How to Use GT-U7 GPS Module: Examples, Pinouts, and Specs

The GT-U7 GPS Module, manufactured by Deegoo-FPV, is a compact and efficient device designed to provide accurate positioning and timing information using GPS signals. It features a built-in ceramic antenna and supports multiple satellite navigation systems, ensuring reliable performance in various environments. The module is easy to integrate into electronic projects, making it a popular choice for applications such as navigation, vehicle tracking, drones, robotics, and other location-based services.

• GPS navigation systems
• Vehicle and asset tracking
• Drones and UAVs
• Robotics and automation
• IoT devices requiring location data
• Time synchronization for embedded systems

Below are the key technical details of the GT-U7 GPS Module:

The GT-U7 GPS Module has a 4-pin interface for easy connection to microcontrollers and other devices. Below is the pinout:

1. Power Supply: Connect the VCC pin to a 3.3V or 5.0V power source and the GND pin to ground.
2. UART Communication:
   • Connect the TXD pin of the module to the RX pin of your microcontroller (e.g., Arduino UNO).
   • Connect the RXD pin of the module to the TX pin of your microcontroller.
3. Antenna Placement: Ensure the module's built-in antenna has a clear view of the sky for optimal GPS signal reception.

Below is an example of how to use the GT-U7 GPS Module with an Arduino UNO to read GPS data:

• Connect VCC to the Arduino's 5V pin.
• Connect GND to the Arduino's GND pin.
• Connect TXD to the Arduino's RX pin (pin 0).
• Connect RXD to the Arduino's TX pin (pin 1).

#include <SoftwareSerial.h>

// Create a SoftwareSerial object for communication with the GT-U7 GPS Module
SoftwareSerial gpsSerial(4, 3); // RX = pin 4, TX = pin 3

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

  Serial.println("GT-U7 GPS Module Test");
  Serial.println("Waiting for GPS data...");
}

void loop() {
  // Check if data is available from the GPS module
  while (gpsSerial.available()) {
    char c = gpsSerial.read(); // Read one character from the GPS module
    Serial.print(c); // Print the character to the Serial Monitor

    // Note: The GPS module outputs NMEA sentences, which can be parsed
    // for specific data like latitude, longitude, and time.
  }
}

• Baud Rate: The default baud rate of the GT-U7 is 9600 bps. Ensure your microcontroller's UART settings match this.
• Signal Reception: For best results, place the module outdoors or near a window with a clear view of the sky.
• Power Supply: Use a stable power source to avoid performance issues.

1. No GPS Data Received:

   • Ensure the module has a clear view of the sky.
   • Verify the connections between the module and the microcontroller.
   • Check that the baud rate is set correctly (default: 9600 bps).

2. Long Time to Acquire GPS Fix:

   • This may occur during a cold start. Allow the module sufficient time to acquire satellite signals.
   • Ensure the module is not obstructed by buildings, trees, or other objects.

3. Garbage Data in Serial Monitor:

   • Verify that the baud rate in the Serial Monitor matches the baud rate of the GPS module.
   • Check for loose or incorrect wiring.

4. Module Not Powering On:

   • Confirm that the power supply voltage is within the specified range (3.3V to 5.0V).
   • Check the connections to the VCC and GND pins.

Q1: Can the GT-U7 GPS Module be used indoors?
A1: While the module may work indoors, signal reception is significantly reduced. For best results, use the module outdoors or near a window.

Q2: How do I parse NMEA sentences from the module?
A2: NMEA sentences can be parsed using libraries like TinyGPS++ or by writing custom code to extract specific data fields.

Q3: Can I change the default baud rate of the module?
A3: Yes, the baud rate can be changed using specific UBX commands. Refer to the module's datasheet for details.

Q4: Does the module support other satellite systems like GLONASS?
A4: The GT-U7 primarily supports GPS signals. For multi-system support, check the module's datasheet or consider alternative models.

By following this documentation, you can effectively integrate the GT-U7 GPS Module into your projects and troubleshoot common issues.