1. Product Overview
The SparkFun GPS-RTK2 Board, featuring the u-blox ZED-F9P module, is a high-precision Global Positioning System (GPS) breakout board designed for Real-Time Kinematic (RTK) applications. This board offers centimeter-level accuracy for positioning and navigation, suitable for various projects requiring precise location data. It supports both rover and base station operations.
Key Features:
- Dual Operations: Capable of 10mm, three-dimensional accuracy for both rover and base station operations.
- Multiple Configuration Options: Supports geofencing, variable I2C addresses, and adjustable update rates, including up to 20Hz for high-precision RTK solutions.
- Five Simultaneous Communication Ports: Includes USB-C (enumerates as a COM port), UART1 (3.3V TTL), UART2 for RTCM reception (3.3V TTL), I2C (via Qwiic connectors or broken out pins), and SPI.
- Arduino Library Compatibility: Facilitates reading latitude, longitude, heading, and speed over I2C without constant serial polling.
- Fast Time to First Fix: Achieves a cold start in 25 seconds and a hot start in 2 seconds.
2. Getting Started: Setup
2.1 Package Contents
The SparkFun GPS-RTK2 Board package includes:
- SparkFun GPS-RTK2 Board (ZED-F9P)
- Rechargeable backup battery (pre-installed)
Note: Cables, external antennas, and microcontrollers are not included and must be acquired separately.
2.2 Hardware Connections
To begin using your GPS-RTK2 board, connect the necessary components:
- Antenna Connection: Connect a compatible L1/L2 GNSS antenna to the u.FL connector on the board. Ensure the connection is secure.
- Power and Data (USB-C): Connect the board to a computer or power source using a USB-C cable. The USB-C port provides power and allows communication with the board, enumerating as a COM port.
- Qwiic Connection (Optional): For easy I2C communication, use a Qwiic cable to connect the board to a Qwiic-enabled microcontroller or host device.
- Other Interfaces (Optional): Utilize the broken-out pins for UART, SPI, or additional I2C connections as required by your application.
2.3 Powering the Board
The board can be powered via the USB-C port or through the 3.3V or 5V pins. Ensure your power supply provides stable voltage within the specified operating range. The onboard rechargeable backup battery helps maintain satellite data for faster warm starts.
3. Operating Instructions
3.1 Basic Operation
The ZED-F9P module can operate as both a rover and a base station. For RTK functionality, a base station is required to provide correction data to the rover. The module automatically detects and utilizes available satellite signals (L1 and L2 bands) to achieve high-precision positioning.
3.2 Communication Interfaces
The board offers multiple communication options:
- USB-C: Primary interface for configuration and data output. Connects to a computer and appears as a virtual COM port.
- UART1 (3.3V TTL): General-purpose serial communication for NMEA or UBX protocol data.
- UART2 (3.3V TTL): Dedicated for receiving RTCM correction data from a base station.
- I2C (Qwiic): Simplifies connection to Qwiic-enabled devices for data retrieval.
- SPI: High-speed serial interface for advanced applications.
3.3 Arduino Library Integration
SparkFun provides an Arduino library for easy integration with microcontrollers. This library allows you to read essential GPS data such as latitude, longitude, heading, and speed over the I2C interface, reducing the need for constant serial polling and simplifying code development.
3.4 Configuration Options
The ZED-F9P module offers extensive configuration options via u-center software or through commands sent over its communication interfaces. These options include:
- Geofencing: Define virtual boundaries for location-based alerts or actions.
- Variable I2C Address: Adjust the I2C address to avoid conflicts with other devices on the bus.
- Update Rates: Configure the frequency at which position data is output, up to 20Hz for RTK.
- Message Configuration: Enable or disable specific NMEA or UBX messages.
4. Maintenance
The SparkFun GPS-RTK2 Board is designed for durability, but proper care ensures longevity and optimal performance:
- Environmental Protection: Avoid exposing the board to extreme temperatures, moisture, or corrosive environments.
- Physical Handling: Handle the board by its edges to prevent damage to components or static discharge.
- Backup Battery: The onboard rechargeable backup battery helps maintain satellite data for faster warm starts. No user maintenance is typically required for this component.
- Cleaning: If necessary, gently clean the board with a soft, dry brush or compressed air. Avoid liquids.
5. Troubleshooting
If you encounter issues with your SparkFun GPS-RTK2 Board, consider the following:
- No Fix/Poor Accuracy:
- Ensure the antenna is properly connected and has a clear view of the sky.
- Verify that the antenna is an L1/L2 compatible GNSS antenna.
- Check for obstructions that might block satellite signals.
- For RTK, confirm the base station is operational and transmitting RTCM correction data, and the rover is receiving it.
- Communication Issues:
- USB-C: Ensure correct drivers are installed on your computer. Verify the COM port is recognized.
- UART/I2C/SPI: Double-check wiring connections, baud rates, and I2C addresses. Ensure your microcontroller code is correctly configured for the chosen interface.
- Power Problems:
- Confirm the power supply is providing the correct voltage (3.3V or 5V) and sufficient current.
- Check for any short circuits or incorrect wiring.
- Slow Time to First Fix (TTFF):
- A cold start (first power-up or after long periods without power) can take up to 25 seconds. Subsequent hot starts should be faster (around 2 seconds) due to the backup battery.
- Ensure the backup battery is charged (it charges when the main power is applied).
6. Specifications
| Feature | Specification |
|---|---|
| Brand | SparkFun |
| Model Name | GPS-RTK2 |
| Item Model Number | 15136 |
| Product Dimensions (LxWxH) | 1.77 x 1.77 x 0.51 inches |
| Item Weight | 0.32 ounces |
| Connectivity Technology | USB |
| Wireless Type | Bluetooth (Note: This refers to the module's capability, not necessarily an active Bluetooth interface on the breakout board itself without additional components) |
| Processor Brand | Atmel (likely referring to a supporting microcontroller, not the ZED-F9P itself) |
| Number of Processors | 1 |
| Batteries | 1 Lithium Metal battery required (included, for backup) |
| Included Components | Rechargeable backup battery |
7. Warranty and Support
For warranty information and technical support, please refer to the official SparkFun Electronics website or contact their customer service directly. Product documentation, tutorials, and community forums are also available on the SparkFun website to assist with setup and advanced usage.
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