How to Use SIM808 GSM GPS GPRS module: Examples, Pinouts, and Specs

The SIM808 module is a versatile electronic component that combines GSM, GPS, and GPRS functionalities. This integration allows for mobile communication, location tracking, and data transmission, making it an ideal choice for a wide range of applications. Common use cases include vehicle tracking systems, remote data logging, IoT projects, and mobile communication devices.

1. Power Supply: Connect the VCC pin to a stable 3.4V - 4.4V power source and the GND pin to the ground.
2. UART Communication: Connect the TXD pin to the RX pin of your microcontroller (e.g., Arduino UNO) and the RXD pin to the TX pin of your microcontroller.
3. Power Control: To turn on the module, connect the PWRKEY pin to the ground for at least 1 second.
4. GPS Functionality: Connect the GPS_TX and GPS_RX pins to the corresponding UART pins of your microcontroller if you need GPS data.
5. Antenna: Attach the GSM and GPS antennas to their respective connectors on the module.

• Power Supply: Ensure a stable power supply to avoid unexpected resets or malfunctions.
• Antenna Placement: Place the antennas in a location with minimal obstructions for better signal reception.
• UART Baud Rate: Configure the UART baud rate to match the module's default setting (usually 9600 bps).
• Heat Dissipation: Provide adequate ventilation to prevent overheating during prolonged use.

#include <SoftwareSerial.h>

// Create a software serial port on pins 7 (RX) and 8 (TX)
SoftwareSerial sim808(7, 8);

void setup() {
  // Start communication with the SIM808 module at 9600 baud
  sim808.begin(9600);
  Serial.begin(9600);
  
  // Power on the module
  pinMode(9, OUTPUT);
  digitalWrite(9, LOW);
  delay(1000);
  digitalWrite(9, HIGH);
  delay(2000);
  digitalWrite(9, LOW);
  
  // Wait for the module to initialize
  delay(5000);
  
  // Send an AT command to check communication
  sim808.println("AT");
  delay(1000);
  
  // Read and print the response from the module
  while (sim808.available()) {
    Serial.write(sim808.read());
  }
}

void loop() {
  // Continuously read data from the SIM808 module and print it to the serial monitor
  if (sim808.available()) {
    Serial.write(sim808.read());
  }
  
  // Continuously read data from the serial monitor and send it to the SIM808 module
  if (Serial.available()) {
    sim808.write(Serial.read());
  }
}

1. Module Not Responding:

   • Solution: Ensure the power supply is stable and within the specified range. Check the PWRKEY pin connection and ensure it is correctly toggled.

2. Poor Signal Reception:

   • Solution: Verify that the antennas are properly connected and placed in an optimal location. Check for any physical obstructions that may be blocking the signal.

3. GPS Data Not Received:

   • Solution: Ensure the GPS_TX and GPS_RX pins are correctly connected to the microcontroller. Verify that the module has a clear view of the sky for better satellite reception.

4. Communication Issues:

   • Solution: Check the UART connections and ensure the baud rate is correctly set. Use a logic level converter if interfacing with a 5V microcontroller.

• Q: Can the SIM808 module be powered with a 5V supply?

  • A: No, the module requires a power supply within the range of 3.4V to 4.4V.

• Q: How do I reset the module?

  • A: Toggle the RST pin to the ground for a brief moment to reset the module.

• Q: What is the default baud rate for UART communication?

  • A: The default baud rate is 9600 bps.

• Q: Can I use the SIM808 module for voice calls?

  • A: Yes, the module supports voice calls. Connect a microphone and speaker to the MIC+/- and SPK+/- pins, respectively.

This documentation provides a comprehensive guide to using the SIM808 GSM GPS GPRS module, ensuring both beginners and experienced users can effectively integrate it into their projects.