Temperature and Distance Buzzer LED

const int trigPin=7;
const int echoPin=9;
long Duration;
int Distance;
int sensor=11;
int sensor_value;
float temp;
int tempPin=0;

void setup() {
  
  pinMode(2,OUTPUT);
  pinMode(trigPin,OUTPUT);
  pinMode(echoPin,INPUT);
  pinMode(3,OUTPUT);
  pinMode(4,OUTPUT);  
  Serial.begin(9600);
  


}

void loop() 
{
  temp=analogRead(tempPin);
  temp=temp*0.48828125;
  Serial.print("TEMPERATURE= ");
  Serial.print(temp);
  Serial.print("*C");
  Serial.println();
   if(sensor_value==0)
  {
  digitalWrite(trigPin,LOW);
  delayMicroseconds(2000);
    digitalWrite(trigPin,HIGH);
  delayMicroseconds(10000);
 digitalWrite(trigPin,LOW);
  Duration=pulseIn(echoPin,HIGH);
  Distance=Duration*0.034/2;
   Serial.print("Distance: ");
  Serial.println(Distance);
  Serial.print("motion detected"); 
  
  
  }
 if(Distance<20)
  {
    digitalWrite(3,LOW);
    digitalWrite(4,HIGH);
    delay(5);

  Serial.print("TEMPERATURE= ");
  Serial.print(temp);
  Serial.print("*C");
  Serial.println();
  }
  
  if(Distance>21)
   {
    digitalWrite(4,LOW);
    digitalWrite(3,HIGH);
    Serial.print("TEMPERATURE= ");
  Serial.print(temp);
  Serial.print("*C");
  Serial.println();
   }
}