int temp2 = A0;
int temp3 = A2;
int egr1 = A4;
int rled0 = 11; 
int piezo = 9;
int gnd = 8;
int dpf = 182;
int cat = 183;
int egr = 200;
int tempcat = 500;
int tempdpf = 500;
int gled = 7;

void setup(){
   Serial.begin(9600);
   pinMode(egr, INPUT);
   pinMode(temp2, INPUT);
   pinMode(temp3, INPUT);
   pinMode(rled0, OUTPUT);
   pinMode(gled, OUTPUT);
   pinMode(piezo, OUTPUT);
   pinMode(gnd, OUTPUT);
   digitalWrite(gnd, LOW);
   digitalWrite(rled0, LOW);
   digitalWrite(gled, LOW);
   digitalWrite(piezo, LOW);
   digitalWrite(rled0, HIGH);  
   delay(3000);             
   digitalWrite(piezo, HIGH);  
   delay(100);             
   digitalWrite(piezo, LOW);   
   delay(200);
   digitalWrite(piezo, HIGH);  
   delay(100);             
   digitalWrite(piezo, LOW);
   digitalWrite(rled0, LOW);
   delay(5000);
   
               
 } 
  
 void loop(){
   
   Serial.print("CAT temp sensor 2 : ");
   Serial.println(analogRead(temp2));
   Serial.print("DPF temp sensor 3 : ");
   Serial.println(analogRead(temp3));
   Serial.print("EGR position      : ");
   Serial.println(analogRead(egr1));
   Serial.print("RED LED illu      : ");
   Serial.println(digitalRead(rled0));
   Serial.print("\n");
   delay(800);
   digitalWrite(gled, LOW);

   

   if(analogRead(temp2) < (tempcat)){		
        digitalWrite(gled, HIGH); 
        
   if(analogRead(temp2) > (tempcat)){	     
        digitalWrite(gled, LOW);
         }  } 




   if(analogRead(egr1) < (egr)){
   if(analogRead(temp2) < (cat)){		
   if(analogRead(temp3) < (dpf)){	
     digitalWrite(gled, LOW);
     delay(500);
     digitalWrite(rled0, HIGH);
     digitalWrite(piezo, HIGH);
     delay(250);
     digitalWrite(piezo, LOW);
     delay(150);
     digitalWrite(piezo, HIGH);
     delay(250);
     digitalWrite(piezo, LOW);
     delay(15000);
     
    } } } 
          
     else{     
     digitalWrite(piezo, LOW);
     digitalWrite(rled0, LOW);
     if(analogRead(temp3) < (tempdpf)){		
        digitalWrite(gled, HIGH); 
        
       } 
    
     }

  

}