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WiFi Controlled and Line Following NodeMCU Bot

Overview

This project features a versatile bot that can be controlled via WiFi using a NodeMCU microcontroller and an Android application, as well as autonomously follow a line using infrared sensors. The bot can switch between manual control and autonomous line-following mode.

Features

  • WiFi Control: Control the bot using an Android device connected to the same network.
  • Line Following: Autonomous navigation using infrared sensors.
  • Real-time Movement: Command the bot to move forward, backward, left, and right.
  • User-friendly Interface: Intuitive Android app for seamless control.
  • Extendable: Easily extend the bot's functionality with additional sensors or modules.

Hardware Requirements

  • NodeMCU (ESP8266)
  • Motor Driver Module (L298N or similar)
  • DC Motors and Wheels
  • Power Supply (e.g., Battery Pack)
  • Chassis for the bot
  • Jumper Wires
  • Infrared (IR) Sensor Module for line following

Software Requirements

  • Arduino IDE
  • NodeMCU board package for Arduino IDE
  • Provided Android APK for control

Setup Instructions

1. Hardware Assembly

  1. Motor Connection:

    • Connect the DC motors to the motor driver module.
    • Connect the motor driver module to the NodeMCU.
    • Ensure the power supply is properly connected to the motor driver module and NodeMCU.

  2. Pin Configuration (example with L298N):

    • Motor A: IN1 and IN2
    • Motor B: IN3 and IN4
    • NodeMCU Pin Connections:
      • IN1 -> D3
      • IN2 -> D4
      • IN3 -> D6
      • IN4 -> D7
    • Enable Pins (if required) connected to NodeMCU.

  3. IR Sensor Connection:

    • Connect the IR sensors to the NodeMCU.
    • Example Pin Configuration:
      • Left IR Sensor -> D5
      • Right IR Sensor -> D1

2. Software Setup

  1. Arduino IDE Configuration:

    • Install the latest version of the Arduino IDE from here.
    • Add the NodeMCU (ESP8266) board to Arduino IDE via the Board Manager.
      • Go to File -> Preferences
      • Add the following URL to "Additional Boards Manager URLs": http://arduino.esp8266.com/stable/package_esp8266com_index.json
      • Go to Tools -> Board -> Boards Manager and install "esp8266".

  2. Library Installation:

    • Ensure the necessary libraries are installed (e.g., ESP8266WiFi, ESP8266WebServer,WifiClient).

  3. Upload Code to NodeMCU:

    • Open the provided Source_code.ino file in Arduino IDE.
    • Modify the WiFi credentials in the code: 
      const char* ssid = "YOUR_SSID";
const char* password = "YOUR_PASSWORD";
    • Connect the NodeMCU to your computer and select the correct port and board from the Tools menu.
    • Upload the code to the NodeMCU.

3. Android App Setup

  1. Install APK:
    • Transfer the provided APK file to your Android device.
    • Open the APK file on your Android device and follow the prompts to install it.

Usage

  1. Power on the bot.
  2. Connect your Android device to the same WiFi network as the NodeMCU.
  3. Open the app on your Android device.
  4. Use the app interface to switch between manual control and line-following mode.

Manual Control Mode

  • Use the app to control the bot's movements in real time.

Line Following Mode

  • Place the bot on a line (typically a black line on a white surface).
  • The bot will use its IR sensors to follow the line autonomously.

Customization

  • IR Sensor Calibration: Adjust the IR sensor thresholds in the code to ensure accurate line following.
  • Additional Features: Integrate more sensors (e.g., ultrasonic sensors for obstacle detection) by expanding the NodeMCU code.

Troubleshooting

  • No Connection: Ensure the NodeMCU is correctly connected to the WiFi network and the correct IP address is used in the app.
  • Motor Issues: Check all connections and ensure the motor driver module is properly powered.
  • Code Upload Failures: Verify the correct board and port are selected in the Arduino IDE.
  • Line Following Issues: Ensure the IR sensors are correctly positioned and calibrated.

License

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

Contact

For any issues or inquiries, please open an issue in this repository.

Enjoy building and controlling your WiFi-controlled and line-following NodeMCU bot with the provided Android app!