Designed and manufactured in Boulder, Colorado, USA, the SparkPNT GNSS Disciplined Oscillator (GNSSDO) and GNSS Disciplined Oscillator Plus (GNSSDO+) are the perfect solution for your high-precision timing needs. Based around the multi-constellation, multi-frequency, L5-ready mosaic-T from Septentrio, these are our most accurate GNSS timing products to date. They feature a disciplined 10MHz oscillator: Digitally-Controlled Temperature-Controlled Crystal Oscillator (DCTCXO) on the GNSSDO; Digitally-Controlled Double-Oven Crystal Oscillator (OCXO) on the GNSSDO+. The mosaic-T also has built-in on-module support for the Fugro AtomiChron L-band timing service.
Under the hood, the GNSSDO and GNSDO+ are based on the mosaic-T GNSS module from Septentrio, plus the Espressif ESP32-WROVER processor (16MB flash, 8MB PSRAM). The mosaic-T has USB-C connectivity (with Ethernet-over-USB), multiple UARTs and supports full Ethernet connectivity. You can connect the mosaic-T directly to your Ethernet network - our product supports Power-over-Ethernet too. The ESP32 rides shotgun: disciplining the digitally-controlled oscillator and controlling the OLED display. Remote configuration is possible, the ESP32 console can be accessed via TCP. The GNSSDO and GNSSDO+ have multiple power options including USB-C, PoE and 9V-36V DC, making it easy to connect them to a battery-backed supply.
The mosaic-T is a superb GNSS module designed for highly accurate timing applications. But it does not support RTK. It can not be used as a RTK Rover or Base. RTCM output is not supported.
- Product Manual - Product manual for the GNSSDO hosted by GitHub pages.
Need to download or print our hookup guide?
The /Firmware/Binaries folder contains the firmware binaries.
You can update or reload the firmware using the SparkFun RTK Firmware Uploader.
- /docs - Online documentation files
- assets - Assets files
- board_files - Files for the product design
- GNSSDO Schematic (.pdf)
- GNSSDO+ Schematic (.pdf)
- Dimensions (.png)
- GNSSDO KiCad files (.zip)
- GNSSDO+ KiCad files (.zip)
- img/hookup_guide/ - Images for hookup guide documentation
- board_files - Files for the product design
- assets - Assets files
- /Hardware - KiCad design files
- /Hardware/Production - PCB panel production files
- /Front_Sticker - DXF and PDF files for the front sticker
- /Rear_Sticker - DXF and PDF files for the rear sticker
- /Firmware - Arduino source code and binaries for the firmware which runs on the ESP32-WROVER
- /Test_Sketches - Additional code used to validate and test the GNSSDO
- /Documents - Component datasheets etc.
- v10 - Initial Release
This product is open source!
Please review the LICENSE.md file for license information.
If you have any questions or concerns about licensing, please contact technical support on our SparkFun forums.
Distributed as-is; no warranty is given.
- Your friends at SparkPNT.