Voice-controlled Light Switch

Sometimes, I just don't want to get out of the bed to turn off the light. I've always wished I can just control the lights remotely so that it turns off when I command it to. This project accomplishes just that. It gives users control of any light by using a servo motor to control a light switch. Using a sound detector board as an input, the Arduino can move a servo at a given level of sound such that the light switch is toggled on or off.

• Arduino Uno
• Breadboard
• Sound Detector Board
• Servo Motor
• Jumper Cables

Tape the servo to provide enough counter-moment for the turning motion of the control horn.

//include the servo library

#include 
 //pin variable

const int soundPin = 0;
const int servoPin = 9;
int clap_on = 0;

// declare servo
Servo servo1;

//variables for storing raw sound and scaled value
int sound;

void setup()
{
  Serial.begin(9600);
  
  // attach servo to pin 9
  servo1.attach(servoPin);
  // always initialize the servo as light off.
  servo1.write (180);
  servo1.write (150);
  clap_on = 0;
}

void loop()
{
 //read and store the audio from Envelope pin
 sound = analogRead(soundPin);
 //map sound which in a quiet room a clap is 300
 //from 0 to 3 to be used with switch case

 //print values over the serial port for debugging
 Serial.println(sound);

  if (sound > 20){
    if (clap_on == 0){ // check if the servo still hasnt rotated
      servo1.write(150); // turn light on
      clap_on = 1;}  // set a toggle on clap so then next time it
      //happens it will turn the light off
    else if (clap_on == 1){
      servo1.write(180); // turn light off
      clap_on = 0;}  // set toggle again.
  }
  delay (500);
}

The sound module is actually not analyzing the commands I give it as information, but rather as sound signals only. That is, I can clap, snap, or make any other sound to turn it on or off. In this case, voice control worked perfectly!