A GPS tracking system using STM32F103 microcontroller and SIM808 GSM/GPS module that sends location data to a web server via HTTP requests.

• GPS location tracking using SIM808 module
• GPRS connectivity for data transmission
• Real-time location updates to web server
• Interrupt-based UART communication
• Debug output via serial console
• Robust error handling and GPS fix detection

• STM32 microcontroller (tested on STM32F4xx series)
• SIM808 GSM/GPS module
• GPS antenna
• GSM antenna
• SIM card with data plan
• 5V 2A power supply

STM32 SIM808 ----- ------ PA9 (TX1) -> RX PA10 (RX1) <- TX PA2 (TX2) -> Debug UART (optional) GND -> GND 

• STM32CubeIDE or compatible IDE
• STM32 HAL Library
• STM32CubeMX (for configuration)
• AT_commands DataSheet

• Open the project in STM32CubeIDE.
• Configure the clock to HSI and SYSCLK at 8 MHz.
• Enable USART1 (AT commands) and USART2 (debug) in Asynchronous mode.
• Enable NVIC interrupts for USART1.
• Generate code and replace src/main.c with the provided implementation.
• Build and flash the firmware to the STM32.

• USART1: SIM808 communication (9600 baud)
• USART2: Debug output (9600 baud)
• Enable interrupt

• APN: Update in main.c according to your carrier
• Server URL: Modify the HTTP endpoint in submitHttpRequest()

1. Clone this repository:

git clone https://github.com/Reza-Shojaei/stm32-sim808-gps-tracker.git cd stm32-sim808-gps-tracker

2. Open the project in STM32CubeIDE

3. Configure your target STM32 device in STM32CubeMX

4. Update the following in Core/Src/main.c:

   • APN settings for your mobile carrier
   • Server URL and API key
   • GPIO pin assignments if different

5. Build and flash to your STM32 device

1. Insert a SIM card with data plan into the SIM808 module
2. Connect GPS and GSM antennas
3. Power on the system
4. Monitor debug output via UART2
5. The system will:
   • Initialize SIM808 module
   • Wait for GPS fix
   • Send location data to server every 10 seconds

The system sends HTTP GET requests in this format:

http://yourserver.com/gpsdata.php?key=YOUR_KEY&lat=LATITUDE&lng=LONGITUDE 

Monitor the serial output to see:

• System initialization status
• GPS fix status
• Raw GPS data from SIM808
• HTTP request status
• Error messages

• Ensure GPS antenna is connected and has clear sky view
• Wait 30+ seconds for initial GPS fix
• Check that GPS power is enabled (AT+CGNSPWR=1)

• Verify SIM card has data plan and is active
• Check APN settings for your carrier
• Ensure good GSM signal strength

• Verify baud rate settings match between STM32 and SIM808
• Check RX/TX wiring connections
• Monitor for proper AT command responses

stm32-sim808-gps-tracker/ ├── Core/ │ ├── Inc/ │ │ ├── main.h │ │ ├── usart.h │ │ └── gpio.h │ └── Src/ │ ├── main.c │ ├── usart.c │ ├── gpio.c │ └── stm32f4xx_it.c ├── Drivers/ │ └── STM32F4xx_HAL_Driver/ ├── docs/ │ └── AT_commands.md ├── README.md ├── LICENSE └── uart_gps_01.ioc 

This project is licensed under the MIT License - see the LICENSE file for details.

• STMicroelectronics for STM32 HAL library
• SIMCom for SIM808 module documentation
• Community contributors and testers

Note: This project is for educational and hobbyist purposes. Ensure compliance with local regulations regarding GPS tracking and data transmission.