Automatic Fan with PIR Sensor and LM35 Sensor

1#include <avr/io.h>
2
3//the time when the sensor outputs a low impulse
4long  unsigned int lowIn;        
5
6//the amount of milliseconds the sensor has to  be low
7//before we assume all motion has stopped
8long unsigned int pause =  500; 
9
10boolean lockLow = true;
11boolean takeLowTime; 
12
13const int pSuhu  = A0; //inisialisasi pin to control LM35 pin A0
14float suhu, outputlm, adc; //tipe  data yang memungkinkan memuat angka desimal
15int pirPin = 12;            //digital  pin connected to the PIR's output
16int pirPos = 13;           //connects to the  PIR's 5V pin
17int kipas = 3;
18
19void setup(){
20  Serial.begin(9600);    //begins  serial communication
21  pinMode(pirPin, INPUT);
22  pinMode(pirPos, OUTPUT);
23  pinMode(kipas,OUTPUT);
24  digitalWrite(pirPos, HIGH);
25  pinMode(pSuhu, INPUT);  // set pSuhu(LM35) to be INPUT
26
27  while (digitalRead(pirPin) == HIGH) {
28    delay(500);
29    Serial.print(".");     
30  }
31  Serial.println("SENSOR  ACTIVE");
32}
33void lm35(){
34  adc = analogRead(pSuhu); //save nilai from  LM35 to variabel nilaiLM35
35  suhu = adc / 2.0479;
36  outputlm=adc*4.883;
37  if (suhu >= 25)
38  {
39    analogWrite(kipas,50);
40    Serial.println("Kecepatan=50");
41  }
42  if (suhu >= 30)
43   {
44    analogWrite(kipas,100); 
45    Serial.println("Kecepatan=100");
46  }
47  if (suhu >= 35)
48   {
49    analogWrite(kipas,150); 
50    Serial.println("Kecepatan=150");
51  }
52  if (suhu >= 40)
53   {
54    analogWrite(kipas,200); 
55    Serial.println("Kecepatan=200");
56  }
57  if (suhu >= 45)
58   {
59    analogWrite(kipas,255); 
60    Serial.println("Kecepatan=255");
61  }  
62 }
63void loop(){
64  if(digitalRead(pirPin) == HIGH){  //if the PIR  output is HIGH, turn servo
65    lm35();
66    if(lockLow){ 
67      //makes  sure we wait for a transition to LOW before further output is made
68      lockLow  = false;           
69      Serial.println("---");
70      Serial.print("motion  detected at ");
71      Serial.print(millis()/1000);
72      Serial.println("  sec");
73      delay(50);
74    }        
75    takeLowTime = true;
76  }
77
78  if(digitalRead(pirPin) == LOW){      
79    digitalWrite(kipas,LOW);
80    if(takeLowTime){
81      lowIn = millis();             //save the time of the transition from HIGH  to LOW
82      takeLowTime = false;    //make sure this is only done at the start  of a LOW phase
83    }
84   
85    //if the sensor is low for more than the given  pause,
86    //we can assume the motion has stopped
87    if(!lockLow && millis()  - lowIn > pause){
88      //makes sure this block of code is only executed again  after
89      //a new motion sequence has been detected
90      lockLow = true;                       
91      Serial.print("motion ended at "); //output
92      Serial.print((millis() - pause)/1000);
93      Serial.println(" sec");
94      delay(50);
95    }
96  }
97  delay(1000);
98  Serial.print(", Suhu: ");
99  Serial.print(suhu);
100  Serial.println(); //send data ASCII + CR,LF (kode enter)
101  delay(1000); 
102  Serial.print(", ADC: ");
103  Serial.print(adc);
104  Serial.println();  //send data ASCII + CR,LF (kode enter)
105  delay(1000); 
106}
107