ESP32 Firebase Random Data Logger

This project demonstrates how to use an ESP32 microcontroller to generate random floating-point numbers and log them to a Firebase Realtime Database. The code also synchronizes time using an NTP server for timestamping the data entries.

Overview

• WiFi Connection: Connects to a specified WiFi network.
• Time Synchronization: Uses the NTPClient library to synchronize time.
• Firebase Integration: Logs random floating-point numbers to a Firebase Realtime Database.
• Random Number Generation: Generates random numbers every second.

Prerequisites

1. ESP32 Board: Ensure you have an ESP32 development board.

2. Libraries: Install the following libraries via the Arduino Library Manager or manually:

   • WiFi
   • Firebase
   • NTPClient
   • WiFiUdp

3. Firebase Setup: Set up a Firebase project and obtain the REFERENCE_URL for your Firebase Realtime Database.

Installation

1. Clone the Repository: Clone or download the code to your local machine.

2. Set Up Secrets:

   • Create a file named secrets.h in the same directory as the main code.
   • Add the following contents to secrets.h:

     #define SSID "your_wifi_ssid"
     #define PASSWORD "your_wifi_password"
     #define REFERENCE_URL "https://your-firebase-app.firebaseio.com/"

   • Replace "your_wifi_ssid", "your_wifi_password", and "https://your-firebase-app.firebaseio.com/" with your actual WiFi credentials and Firebase URL.

3. Upload the Code:

   • Open the code in the Arduino IDE or compatible development environment.
   • Select the appropriate board and port from the Tools menu.
   • Upload the code to the ESP32 board.

Code Explanation

• Includes: The code includes necessary libraries for WiFi, Firebase, and NTPClient functionality.

• Global Variables:

  • GMT_OFFSET: Time offset for NTP.
  • fb: Firebase object initialized with REFERENCE_URL.
  • ntpUDP and timeClient: Used for time synchronization.

• setup() Function:

  • Initializes serial communication and connects to the WiFi network.
  • Prints the local IP address of the ESP32.
  • Initializes the NTPClient to get time and sets the time offset.
  • Seeds the random number generator with the current epoch time.

• loop() Function:

  • Updates the NTPClient to get the current time.
  • Generates a random floating-point number between 0 and 10.
  • Logs the random number to Firebase with the current time as a key.
  • Waits for 1 second before repeating.

Troubleshooting

• WiFi Connection Issues: Ensure that the SSID and password in secrets.h are correct and that your WiFi network is working.
• Firebase Connectivity: Verify that the REFERENCE_URL is correct and that your Firebase Realtime Database rules allow writing data.
• Time Synchronization: Ensure that your ESP32 is connected to the internet for NTP time synchronization.

License

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

Contact

For questions or issues, please open an issue on the project's repository or contact [email protected].

Happy coding!