W5500 using GPS PPS discipline, MCPWM hardware capture, and ARP-aware transmit timing
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Components
Hardware components
WIZnet - W5500
x 1
Espressif - ESP32
x 1
Generic - LED Matrix 32x8 MAX7219
x 1
Project description
A Stratum-1 Time Server on Your Desk Most ESP32-based NTP projects are NTP clients — they pull time from the internet. This project flips that: it turns an ESP32 into an NTP server, providing Stratum-1 time to every device on the local network. The time source is a GPS receiver with PPS (Pulse Per Second) output, disciplined through a sophisticated PI servo loop with hardware-assisted timestamping. What sets this project apart from typical GPS-NTP implementations is the depth of its timing pipeline. On the W5500 Ethernet path, the firmware primes the ARP cache before stamping the transmit…
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