Circuit Documentation

Summary of the Circuit

This circuit is designed to control a front-wheel-drive RC car using voice commands received through an HC-05 Bluetooth module. The Arduino UNO microcontroller processes the commands and controls the L298N motor driver, which in turn drives two hobby motors. The circuit is powered by a 9V battery, and the Arduino UNO regulates the voltage for the HC-05 Bluetooth module.

Component List

Arduino UNO

• Microcontroller board based on the ATmega328P
• It has 14 digital input/output pins, 6 analog inputs, a 16 MHz quartz crystal, a USB connection, a power jack, an ICSP header, and a reset button.

L298N DC Motor Driver

• A module that can control up to two DC motors with independent speed and direction control
• It is equipped with two H-bridge drivers and is capable of driving motors from 5V to 35V at up to 2A.

HC-05 Bluetooth Module

• A wireless communication module that can be used for serial communication
• It operates on Bluetooth 2.0 with the default serial port profile (SPP).

Motor Amarillo Motorreductor Hobby (x2)

• A yellow hobby gear motor suitable for small robotics and RC applications
• Typically operates on voltages around 6V to 9V.

9V Battery

• A standard 9V battery used to power the circuit.

Wiring Details

Arduino UNO

• 5V connected to HC-05 Bluetooth Module VCC
• GND connected to HC-05 Bluetooth Module GND and L298N DC Motor Driver GND
• Vin connected to L298N DC Motor Driver 5V
• D11 connected to L298N DC Motor Driver IN4
• D10 connected to L298N DC Motor Driver IN3
• D9 connected to L298N DC Motor Driver IN2
• D8 connected to L298N DC Motor Driver IN1
• D6 connected to L298N DC Motor Driver ENB
• D5 connected to L298N DC Motor Driver ENA
• D1 connected to HC-05 Bluetooth Module RXD
• D0 connected to HC-05 Bluetooth Module TXD

L298N DC Motor Driver

• GND connected to 9V Battery - and Arduino UNO GND
• 5V connected to Arduino UNO Vin
• IN4 connected to Arduino UNO D11
• IN3 connected to Arduino UNO D10
• IN2 connected to Arduino UNO D9
• IN1 connected to Arduino UNO D8
• ENB connected to Arduino UNO D6
• ENA connected to Arduino UNO D5
• 12V connected to 9V Battery +
• OUT1 connected to Motor Amarillo Motorreductor Hobby (first motor) vcc
• OUT2 connected to Motor Amarillo Motorreductor Hobby (first motor) GND
• OUT3 connected to Motor Amarillo Motorreductor Hobby (second motor) GND
• OUT4 connected to Motor Amarillo Motorreductor Hobby (second motor) vcc

HC-05 Bluetooth Module

• VCC connected to Arduino UNO 5V
• GND connected to Arduino UNO GND
• RXD connected to Arduino UNO D1
• TXD connected to Arduino UNO D0

Motor Amarillo Motorreductor Hobby (First Motor)

• vcc connected to L298N DC Motor Driver OUT1
• GND connected to L298N DC Motor Driver OUT2

Motor Amarillo Motorreductor Hobby (Second Motor)

• GND connected to L298N DC Motor Driver OUT3
• vcc connected to L298N DC Motor Driver OUT4

9V Battery

• + connected to L298N DC Motor Driver 12V
• - connected to L298N DC Motor Driver GND

Documented Code

/*
 * Arduino Sketch for Front-Wheel Drive RC Car with Voice Recognition
 *
 * This code controls a front-wheel-drive RC car using voice commands received
 * via the HC-05 Bluetooth module. The Arduino UNO processes the commands and
 * controls the L298N motor driver to drive the motors accordingly.
 */

// Pin definitions
const int IN1 = 8;
const int IN2 = 9;
const int IN3 = 10;
const int IN4 = 11;
const int ENA = 5;
const int ENB = 6;
const int BT_RX = 0;
const int BT_TX = 1;

void setup() {
  // Initialize motor control pins
  pinMode(IN1, OUTPUT);
  pinMode(IN2, OUTPUT);
  pinMode(IN3, OUTPUT);
  pinMode(IN4, OUTPUT);
  pinMode(ENA, OUTPUT);
  pinMode(ENB, OUTPUT);
  // Initialize Bluetooth communication
  Serial.begin(9600);
}

void loop() {
  // Check if data is available from Bluetooth
  if (Serial.available() > 0) {
    char command = Serial.read();
    // Process the received 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);
  analogWrite(ENA, 255);
  analogWrite(ENB, 255);
}

void moveBackward() {
  digitalWrite(IN1, LOW);
  digitalWrite(IN2, HIGH);
  digitalWrite(IN3, LOW);
  digitalWrite(IN4, HIGH);
  analogWrite(ENA, 255);
  analogWrite(ENB, 255);
}

void turnLeft() {
  digitalWrite(IN1, LOW);
  digitalWrite(IN2, HIGH);
  digitalWrite(IN3, HIGH);
  digitalWrite(IN4, LOW);
  analogWrite(ENA, 255);
  analogWrite(ENB, 255);
}

void turnRight() {
  digitalWrite(IN1, HIGH);
  digitalWrite(IN2, LOW);
  digitalWrite(IN3, LOW);
  digitalWrite(IN4, HIGH);
  analogWrite(ENA, 255);
  analogWrite(ENB, 255);
}

void stopCar() {
  digitalWrite(IN1, LOW);
  digitalWrite(IN2, LOW);
  digitalWrite(IN3, LOW);
  digitalWrite(IN4, LOW);
  analogWrite(ENA, 0);
  analogWrite(ENB, 0);
}

This code is responsible for interpreting the commands received from the HC-05 Bluetooth module and controlling the motors through the L298N motor driver. The commands are single characters that represent different actions for the RC car: 'F' for forward, 'B' for backward, 'L' for left turn, 'R' for right turn, and 'S' for stop. The moveForward, moveBackward, turnLeft, turnRight, and stopCar functions are used to control the motor driver's inputs and enable pins to achieve the desired motion.