Project Work

 Project Work

char data;
int led = 8;
void setup() {
  pinMode(led, OUTPUT);
  Serial.begin(9600);
}
void loop() {
  if (Serial.available()) {
    data = Serial.read();
    if (data == '1') {        // Voice app se ON ke liye 1 bheje
      digitalWrite(led, HIGH);
    }
    else if (data == '0') {   // OFF ke liye 0 bheje
      digitalWrite(led, LOW);
    }
  }
}


Hi and Bye code

String data = "";

int led = 8;


void setup() {

  pinMode(led, OUTPUT);

  Serial.begin(9600);

}


void loop() {

  while (Serial.available()) {

    char c = Serial.read();

    data += c;

    delay(5);

  }


  if (data.length() > 0) {

    data.trim();   // extra space remove


    if (data == "hi") {

      digitalWrite(led, HIGH);

    }

    else if (data == "bye") {

      digitalWrite(led, LOW);

    }


    data = "";   // reset

  }

}

HI and BYE code    Hi -ON, Bye -Off


String data = "";
int led = 8;

void setup() {
  pinMode(led, OUTPUT);
  Serial.begin(9600);
}

void loop() {
  while (Serial.available()) {
    char c = Serial.read();
    data += c;
    delay(5);
  }

  if (data.length() > 0) {
    data.trim();   // extra space remove

    if (data == "hi") {
      digitalWrite(led, HIGH);
    }
    else if (data == "bye") {
      digitalWrite(led, LOW);
    }

    data = "";  // reset
  }
}


Voice control Robot:- 
  

 Components Needed:

  • Arduino Uno (or Nano)

  • L298N Motor Driver

  • 2 DC Motors + Wheels

  • Robot chassis

  • HC-05 Bluetooth module

  • Jumper wires

  • Battery (7–12V)

  • Android phone

🧠 How It Works

  1. You speak into your phone.

  2. A voice control app converts speech → text.

  3. The app sends command via Bluetooth.

  4. Arduino receives command.

  5. Motors move accordingly.

🔌 Wiring Overview

1️⃣ Bluetooth (HC-05)

  • VCC → 5V

  • GND → GND

  • TX → Arduino RX

  • RX → Arduino TX (use voltage divider)

2️⃣ Motor Driver (L298N)

  • IN1 → Arduino pin 8

  • IN2 → Arduino pin 9

  • IN3 → Arduino pin 10

  • IN4 → Arduino pin 11

  • Motors connected to OUT1, OUT2

  • Battery to 12V input


Coding :-  

char command;

void setup() {
  Serial.begin(9600);
  pinMode(8, OUTPUT);
  pinMode(9, OUTPUT);
  pinMode(10, OUTPUT);
  pinMode(11, OUTPUT);
}
void loop() {
  if (Serial.available()) {
    command = Serial.read();
    if (command == 'F') {      // Forward
      digitalWrite(8, HIGH);
      digitalWrite(9, LOW);
      digitalWrite(10, HIGH);
      digitalWrite(11, LOW);
    }
    else if (command == 'B') { // Backward
      digitalWrite(8, LOW);
      digitalWrite(9, HIGH);
      digitalWrite(10, LOW);
      digitalWrite(11, HIGH);
    }
    else if (command == 'L') { // Left
      digitalWrite(8, LOW);
      digitalWrite(9, HIGH);
      digitalWrite(10, HIGH);
      digitalWrite(11, LOW);
    }
    else if (command == 'R') { // Right
      digitalWrite(8, HIGH);
      digitalWrite(9, LOW);
      digitalWrite(10, LOW);
      digitalWrite(11, HIGH);
    }
    else if (command == 'S') { // Stop
      digitalWrite(8, LOW);
      digitalWrite(9, LOW);
      digitalWrite(10, LOW);
      digitalWrite(11, LOW);
    }
  }
}

Simple Talking Robot

Components:

  • Arduino (Uno/Nano)

  • DFPlayer Mini (MP3 module)

  • Micro SD card

  • Speaker (3W)

  • Push button (optional)

  • Battery

 How It Works

  • You store MP3 voice files on SD card.

  • Arduino tells DFPlayer which file to play.

  • Robot speaks through speaker.

Example Audio Files

On SD card:

  • 0001.mp3 → “Hello, I am your robot.”

  • 0002.mp3 → “How are you?”

  • 0003.mp3 → “Nice to meet you.”


#include "SoftwareSerial.h"
#include "DFRobotDFPlayerMini.h"

SoftwareSerial mySerial(10, 11);
DFRobotDFPlayerMini myDFPlayer;

void setup() {
  mySerial.begin(9600);
  Serial.begin(9600);

  if (!myDFPlayer.begin(mySerial)) {
    while(true);
  }

  myDFPlayer.volume(20);  // Set volume (0-30)
  myDFPlayer.play(1);     // Play 0001.mp3
}

void loop() {
}

 





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