How to Use SparkFun Qwiic GPS-RTK2 - ublox ZED-F9P: Examples, Pinouts, and Specs

The SparkFun Qwiic GPS-RTK2 is a cutting-edge Global Navigation Satellite System (GNSS) module that offers high-precision, dual-band RTK capabilities. It is built around the ublox ZED-F9P chipset, which is renowned for its accurate positioning and timing solutions. This module is designed for applications requiring centimeter-level accuracy such as autonomous vehicles, drones, precision agriculture, and surveying.

• Autonomous navigation for drones and ground vehicles
• Precision agriculture for accurate field mapping and machinery guidance
• Surveying and mapping for construction and land management
• Time synchronization for critical infrastructure

• Receiver Type: 184-channel u-blox F9 engine, GNSS quad-band receiver
• Position Accuracy: Down to 1 cm with RTK
• Update Rate: Up to 20 Hz
• Operating Temperature: -40°C to 85°C
• Communication Interface: UART, SPI, I2C (Qwiic)
• Input Voltage: 3.3V to 5.5V
• Power Consumption: 68mA to 130mA

1. Powering the Module: Connect the 3.3V and GND pins to a stable power supply within the specified voltage range.
2. Data Communication: Choose the communication interface (UART, SPI, or I2C) that best fits your application. For I2C, use the Qwiic connector for easy interfacing.
3. Antenna Connection: Attach a GNSS antenna to the module to receive satellite signals.
4. Configuration: Use the u-center software from u-blox to configure the module settings as per your requirements.

• Ensure that the antenna has a clear view of the sky for optimal satellite signal reception.
• Avoid placing the module near sources of electromagnetic interference.
• Use proper ESD precautions when handling the module to prevent damage.
• For battery-powered applications, consider the power consumption and optimize the update rate accordingly.

#include <Wire.h>
#include <SparkFun_u-blox_GNSS_Arduino_Library.h>

SFE_UBLOX_GNSS myGNSS;

void setup() {
  Wire.begin();
  Serial.begin(115200);
  while (!Serial); // Wait for serial port to connect

  if (myGNSS.begin() == false) {
    Serial.println(F("u-blox GNSS not detected at default I2C address. Please check wiring."));
    while (1);
  }
}

void loop() {
  if (myGNSS.getGnssFixOk()) {
    double latitude = myGNSS.getLatitude();
    double longitude = myGNSS.getLongitude();
    double altitude = myGNSS.getAltitude();

    Serial.print(F("Latitude: "));
    Serial.print(latitude, 8);
    Serial.print(F(" Longitude: "));
    Serial.print(longitude, 8);
    Serial.print(F(" Altitude: "));
    Serial.print(altitude);
    Serial.println(F("m"));
  }
  delay(1000);
}

This example initializes the GNSS module and prints the latitude, longitude, and altitude to the serial monitor once a second.

• No Fix: Ensure the antenna is properly connected and has a clear view of the sky.
• Inaccurate Readings: Check that the module is configured for the correct GNSS constellations and modes.
• Communication Failure: Verify that the wiring matches the chosen communication protocol and that there are no loose connections.

• Power Cycle: If the module is unresponsive, try power cycling it.
• Factory Reset: Perform a factory reset using the u-center software if configuration issues persist.
• Firmware Update: Ensure the module's firmware is up to date for optimal performance.

Q: Can the module be used without an external antenna? A: No, an external GNSS antenna is required for the module to function correctly.

Q: What is the maximum update rate? A: The module can provide position updates at up to 20 Hz, depending on the configuration.

Q: Is the module compatible with all GNSS constellations? A: Yes, the ZED-F9P supports multiple constellations including GPS, GLONASS, Galileo, and BeiDou.

Q: How do I connect the module to my microcontroller? A: You can connect via UART, SPI, or I2C. For Arduino boards, I2C with the Qwiic system is the simplest method.

For further assistance, please refer to the SparkFun Qwiic GPS-RTK2 datasheet and the u-blox ZED-F9P integration manual.