Automatic Fan with PIR Sensor and LM35 Sensor

#include <avr/io.h>

//the time when the sensor outputs a low impulse
long unsigned int lowIn;        

//the amount of milliseconds the sensor has to be low
//before we assume all motion has stopped
long unsigned int pause = 500; 

boolean lockLow = true;
boolean takeLowTime; 

const int pSuhu = A0; //inisialisasi pin to control LM35 pin A0
float suhu, outputlm, adc; //tipe data yang memungkinkan memuat angka desimal
int pirPin = 12;            //digital pin connected to the PIR's output
int pirPos = 13;           //connects to the PIR's 5V pin
int kipas = 3;

void setup(){
  Serial.begin(9600);    //begins serial communication
  pinMode(pirPin, INPUT);
  pinMode(pirPos, OUTPUT);
  pinMode(kipas,OUTPUT);
  digitalWrite(pirPos, HIGH);
  pinMode(pSuhu, INPUT); // set pSuhu(LM35) to be INPUT

  while (digitalRead(pirPin) == HIGH) {
    delay(500);
    Serial.print(".");     
  }
  Serial.println("SENSOR ACTIVE");
}
void lm35(){
  adc = analogRead(pSuhu); //save nilai from LM35 to variabel nilaiLM35
  suhu = adc / 2.0479;
  outputlm=adc*4.883;
  if (suhu >= 25)
  {
    analogWrite(kipas,50);
    Serial.println("Kecepatan=50");
  }
  if (suhu >= 30)
   {
    analogWrite(kipas,100); 
    Serial.println("Kecepatan=100");
  }
  if (suhu >= 35)
   {
    analogWrite(kipas,150); 
    Serial.println("Kecepatan=150");
  }
  if (suhu >= 40)
   {
    analogWrite(kipas,200); 
    Serial.println("Kecepatan=200");
  }
  if (suhu >= 45)
   {
    analogWrite(kipas,255); 
    Serial.println("Kecepatan=255");
  }  
 }
void loop(){
  if(digitalRead(pirPin) == HIGH){  //if the PIR output is HIGH, turn servo
    lm35();
    if(lockLow){ 
      //makes sure we wait for a transition to LOW before further output is made
      lockLow = false;           
      Serial.println("---");
      Serial.print("motion detected at ");
      Serial.print(millis()/1000);
      Serial.println(" sec");
      delay(50);
    }        
    takeLowTime = true;
  }

  if(digitalRead(pirPin) == LOW){      
    digitalWrite(kipas,LOW);
    if(takeLowTime){
      lowIn = millis();             //save the time of the transition from HIGH to LOW
      takeLowTime = false;    //make sure this is only done at the start of a LOW phase
    }
   
    //if the sensor is low for more than the given pause,
    //we can assume the motion has stopped
    if(!lockLow && millis() - lowIn > pause){
      //makes sure this block of code is only executed again after
      //a new motion sequence has been detected
      lockLow = true;                       
      Serial.print("motion ended at "); //output
      Serial.print((millis() - pause)/1000);
      Serial.println(" sec");
      delay(50);
    }
  }
  delay(1000);
  Serial.print(", Suhu: ");
  Serial.print(suhu);
  Serial.println(); //send data ASCII + CR,LF (kode enter)
  delay(1000); 
  Serial.print(", ADC: ");
  Serial.print(adc);
  Serial.println(); //send data ASCII + CR,LF (kode enter)
  delay(1000); 
}