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The Laureline GPS NTP Server is a small, high-performance, and low-power device that serves time to network clients from a built-in GPS receiver. Given only a GPS antenna, a power source, and a clear view of the sky it can track UTC to within 200 nanoseconds and make precise time available to your entire LAN, WAN, or to the Internet. Laureline interoperates seamlessly with any NTP or SNTP client and can sustain thousands of queries per second. Even under high throughput timekeeping operations are never disrupted or perturbed.
Laureline is Open Source Hardware and Open Source Software. Hardware design files and user documentation are provided under the Creative Commons Attribution 3.0 License. Software source code is provided under the MIT license.
Laureline is open-source hardware, provided under the Creative Commons Attribution 3.0 license. It was developed using Altium Designer but a PDF of the schematic as well as the Gerber and NC Drill outputs is provided below. The current hardware revision number is 7.
All parts and materials are RoHS-compatible and only lead-free solder is used.
The Laureline software is also open-source and is provided under the MIT License. Laureline includes and links against CoOS (BSD license), lwIP, (BSD license), ChaN's FatFs (permissively licensed), and NTPns(Beer-ware license). The software can be inspected, modified, compiled and uploaded to the burned-in bootloader using nothing more than the GCC ARM Embedded toolchain, standard build tools (GNU Make, etc.), and a Micro-SD card.
The onboard GPS receiver is currently a NEO-6M made by u-blox. This is a navigation receiver, not the NEO-6T timing receiver, but it is more than accurate enough for NTP purposes. Even the NEO-6M has quantization error corrections, so from a practical standpoint the only missing feature is position hold. The primary reason NEO-6M is used is that it is not only cheaper but very easy to purchase, whereas NEO-6T is a specialty part that can only be readily purchased as a very expensive sample or an extraordinarily expensive full reel of parts. If you wish to use a timing-grade receiver, you connect one on the provided external header. u-blox, Trimble, and Motorola protocols are supported so you can even connect it to your Thunderbolt with appropriate logic level conversion, and 5V and 3.3V power is supplied.
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Tools and widgets for time nuts and tinkerers. Made with love in the USA.