#include <LiquidCrystal.h> // include the LiquidCrystal library

const int micPin1 = A0; // define the pin for the first microphone

const int buzzerPin = 9; // define the pin for the buzzer
const int ledPin = 6; // define the pin for the LED
const int contrast = 50; // define the LCD contrast
LiquidCrystal lcd(12, 11, 5, 4, 3, 2); // initialize the LCD display

void setup() {
  pinMode(buzzerPin, OUTPUT); // set the buzzer pin as output
  pinMode(ledPin, OUTPUT); // set the LED pin as output
  lcd.begin(16, 2); // initialize the LCD display
  analogWrite(6,contrast); // set the LCD contrast
  Serial.begin(9600); // initialize the serial monitor
}

void loop() {
  // read the values from the microphones
  int micValue1 = analogRead(micPin1);
  
  // calculate the sound levels in dB for each microphone
  float voltage1 = micValue1 * 5.0 / 1024.0; // convert the first microphone value to voltage (5V reference)
  float voltage2 = micValue1 * 5.0 / 1024.0; // convert the second microphone value to voltage (5V reference)
  float voltage3 = micValue1 * 5.0 / 1024.0; // convert the third microphone value to voltage (5V reference)
  float dB1 = 20 * log10(voltage1/0.0063); // calculate the sound level in dB for the first microphone
  float dB2 = 20 * log10(voltage2/0.0063); // calculate the sound level in dB for the second microphone
  float dB3 = 20 * log10(voltage3/0.0063); // calculate the sound level in dB for the third microphone
  
  // calculate the average sound level in dB for all microphones
  float averageDB = (dB1 + dB2 + dB3) / 3;
  
  // display the sound level on the LCD display and the serial monitor
  lcd.setCursor(0, 0); // set the cursor to the first row of the LCD display
  lcd.print("Sound Level: "); // print the text "Sound Level: " on the LCD display
  lcd.setCursor(0, 1); // set the cursor to the second row of the LCD display
  lcd.print(averageDB); // print the average sound level on the LCD display
  Serial.print("Sound Level: "); // print the text "Sound Level: " on the serial monitor
  Serial.println(averageDB); // print the average sound level on the serial monitor
  
  // control the LED and the buzzer based on the sound level
  if (averageDB > 50) { // if the sound level is higher than 70 dB
    digitalWrite(ledPin, HIGH); // turn the LED on
    tone(buzzerPin, 1000, 500); // turn the buzzer on
  } else { // if the sound level is lower than 70 dB
    digitalWrite;
  }
}