HOVER CAR FLOATING CAR

Hover Car Floating Car project aims to create a hover floating car that navigates on water using motors and fans, detects obstacles using two ultrasonic sensors, and can be controlled via a Bluetooth app. The car includes an alcohol detector to stop the motor when alcohol is detected, an RFID system with a servo motor for secure locking inside the car, and an I2C display to show messages.

Components Required

1. Arduino MEGA – 1
2. Ultrasonic Sensors (e.g., HC-SR04) – 2
3. Bluetooth Module (e.g., HC-05) – 1
4. DC Motors – 4 (2 for propulsion with motor driver, 2 for auxiliary functions with switches)
5. Motor Driver (e.g., L298N) – 1
6. Alcohol Sensor (e.g., MQ-3) – 1
7. RFID Module (e.g., MFRC522) – 1
8. Servo Motor – 1
9. I2C LCD Display – 1
10. Switches – 2 (for controlling auxiliary motors)
11. Breadboard and Jumper Wires – Several
12. Power Supply – For Arduino and motors
13. Hovercraft body – For the floating base

Connections

Arduino to Ultrasonic Sensors:

1. Ultrasonic Sensor 1:
   • Trig to D2
   • Echo to D3
   • VCC to 5V
   • GND to GND
2. Ultrasonic Sensor 2:
   • Trig to D4
   • Echo to D5
   • VCC to 5V
   • GND to GND

Arduino to Bluetooth Module (HC-05/HC-06):

1. Bluetooth TX to Arduino RX (pin 11)
2. Bluetooth RX to Arduino TX (pin 10)
3. Bluetooth VCC to 5V
4. Bluetooth GND to GND

Arduino to Motor Driver (L298N):

1. Motor 1:
   • Connected to Motor A output of L298N
2. Motor 2:
   • Connected to Motor B output of L298N
3. L298N Inputs:
   • IN1 to 6
   • IN2 to 3
   • IN3 to 7
   • IN4 to 2
4. L298N Enable Pins:
   • ENA to D8
   • ENB to D9

Arduino to Alcohol Sensor:

1. AO (Analog Output) to A3
2. VCC to 5V
3. GND to GND

Arduino to RFID Module:

1. SDA to 53
2. SCK to D13
3. MOSI to D11
4. MISO to D12
5. RST to 15
6. VCC to 3.3V
7. GND to GND

Arduino to Servo Motor:

1. Signal to D12
2. VCC to 5V
3. GND to GND

Arduino to I2C Display:

1. SDA to A4
2. SCL to A5
3. VCC to 5V
4. GND to GND

Switches to Additional DC Motors:

1. DC_MOTOR_Switch 1:
   • One terminal to motor 1 positive terminal
   • Others terminal to motor 1 negative terminal and 5V through a pull-down resistor
   • Switch pin to Arduino D14
2. DC_MOTOR_Switch 2:
   • One terminal to motor 2 positive terminals
   • Others terminal to motor 2 negative terminal and 5V through a pull-down resistor
   • Switch pin to Arduino D16

#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <SoftwareSerial.h>
#include <Servo.h>
#include <SPI.h>
#include <MFRC522.h>

#define trigPin1 11
#define echoPin1 10
#define trigPin2 13
#define echoPin2 12
#define in1 6
#define in2 3
#define in3 7
#define in4 2
#define enA 8
#define enB 9
#define alcoholSensor A10
#define SS_PIN 53
#define RST_PIN 15
#define SERVO_PIN 17
#define SWITCH1 14
#define SWITCH2 16
#define ALCOHOL_THRESHOLD 300 // Adjust as necessary

SoftwareSerial bluetooth(11, 10);
Servo myServo;
MFRC522 mfrc522(SS_PIN, RST_PIN);
LiquidCrystal_I2C lcd(0x27, 16, 2); // I2C address 0x27, 16 column and 2 rows

void setup() {
  Serial.begin(9600);
  bluetooth.begin(9600);
  lcd.begin(16, 2);
  lcd.init();
  lcd.backlight();
  
  pinMode(trigPin1, OUTPUT);
  pinMode(echoPin1, INPUT);
  pinMode(trigPin2, OUTPUT);
  pinMode(echoPin2, INPUT);
  pinMode(in1, OUTPUT);
  pinMode(in2, OUTPUT);
  pinMode(in3, OUTPUT);
  pinMode(in4, OUTPUT);
  pinMode(alcoholSensor, INPUT);
  pinMode(SWITCH1, INPUT_PULLUP);
  pinMode(SWITCH2, INPUT_PULLUP);

  SPI.begin();
  mfrc522.PCD_Init();
  myServo.attach(SERVO_PIN);
  myServo.write(0); // Lock initially
}

void loop() {
  long duration1, distance1, duration2, distance2;

  // Ultrasonic sensor 1
  digitalWrite(trigPin1, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin1, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin1, LOW);
  duration1 = pulseIn(echoPin1, HIGH);
  distance1 = (duration1 / 2) / 29.1;

  // Ultrasonic sensor 2
  digitalWrite(trigPin2, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin2, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin2, LOW);
  duration2 = pulseIn(echoPin2, HIGH);
  distance2 = (duration2 / 2) / 29.1;

  // Obstacle avoidance
  if (distance1 < 30 || distance2 < 30) {
    stopCar();
  } else {
    // Normal operation, control via Bluetooth
    if (bluetooth.available()) {
      char command = bluetooth.read();
      controlCar(command);
    }
  }

  // Alcohol detection
  int alcoholLevel = analogRead(alcoholSensor);
  if (alcoholLevel > ALCOHOL_THRESHOLD) {
    stopCar();
    lcd.clear();
    lcd.print("Alcohol Detected");
  } else {
    lcd.clear();
    lcd.print("All Clear");
  }

  // RFID check for lock
  if (mfrc522.PICC_IsNewCardPresent() && mfrc522.PICC_ReadCardSerial()) {
    unlockCar();
  }

  // Control auxiliary motors with switches
  if (digitalRead(SWITCH1) == LOW) {
    // Code to control motor 1
    digitalWrite(motor1Pin, HIGH); // Adjust motor1Pin accordingly
  } else {
    digitalWrite(motor1Pin, LOW); // Adjust motor1Pin accordingly
  }

  if (digitalRead(SWITCH2) == LOW) {
    // Code to control motor 2
    digitalWrite(motor2Pin, HIGH); // Adjust motor2Pin accordingly
  } else {
    digitalWrite(motor2Pin, LOW); // Adjust motor2Pin accordingly
  }

  delay(100);
}

void controlCar(char command) {
  switch (command) {
    case 'F':
      moveForward();
      break;
    case 'B':
      moveBackward();
      break;
    case 'L':
      turnLeft();
      break;
    case 'R':
      turnRight();
      break;
    case 'S':
      stopCar();
      break;
  }
}

void moveForward() {
  digitalWrite(in1, HIGH);
  digitalWrite(in2, LOW);
  digitalWrite(in3, HIGH);
  digitalWrite(in4, LOW);
}

void moveBackward() {
  digitalWrite(in1, LOW);
  digitalWrite(in2, HIGH);
  digitalWrite(in3, LOW);
  digitalWrite(in4, HIGH);
}

void turnLeft() {
  digitalWrite(in1, LOW);
  digitalWrite(in2, HIGH);
  digitalWrite(in3, HIGH);
  digitalWrite(in4, LOW);
}

void turnRight() {
  digitalWrite(in1, HIGH);
  digitalWrite(in2, LOW);
  digitalWrite(in3, LOW);
  digitalWrite(in4, HIGH);
}

void stopCar() {
  digitalWrite(in1, LOW);
  digitalWrite(in2, LOW);
  digitalWrite(in3, LOW);
  digitalWrite(in4, LOW);
}

void unlockCar() {
  myServo.write(90); // Unlock position
  delay(3000);
  myServo.write(0); // Lock position
}