Overview
Things
Story

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
Step 1: Circuit Connections
ESP32 to Motor Driver (L298N)
Step 2: Upload the Code
Step 3: Setting Up the Blynk App
Step 4: Testing and Calibration

Published March 28, 2025

Voice-Controlled Car Using ESP32

This project demonstrates how to build a voice-controlled car using an ESP32 microcontroller and a smartphone app.

BeginnerProtip1 hour101

Things used in this project

Hardware components

4WD Car Chassis Kit

ESP32 Module

L298N Motor Driver Module

Jumper wires

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

Story

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.

Step 1: Circuit Connections

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)

Step 2: 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

Step 3: 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

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.

Code

#define IN1 16
#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);
}

Voice-Controlled Car Using ESP32

Things used in this project

Hardware components

Story

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.

Step 1: Circuit Connections

ESP32 to Motor Driver (L298N):

Step 2: Upload the Code

Step 3: Setting Up the Blynk App

Step 4: Testing and Calibration

Code

Code

Credits

Webdroid Edutech

Comments

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Voice-Controlled Car Using ESP32

Voice-Controlled Car Using ESP32

Things used in this project

Hardware components

Story

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.

Step 1: Circuit Connections

ESP32 to Motor Driver (L298N):

Step 2: Upload the Code

Step 3: Setting Up the Blynk App

Step 4: Testing and Calibration

Code

Code

Credits

Webdroid Edutech

Comments

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