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

The GT-U7 is a GPS module manufactured by Goouuu Tech, designed to provide accurate location and time data. It is equipped with a high-sensitivity GPS receiver, making it suitable for a wide range of applications. The module is compact, lightweight, and easy to integrate with microcontrollers, making it a popular choice for navigation systems, robotics, and tracking devices. Its compatibility with UART communication ensures seamless integration with platforms like Arduino, Raspberry Pi, and other microcontroller-based systems.

• Navigation systems for vehicles and drones
• Robotics requiring precise location data
• Asset and personal tracking devices
• Time synchronization for IoT systems
• Geographic data logging

The GT-U7 GPS module is designed to deliver reliable performance with the following key specifications:

The GT-U7 module has a simple pinout for easy integration. Below is the pin configuration:

To use the GT-U7 GPS module, follow these steps:

1. Power the Module: Connect the VCC pin to a 3.3V or 5.0V power source and the GND pin to ground.
2. Establish UART Communication: Connect the TXD pin of the GT-U7 to the RX pin of your microcontroller, and the RXD pin of the GT-U7 to the TX pin of your microcontroller.
3. Antenna Placement: Attach the included active antenna to the module and ensure it has a clear view of the sky for optimal GPS signal reception.
4. Configure Baud Rate: The default baud rate is 9600 bps. Ensure your microcontroller's UART settings match this value.

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

#include <SoftwareSerial.h>

// Define RX and TX pins for SoftwareSerial
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 at 9600 bps
  Serial.println("GT-U7 GPS Module Test");
}

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

• Antenna Placement: Place the antenna in an open area with minimal obstructions for better signal reception.
• Power Supply: Use a stable power source to avoid fluctuations that may affect GPS performance.
• UART Settings: Ensure the baud rate and UART settings match between the GT-U7 and your microcontroller.
• Signal Acquisition: Allow the module a few seconds to acquire satellite signals, especially during a cold start.

1. No GPS Data Output

   • 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 is obstructed or placed indoors.
   • Solution: Move the antenna to an open area with a clear view of the sky.

3. Module Not Powering On

   • Cause: Insufficient power supply.
   • Solution: Verify that the VCC pin is receiving 3.3V to 5.0V and the GND pin is properly connected.

4. Data Appears as Gibberish

   • Cause: Baud rate mismatch between the module and microcontroller.
   • Solution: Ensure both devices are set to the same baud rate (default: 9600 bps).

Q: Can the GT-U7 work indoors?
A: While the GT-U7 can function indoors, signal reception may be weak or unavailable. For best results, use the module outdoors with a clear view of the sky.

Q: How many satellites does the GT-U7 need for accurate positioning?
A: The GT-U7 requires a minimum of 4 satellites for accurate 3D positioning.

Q: Can I change the default baud rate?
A: Yes, the baud rate can be changed using specific configuration commands sent to the module. Refer to the U-Blox NEO-7 documentation for details.

Q: What is the purpose of the PPS pin?
A: The PPS (Pulse Per Second) pin provides a precise timing signal that can be used for synchronization in time-sensitive applications.

By following this documentation, you can effectively integrate and utilize the GT-U7 GPS module in your projects.