How to Use GNSS//2: Examples, Pinouts, and Specs

The GNSS//2, manufactured by Uno (Part ID: Uno), is a high-performance Global Navigation Satellite System (GNSS) receiver. It is designed to provide accurate positioning and timing information by receiving signals from multiple satellite constellations, such as GPS, GLONASS, Galileo, and BeiDou. This compact and versatile module is ideal for applications requiring precise location tracking and synchronization.

• Vehicle navigation systems
• Asset tracking and fleet management
• Precision agriculture
• Timing synchronization for communication networks
• Outdoor sports and fitness devices
• IoT devices requiring geolocation capabilities

The GNSS//2 module is engineered for reliability and precision. Below are its key technical specifications:

The GNSS//2 module has a simple pinout for easy integration into your projects. Below is the pin configuration:

1. Power Supply: Connect the VCC pin to a 3.3V or 5.0V power source and the GND pin to ground.
2. Communication Interface:
   • For UART communication, connect the TX pin of the GNSS//2 to the RX pin of your microcontroller and the RX pin of the GNSS//2 to the TX pin of your microcontroller.
   • For I2C communication, connect the SDA and SCL pins to the corresponding I2C lines of your microcontroller.
3. Enable the Module: Ensure the EN pin is connected to VCC to activate the module.
4. Antenna Connection: Attach an external GNSS antenna to the module's antenna port for optimal signal reception.
5. Data Parsing: Use a microcontroller or computer to read and parse the NMEA sentences output by the module.

• Antenna Placement: Place the GNSS antenna in an open area with a clear view of the sky for the best signal reception.
• Power Supply: Use a stable power source to avoid fluctuations that could affect performance.
• UART Configuration: Ensure the baud rate of your microcontroller matches the GNSS//2's default baud rate (9600 bps) or configure it as needed.
• PPS Signal: Use the PPS pin for applications requiring precise timing synchronization.

Below is an example of how to interface the GNSS//2 module with an Arduino UNO using UART communication:

• GNSS//2 VCC → Arduino 5V
• GNSS//2 GND → Arduino GND
• GNSS//2 TX → Arduino RX (Pin 0)
• GNSS//2 RX → Arduino TX (Pin 1)

#include <SoftwareSerial.h>

// Define RX and TX pins for SoftwareSerial
SoftwareSerial GNSS(10, 11); // RX = Pin 10, TX = Pin 11

void setup() {
  Serial.begin(9600); // Initialize Serial Monitor at 9600 bps
  GNSS.begin(9600);   // Initialize GNSS module at 9600 bps

  Serial.println("GNSS//2 Module Initialized");
}

void loop() {
  // Check if data is available from the GNSS module
  if (GNSS.available()) {
    // Read data from GNSS module and send it to Serial Monitor
    while (GNSS.available()) {
      char c = GNSS.read();
      Serial.print(c);
    }
  }
}

1. No Data Output from the Module

   • Cause: Incorrect wiring or baud rate mismatch.
   • Solution: Double-check the connections and ensure the baud rate is set to 9600 bps.

2. Poor Signal Reception

   • Cause: Antenna placement or obstructions.
   • Solution: Place the antenna in an open area with a clear view of the sky.

3. Module Not Powering On

   • Cause: Insufficient or unstable power supply.
   • Solution: Verify the power source and ensure the EN pin is connected to VCC.

4. PPS Signal Not Detected

   • Cause: PPS pin not connected or module not locked onto satellites.
   • Solution: Ensure the module has a satellite fix and the PPS pin is properly connected.

• Q: Can the GNSS//2 work indoors?

  • A: The GNSS//2 is designed for outdoor use. While it may work indoors near windows, performance will be significantly reduced.

• Q: How do I change the baud rate of the GNSS//2?

  • A: Refer to the manufacturer's configuration guide to send the appropriate command via UART.

• Q: What is the purpose of the PPS pin?

  • A: The PPS pin provides a precise timing pulse, useful for synchronization in time-sensitive applications.

• Q: Can I use the GNSS//2 with a 3.3V microcontroller?

  • A: Yes, the GNSS//2 supports both 3.3V and 5.0V logic levels.