How to merge three scetches?

Projects Programming
2

you start with one of the sketches and

  1. merge global variables,
  2. merge functions
  3. merge includes
  4. merge the setup() code
  5. merge the loop code()

in every merge step you should resolve conflicting names, #parameters etc.

do that for every additional sketch.
So step one would lead to - note there are some conflicts to resolve!

// set pin numbers:
const int soundPin = 2;     // the number of the Sound sensor pin
const int ledPin =  13;      // the number of the LED pin

// These constants won't change.  They're used to give names
// to the pins used:
const int analogInPin = A0;  // Analog input pin that the potentiometer is attached to
const int ledPin = 13;                 // LED connected to digital pin 13


const int lightPin = 2;
const int ledPin =  13;
int value = 0;

int sensorValue = 0;        // value read from the sensor
// variables will change:
int soundState = 0;         // variable for reading the sound sensor status

void setup() {
  // initialize the LED pin as an output:
  pinMode(ledPin, OUTPUT);      
  // initialize the sound sensor pin as an input:
  pinMode(soundPin, INPUT);     
}

void loop(){
  // read the state of the sound sensor value:
soundState = digitalRead(soundPin);
  
  // check if any sound is detected.
  // if it is, the sound sensor is :PW:
  if (soundState == LOW) {     
    // turn LED on:    
    digitalWrite(ledPin, HIGH);  
    delay(60000);
    //wait 60 seconds and turn it off
    digitalWrite(ledPin, LOW);  
  } 
  else {
    // turn LED off:
    digitalWrite(ledPin, LOW); 
  }
}