How to merge three scetches?

hello guys! have several working scetches want merge one. first 1 turns on led when sound detected, second 1 turns on led when light detected , third 1 turns on led when gas detected. can me how merge them?


// set pin numbers:
const int soundpin = 2;     // number of sound sensor pin
const int ledpin =  13;      // number of led pin

// variables change:
int soundstate = 0;         // variable reading sound sensor status

void setup() {
  // initialize led pin output:
  pinmode(ledpin, output);     
  // initialize sound sensor pin input:
  pinmode(soundpin, input);     
}

void loop(){
  // read state of sound sensor value:
soundstate = digitalread(soundpin);
 
  // check if sound detected.
  // if is, sound sensor :pw:
  if (soundstate == low) {     
    // turn led on:   
    digitalwrite(ledpin, high); 
    delay(60000);
    //wait 60 seconds , turn off
    digitalwrite(ledpin, low); 
  }
  else {
    // turn led off:
    digitalwrite(ledpin, low);
  }
}



const int lightpin = 2;
const int ledpin =  13;
int value = 0;
void setup() {
   pinmode(ledpin, output);
   pinmode(lightpin, input);
  serial.begin(9600);
}
void loop() {
  value = digitalread(lightpin);
if (value == high) {     
    // turn led on:   
    digitalwrite(ledpin, high); 
    delay(60000);
    //wait 60 seconds , turn off
    digitalwrite(ledpin, low); 
  }
  else {
    // turn led off:
    digitalwrite(ledpin, low);
  }
}



// these constants won't change.  they're used give names
// pins used:
const int analoginpin = a0;  // analog input pin potentiometer attached to
const int ledpin = 13;                 // led connected digital pin 13

int sensorvalue = 0;        // value read sensor

void setup() {
  // initialize serial communications @ 9600 bps:
  serial.begin(9600);
  pinmode(ledpin, output);      // sets digital pin output
}

void loop() {
  // read analog in value:
  sensorvalue = analogread(analoginpin);           
  // determine alarm status
  if (sensorvalue >= 200)
  {
    digitalwrite(ledpin, high);   // sets led on
   
  }
  else
  {
  digitalwrite(ledpin, low);    // sets led off
  }

  // print results serial monitor:
  serial.print("sensor = " );                       
  serial.println(sensorvalue);     

  // wait 100 milliseconds before next loop
  // analog-to-digital converter settle
  // after last reading:
  delay(100);                     
}

you start 1 of sketches ,

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

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

do every additional sketch.
so step 1 lead - note there conflicts resolve!

code: [select]

// set pin numbers:
const int soundpin = 2;     // number of sound sensor pin
const int ledpin =  13;      // number of led pin

// these constants won't change.  they're used give names
// pins used:
const int analoginpin = a0;  // analog input pin potentiometer attached to
const int ledpin = 13;                 // led connected digital pin 13


const int lightpin = 2;
const int ledpin =  13;
int value = 0;

int sensorvalue = 0;        // value read sensor
// variables change:
int soundstate = 0;         // variable reading sound sensor status

void setup() {
  // initialize led pin output:
  pinmode(ledpin, output);     
  // initialize sound sensor pin input:
  pinmode(soundpin, input);     
}

void loop(){
  // read state of sound sensor value:
soundstate = digitalread(soundpin);
 
  // check if sound detected.
  // if is, sound sensor :pw:
  if (soundstate == low) {     
    // turn led on:   
    digitalwrite(ledpin, high); 
    delay(60000);
    //wait 60 seconds , turn off
    digitalwrite(ledpin, low); 
  }
  else {
    // turn led off:
    digitalwrite(ledpin, low);
  }
}


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