Embedded-Systems-Programming

Team Members : Ajay Baby, Sai Motupalli, Akash Patil

Indicators,Engine Temperature, Cabin Light System with Nucleo F446RE and NodeMCU ESP8266

Overview

This project is designed to control indicator LEDs and cabin lights based on sensor readings, and send status updates to an ESP8266 module. The project uses the Nucleo F446RE board to control the indicator LEDs and the cabin light. The NodeMCU ESP8266 board is used to send data wirelessly, which includes the status of the indicators and cabin light. The system is built using mbed OS 6.17, and developed in Visual Studio Code.

Project Components

Hardware:
- Nucleo F446RE board
- NodeMCU ESP8266 board
- Left and Right Indicator LEDs
- Left and Right Indicator Buttons
- Light-dependent Resistor (LDR) for cabin light control
- Temperature Sensor (for Engine Temperature control)
Software:
- mbed OS 6.17
- Visual Studio Code (VS Code) with mbed OS and PlatformIO extensions

Features

Indicator LED Control:
- The left and right indicator LEDs blink when the respective button is pressed.
- Each indicator blinks for 5 seconds after a button press, without needing to hold the button.
Cabin Light Control:
- The cabin light automatically turns on/off based on LDR sensor readings.
- If the LDR value is below a certain threshold, the cabin light is turned on.
ESP8266 Communication:
- The status of the indicators and cabin light is sent to the NodeMCU ESP8266 over serial communication.
- The ESP8266 can send data back to the Nucleo board if needed for debugging or feedback.

Setup

Hardware Connections

Nucleo F446RE to NodeMCU ESP8266:
- Connect TX (Nucleo) to RX (ESP8266) and RX (Nucleo) to TX (ESP8266).
- Connect GND of the Nucleo to GND of the NodeMCU.
Indicator LEDs:
- Left LED to PB_0 (Nucleo).
- Right LED to PB_1 (Nucleo).
Indicator Buttons:
- Left Button to PA_0 (Nucleo).
- Right Button to PA_1 (Nucleo).
LDR for Cabin Lights:
- The LDR can be connected to an analog pin (e.g., PA_4) for reading light levels.
- The Cabin light can be controlled using a DigitalOut pin (e.g., PB_0).

Software Setup

Install mbed OS 6.17:
- Ensure you have mbed OS 6.17 installed and correctly configured with your Nucleo F446RE board in your development environment.
VS Code Setup:
- Install VS Code and the PlatformIO extension.
- Open the project folder in VS Code and use PlatformIO to build and upload the code to your Nucleo board.
Install Required Libraries:
- If using any specific libraries (e.g., for the temperature sensor, LDR, etc.), make sure they are installed through the mbed OS library manager.
Flash the Code to Nucleo F446RE:
- Build and upload the code to the Nucleo F446RE using the PlatformIO extension in VS Code.
- Open a terminal or serial monitor to observe the indicator and cabin light status, and communicate with the NodeMCU ESP8266.

Communication with ESP8266

Data is sent from the Nucleo board to the ESP8266 over serial communication. You can use BufferedSerial on both boards.
You may need to monitor data on a serial terminal (like Tera Term or Putty) connected to the NodeMCU ESP8266 to see status messages.

Code Structure

Files and Directories:

main.cpp: Main program for reading sensor data and controlling LEDs and cabin lights.
Indicator.h and Indicator.cpp: Classes for controlling the indicator LEDs.
ESP8266.h and ESP8266.cpp: Classes for sending data to and receiving data from the ESP8266.

Key Classes:

Indicator:
- Handles reading button presses for left and right indicators.
- Controls the indicator LEDs based on button presses and blinks the LEDs for 5 seconds after a button press.
ESP8266:
- Handles serial communication with the ESP8266 module.
- Sends the indicator and cabin light status to the ESP8266 and receives any data from it.

Usage

Indicator LED Behavior:
- Press the left or right button once, and the corresponding indicator LED will blink for 5 seconds.
- The LEDs will automatically stop blinking after 5 seconds or once the button is released.
Cabin Light Control:
- The cabin light will automatically turn on when the LDR value is below a specified threshold.
- The cabin light will turn off when the light level is above the threshold.
Data Communication:
- The Nucleo board continuously sends the status of the indicators and cabin light to the NodeMCU ESP8266.
- Optionally, the ESP8266 can send data back to the Nucleo, which will be displayed on the serial monitor.

Troubleshooting

Indicator LEDs Not Blinking:
- Check the wiring for correct connections.
- Ensure the buttons are correctly wired and functioning.
- Verify that the debounce time is properly set.
Communication Issues:
- Ensure that the TX/RX pins between the Nucleo and NodeMCU are correctly connected.
- Verify that the baud rate is the same on both ends.
- Make sure both devices are properly powered.

Contributing

Feel free to open issues or create pull requests for improvements. If you have suggestions for additional features or fixes, please contribute!

License

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

Acknowledgements

The mbed OS development environment.
Nucleo F446RE and NodeMCU ESP8266 documentation for hardware and firmware setup.

7058CEM-2425SEPJAN/SmartCarEnv

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