How to Use ATGM336H: Examples, Pinouts, and Specs

The ATGM336H is a high-performance GPS module designed to deliver precise positioning data. It integrates a built-in antenna, ensuring ease of use and compact design. With its low power consumption and support for multiple communication interfaces, the ATGM336H is ideal for a wide range of applications, including robotics, automotive systems, and IoT devices. Its robust performance and versatility make it a popular choice for developers and engineers seeking reliable GPS solutions.

• Robotics navigation and localization
• Automotive GPS systems
• IoT devices requiring geolocation
• Asset tracking and fleet management
• Outdoor and wearable devices

1. Power Supply: Connect the VCC pin to a regulated 3.3V power source and the GND pin to the ground.
2. Communication Interface:
   • For UART communication, connect the TXD and RXD pins to the corresponding UART pins on your microcontroller.
   • For I2C communication, connect the SDA and SCL pins to the I2C bus of your microcontroller.
3. Antenna: The ATGM336H has a built-in antenna, so no external antenna is required for most applications.
4. PPS Signal: If precise timing is required, connect the PPS pin to your microcontroller to receive the 1Hz timing pulse.
5. Reset: Optionally, connect the RESET pin to a GPIO pin on your microcontroller for manual or software-controlled resets.

• Ensure the power supply is stable and within the specified voltage range (3.0V to 3.6V).
• Place the module in an open area with minimal obstructions for optimal GPS signal reception.
• Avoid placing the module near high-frequency noise sources or metal enclosures that may interfere with GPS signals.
• Configure the communication interface (UART or I2C) based on your application requirements.

Below is an example of how to connect the ATGM336H to an Arduino UNO using the UART interface:

#include <SoftwareSerial.h>

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

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

  Serial.println("ATGM336H GPS Module Test");
}

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

• The default baud rate for the ATGM336H is 9600. Ensure your microcontroller's UART settings match this.
• Use a level shifter if your microcontroller operates at 5V logic levels, as the ATGM336H operates at 3.3V.

1. No GPS Fix:

   • Ensure the module is placed in an open area with a clear view of the sky.
   • Wait for the module to acquire satellite signals, which may take up to 35 seconds for a cold start.

2. No Data Output:

   • Verify the connections between the module and the microcontroller.
   • Check that the baud rate of the microcontroller matches the module's default baud rate (9600).
   • Ensure the module is powered correctly and the voltage is within the specified range.

3. Intermittent Signal Loss:

   • Avoid placing the module near sources of electromagnetic interference (e.g., motors, Wi-Fi routers).
   • Ensure the module is not enclosed in a metal case, which can block GPS signals.

4. Module Not Responding to Commands:

   • Confirm that the RXD and TXD pins are correctly connected.
   • Check if the RESET pin is unintentionally held low, which would keep the module in reset mode.

Q: Can the ATGM336H be used indoors?
A: While the ATGM336H can function indoors, GPS signal reception may be weak or unavailable due to obstructions like walls and ceilings. For best results, use the module outdoors or near a window.

Q: How can I increase the update rate?
A: The update rate can be configured up to 10Hz by sending specific commands to the module. Refer to the ATGM336H datasheet for details on configuring the update rate.

Q: Does the module support external antennas?
A: The ATGM336H has a built-in antenna, but it does not support external antennas.

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.