Voice-Controlled Car Using ESP32

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Voice-Controlled Car Using ESP32

Untitled design (11).png

This project demonstrates how to build a voice-controlled car using an ESP32 microcontroller and a smartphone app. The car responds to voice commands sent via Bluetooth and is programmed using the Arduino IDE. This is a great project for those interested in IoT and robotics.

Supplies

Components and Supplies


Immagine

4WD Car Chassis Kit - BUY NOW


ESP32 Module - BUY NOW


L298N Motor Driver Module - BUY NOW



Jumper-Wires - BUY NOW



7-12 V DC Battery (in our case lipo 2s battery)

Circuit Connections

Voice Controlled Car.png

ESP32 to Motor Driver (L298N):


Motor A (Front Left & Rear Left Wheels) → L298N OUT1 & OUT2

Motor B (Front Right & Rear Right Wheels) → L298N OUT3 & OUT4

L298N IN1 & IN2 → GPIO Pins 16 & 17 (ESP32)

L298N IN3 & IN4 → GPIO Pins 18 & 19 (ESP32)

L298N VCC → 7-12V DC Battery

L298N GND → Common GND with ESP32

L298N 5V Output → 5V (ESP32)

Upload the Code


Use the Arduino IDE to program the ESP32. Ensure you install the ESP32 board support package and the "BlynkESP32" library before uploading the code. The key components of the code include:

Defining motor control pins

Setting PWM frequency and channels

Handling Bluetooth commands from the Blynk app

Implementing functions like controlWithVoice() for voice recognition and rotateMotor() for movement control


CODE


#define IN2 17
#define IN3 18
#define IN4 19
#define ENA 5
#define ENB 6
#include <BlynkSimpleEsp32_BT.h>

char auth[] = "YourAuthToken";

void setup() {
pinMode(IN1, OUTPUT);
pinMode(IN2, OUTPUT);
pinMode(IN3, OUTPUT);
pinMode(IN4, OUTPUT);
pinMode(ENA, OUTPUT);
pinMode(ENB, OUTPUT);
Blynk.begin(auth);
}

void loop() {
Blynk.run();
}

BLYNK_WRITE(V1) {
String command = param.asStr();
if (command == "forward") {
moveForward();
} else if (command == "backward") {
moveBackward();
} else if (command == "left") {
turnLeft();
} else if (command == "right") {
turnRight();
} else if (command == "stop") {
stopMotors();
}
}

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 stopMotors() {
digitalWrite(IN1, LOW);
digitalWrite(IN2, LOW);
digitalWrite(IN3, LOW);
digitalWrite(IN4, LOW);
}


Setting Up the Blynk App


Download and install the Blynk app on Android/iOS.

Create a new project and select ESP32 as the board.

Add a Bluetooth Widget and connect it to the ESP32 (advertised as "My Voice Car").

Use the app’s voice control feature to send commands like:

"Forward"

"Backward"

"Left"

"Right"

"Stop"

"Speed [number]"

"Dance" (executes a pre-programmed movement sequence)

Step 4: Testing and Calibration

Untitled design (19).png


Ensure the car connects to Bluetooth before testing.

Adjust the motor speed and direction in the code if needed.

Verify the battery voltage for smooth operation.