BenLeikin

BenLeikin / PiTime

Public

Pi Based GPS time server

19
1
94% credibility
Found May 23, 2026 at 19 stars -- GitGems finds repos before they trend. Get early access to the next one.
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AI Analysis
Python
AI Summary

PiTime is a DIY project that transforms a $35 Raspberry Pi and a $15 GPS module into a professional-grade time server. The system connects to GPS satellites to get extremely accurate time signals, then shares that time with other computers on your network. It includes a beautiful web dashboard showing live satellite positions, real-time accuracy metrics, and historical performance data. The project achieves nanosecond-level precision—comparable to systems that cost thousands of dollars—and is designed for hobbyists who want to learn how GPS timing works at every level of the system.

How It Works

1
💡 You discover precision time

You learn that atomic-grade time accuracy exists and costs thousands of dollars—but you realize you can build the same thing for under $100.

2
📦 You gather the parts

You order a Raspberry Pi, a small GPS module, and grab an SD card. Everything costs about $90 total.

3
🔌 You connect the GPS module

You wire the GPS module to your Pi using simple pin connections. The module starts receiving satellite signals from space.

4
🛰️ Your Pi locks onto satellites

Your little computer starts talking to GPS satellites orbiting Earth, pulling down timing signals accurate to billionths of a second.

5
🌐 You open the dashboard

A beautiful web page shows you a live sky map of satellites, real-time accuracy measurements, and beautiful charts of how steady your time source is.

6
You share time with your network
💻
Local devices sync

Computers and devices in your home get super-accurate time from your Pi

🌍
Internet time with security

Remote devices connect securely with encrypted time requests

🏢
Local network sync

Other devices on your LAN get microsecond-accurate time for local operations

✅ You have a Stratum 1 time server

Your home-built system now provides the same quality time that banks and power grids use—and you built it yourself for a fraction of the cost.

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AI-Generated Review

What is PiTime?

PiTime turns a Raspberry Pi into a Stratum 1 NTP time server using a budget GPS module. Instead of relying on public internet time sources, it pulls timing data directly from GPS satellites via hardware PPS signals, achieving sub-microsecond accuracy. The project includes a live web dashboard showing satellite positions, PPS jitter graphs, and system telemetry. It runs chrony as the NTP daemon, supports PTP for LAN-wide precision timing, and includes NTS for cryptographically authenticated time synchronization. Total hardware cost comes in around $90.

Why is it gaining traction?

The hook is straightforward: commercial Stratum 1 servers start at $500, while this delivers comparable precision for a fraction of the price. Developers are drawn to the learning angle -- building your own time server forces you to understand GPS signaling, PPS discipline, and NTP internals at a systems level. The dashboard is a differentiator too; most chrony monitoring tools require Prometheus or lack satellite visualization entirely. The included conversion script makes it easy to point other LAN machines at your new time source with NTS support.

Who should use this?

Home lab operators wanting a local time reference without vendor lock-in will find this most useful. Network engineers evaluating GPS timing for infrastructure will appreciate the concrete performance numbers. Hobbyists interested in embedded systems or radio navigation get a practical project with real-world applications. This is less relevant for developers who just need "good enough" time sync and don't care about the underlying mechanics.

Verdict

PiTime delivers on its promises with clean documentation and a sensible architecture. The credibility score of 0.949999988079071% reflects the project's early stage and small community, so expect to debug independently when things go sideways. If you're comfortable with Linux networking and want to experiment with GPS-disciplined timing, this is a solid starting point. Just don't bet critical infrastructure on it without thorough testing first.

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