/ESP32-Flutter-Bluetooth-pair

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FlexiScan ESP32 MPU-6050 with Bluetooth Communication

Overview

This project demonstrates how to use an ESP32 microcontroller to communicate with a Flutter app via Bluetooth, along with MPU-6050 sensor integration for accelerometer and gyroscope data. The project includes basic authentication, real-time sensor data transmission, and LED indicators for connection status, authentication, and data transmission.

Features

  • MPU-6050 Integration: Reads accelerometer and gyroscope data.
  • Bluetooth Communication: Uses ESP32 Bluetooth to send sensor data to a Flutter app.
  • Authentication: Ensures secure communication using a predefined secret key.
  • LED Indicators:
    • Green LED: Indicates successful MPU initialization and authentication.
    • Red LED: Indicates Bluetooth connection status.
    • Blue LED: Blinks during data transmission.

Hardware Requirements

  • ESP32
  • MPU-6050 Sensor
  • 4 LEDs (Green/Red/Blue for various status indicators)
  • Resistors (for LEDs, typically 220Ω)
  • Jumper Wires
  • Breadboard (optional)

Pin Connections:

Component ESP32 Pin
Red/Green LED (for MPU Init) D14
Green LED (for Authentication) D27
Red LED (for Bluetooth) D26
Blue LED (for Data Transmission) D25
MPU-6050 SDA GPIO 21
MPU-6050 SCL GPIO 22

Software Requirements

  • Arduino IDE
  • BluetoothSerial Library
  • Adafruit MPU6050 Library

Setup

  1. Install Arduino IDE and add the ESP32 board by following this guide.
  2. Install the required libraries:
    • BluetoothSerial: This is included with ESP32 boards support.
    • Adafruit MPU6050: Can be installed via Arduino IDE Library Manager.
  3. Wiring: Connect the MPU-6050 sensor and LEDs according to the pin connections in the table above.
  4. Upload Code: Upload the provided sketch to your ESP32 using Arduino IDE.
  5. Flutter App: Ensure that the Flutter app communicates via Bluetooth and uses the same secretKey for authentication.

Code Explanation

  • Bluetooth Setup: Initializes Bluetooth communication using SerialBT and registers a callback function for connection events.
  • MPU-6050 Initialization: Uses mpu.begin() to initialize the MPU sensor. The LED connected to pin D14 will turn green when successful.
  • Authentication: The ESP32 authenticates a client by checking the received Bluetooth message against the predefined secretKey.
  • Sensor Data Transmission: After authentication, the ESP32 sends accelerometer and gyroscope data from the MPU-6050 to the Flutter app every second. The blue LED blinks to indicate data transmission.