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Arduino UNO Bluetooth Controlled Car with Flame Sensors and Water Pump

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Circuit Documentation

Summary

This document provides a detailed overview of a Bluetooth-controlled car circuit. The circuit includes various components such as an Arduino UNO, L298N DC motor driver, motors, sensors, a relay, a water pump, and a Bluetooth module. The Arduino UNO is programmed to control the car's movements based on commands received via Bluetooth.

Component List

  1. L298N DC Motor Driver

    • Description: Motor driver module used to control the speed and direction of DC motors.
    • Pins: OUT1, OUT2, 12V, GND, 5V, OUT3, OUT4, 5V-ENA-JMP-I, 5V-ENA-JMP-O, +5V-J1, +5V-J2, ENA, IN1, IN2, IN3, IN4, ENB

  2. HC-05 Bluetooth Module

    • Description: Bluetooth module used for wireless communication.
    • Pins: EN, VCC, GND, TXD, RXD, STATE

  3. Battery 12V

    • Description: Power source for the circuit.
    • Pins: +, -

  4. Motor and Wheels

    • Description: DC motors with attached wheels for movement.
    • Pins: vcc, GND

  5. 5V Mini Water Pump

    • Description: Water pump used for liquid transfer.
    • Pins: positive pin, negative pin

  6. MKE-S04 IR Infrared Flame Sensor

    • Description: Sensor used to detect flames.
    • Pins: SIG, 5V, GND

  7. Tower Pro SG90 Servo

    • Description: Servo motor used for precise control of angular position.
    • Pins: Signal, +5V, GND

  8. Arduino UNO

    • Description: Microcontroller board used to control the circuit.
    • Pins: UNUSED, IOREF, Reset, 3.3V, 5V, GND, Vin, A0, A1, A2, A3, A4, A5, SCL, SDA, AREF, D13, D12, D11, D10, D9, D8, D7, D6, D5, D4, D3, D2, D1, D0

  9. 1 Channel Relay 5V

    • Description: Relay module used to control high voltage devices.
    • Pins: VCC, GND, IN, NC, COM, NO

  10. Piezo Buzzer

    • Description: Buzzer used for sound output.
    • Pins: pin 1, pin 2

Wiring Details

L298N DC Motor Driver

HC-05 Bluetooth Module

Battery 12V

Motor and Wheels

5V Mini Water Pump

MKE-S04 IR Infrared Flame Sensor

Tower Pro SG90 Servo

Arduino UNO

1 Channel Relay 5V

Piezo Buzzer

Documented Code

//Arduino Bluetooth Controlled Car
//Before uploading the code you have to install the necessary library
//Note - Disconnect the Bluetooth Module before hitting the upload button otherwise you'll get a compilation error message.
//AFMotor Library https://learn.adafruit.com/adafruit-motor-shield/library-install 
//After downloading the library open Arduino IDE >> go to sketch >> Include Library >> ADD. ZIP Library >> Select the downloaded 
//ZIP File >> Open it >> Done
//Now You Can Upload the Code without any problem but make sure the bt module isn't connected with Arduino while uploading code

#include <AFMotor.h>

//initial motors pin
AF_DCMotor motor1(1, MOTOR12_1KHZ); 
AF_DCMotor motor2(2, MOTOR12_1KHZ); 
AF_DCMotor motor3(3, MOTOR34_1KHZ);
AF_DCMotor motor4(4, MOTOR34_1KHZ);

char command; 

void setup() 
{       
  Serial.begin(9600);  //Set the baud rate to your Bluetooth module.
}

void loop(){
  if(Serial.available() > 0){ 
    command = Serial.read(); 
    Stop(); //initialize with motors stopped
    //Change pin mode only if new command is different from previous.   
    //Serial.println(command);
    switch(command){
    case 'F':  
      forward();
      break;
    case 'B':  
       back();
      break;
    case 'L':  
      left();
      break;
    case 'R':
      right();
      break;
    }
  } 
}

void forward()
{
  motor1.setSpeed(255); //Define maximum velocity
  motor1.run(FORWARD); //rotate the motor clockwise
  motor2.setSpeed(255); //Define maximum velocity
  motor2.run(FORWARD); //rotate the motor clockwise
  motor