ESP32-NMEA-Generator-Decoder-WebServer

ESP32 NMEA Data Generation and Decoding

This project demonstrates an ESP32-based system for generating and decoding NMEA (National Marine Electronics Association) data. The ESP32 connects to a Wi-Fi network and hosts a web server that provides a user interface for generating sample NMEA data and uploading NMEA files for decoding.

Features

• Random NMEA Data Generation: Generates random NMEA sentences (GPGGA) with valid checksums.
• Web Interface: Provides a user-friendly web interface to generate and display NMEA data.
• File Upload and Decoding: Allows users to upload NMEA files for decoding and displays the parsed data.
• Data Parsing: Parses and decodes GPGGA sentences to extract time, latitude, longitude, and satellite count.

Getting Started

Prerequisites

• ESP32 development board
• Arduino IDE
• Wi-Fi network credentials

Installation

1. Clone the repository:

    git clone https://github.com/Esmail-sarhadi/ESP32-NMEA-Generator-Decoder-WebServer.git
   

2. Open the project in Arduino IDE:
   • File -> Open -> Select esp32-nmea-data.ino
3. Install necessary libraries:
   • Install WiFi, WebServer, FS, and SPIFFS from the Arduino Library Manager if not already installed.
4. Update Wi-Fi credentials:
   • Replace the placeholder values in the code with your actual Wi-Fi SSID and password:

      const char* ssid = "your_SSID";
      const char* password = "your_PASSWORD";
     

5. Upload the code to the ESP32:
   • Connect your ESP32 board to your computer and upload the code from the Arduino IDE.

Usage

1. Connect to Wi-Fi:
   • Upon startup, the ESP32 will attempt to connect to the specified Wi-Fi network.
   • Open the Serial Monitor in Arduino IDE to see the connection status and the IP address assigned to the ESP32.
2. Access the Web Interface:
   • Once connected, the ESP32 will start a web server. Open a web browser and navigate to the IP address displayed in the Serial Monitor to access the interface.
3. Generate NMEA Data:
   • Click the “Generate Sample Data” button to generate and display random NMEA data.
4. Upload NMEA File:
   • Click the “Upload NMEA File” button to upload a file from your computer. The decoded data will be displayed.

Project Structure

• esp32-nmea-data.ino: The main Arduino sketch that initializes the web server and handles requests.
• index.html: The HTML file served to the client, containing the web interface.
• data: Directory containing additional files to be served by the ESP32 (if any).

Functions

• generateRandomNMEAData(): Generates random NMEA sentences.
• generateRandomTime(): Generates a random time string.
• generateRandomCoordinate(bool isLatitude): Generates random latitude or longitude coordinates.
• generateRandomSatelliteCount(): Generates a random satellite count.
• calculateChecksum(String nmea): Calculates the checksum for an NMEA sentence.
• decodeNMEAData(String nmea_data): Decodes NMEA data and extracts information from GPGGA sentences.
• process_gpgga_line(const String& line, GPGGAData& data): Processes individual GPGGA sentences.

Detailed Function Descriptions

generateRandomNMEAData()

Generates a series of random NMEA sentences (GPGGA) with valid checksums. This function creates 10 GPGGA sentences with randomly generated time, coordinates, and satellite counts.

generateRandomTime()

Generates a random time string in the format HHMMSS. This is used to simulate the time component in NMEA sentences.

generateRandomCoordinate(bool isLatitude)

Generates a random coordinate string. If isLatitude is true, it generates a latitude coordinate; otherwise, it generates a longitude coordinate. The coordinates are generated in degrees and minutes, with a random direction (N/S for latitude, E/W for longitude).

generateRandomSatelliteCount()

Generates a random satellite count between 1 and 12. This simulates the number of satellites tracked by the receiver.

calculateChecksum(String nmea)

Calculates the checksum for an NMEA sentence. The checksum is calculated by XORing all characters between the ‘$’ and ‘*’ characters in the sentence.

decodeNMEAData(String nmea_data)

Decodes NMEA data, specifically GPGGA sentences, and extracts information such as time, latitude, longitude, and satellite count. The extracted data is formatted into a human-readable string.

process_gpgga_line(const String& line, GPGGAData& data)

Processes an individual GPGGA sentence and extracts the relevant data into a GPGGAData structure. This function splits the sentence into its components and assigns them to the corresponding fields in the GPGGAData structure.

Profile

Check out my GitHub profile: Esmail Sarhadi

Project Link

View this project on GitHub: ESP32-NMEA-Generator-Decoder-WebServer

Donation

If you find this project helpful, consider making a donation:

License

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

Acknowledgments

• This project was inspired by the need to understand and work with NMEA data in IoT applications.
• Special thanks to the open-source community for providing resources and libraries that made this project possible.

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