SIM808 GSM GPRS GPS Development Board with GPS Antenna

Connect the board's UART_TXD and UART_RXD pins to your microcontroller's UART RX and TX pins, respectively. Use a logic level converter if your MCU is 5V. Power the module, open a serial terminal (e.g., Arduino IDE Serial Monitor, PuTTY) set to 9600 or 115200 baud, and send commands like 'AT' to check connectivity. All GSM, GPRS, and GPS functions are controlled via specific AT command sets detailed in the SIM808 AT command manual.

For battery operation, connect a 3.7V Li-Ion cell (3.4-4.2V range) to the designated battery input pins; the onboard circuitry manages charging. For a wall adapter or vehicle power, use the 5-26V DC input port, ensuring it can supply up to 2A if the voltage is below 9V. Always use a stable power source, as voltage spikes can damage the RF section. The module draws ~10mA during active RF transmission and ~80mA in standby.

First, ensure the GPS antenna has a clear view of the sky. Send the AT command 'AT+CGPS=1' to enable the GPS receiver. Wait for a fix, which may take 30-60 seconds cold start. Then, query the location with 'AT+CGPSINFO' to receive raw NMEA data (latitude, longitude, UTC time). You can parse this NMEA string in your microcontroller firmware or send it directly over GPRS to a server for mapping and logging.

Yes. After inserting a valid 2G SIM card, use AT commands to attach to the GPRS network: 'AT+CGATT=1'. Then, activate a PDP context with your carrier's APN: 'AT+CSTT="APN"'. Open a TCP or UDP connection to your server's IP and port: 'AT+CIPSTART="TCP","server.com",port'. Finally, send data with 'AT+CIPSEND'. The module supports HTTP and MQTT protocols at the application layer, which you must implement by sending the appropriate formatted strings over the TCP link.