Temperature Controlled Fan

1// Ramji Patel376 //
2// Arduino.cc //
3
4#include <LiquidCrystal.h>
5LiquidCrystal  lcd(5,6,7,8,9,10);
6
7int tempPin = A4; // the output pin of LM35
8int fan  = 3; // the pin where fan is
9int led = 12; // led pin
10int temp;
11int tempMin  = 30;          // the temperature to start the fan 0%
12int tempMax = 60;         //  the maximum temperature when fan is at 100%
13int fanSpeed;
14int fanLCD;
15int  buzzer = 13;
16 
17void setup() {
18pinMode(fan, OUTPUT);
19pinMode(led, OUTPUT);
20pinMode(tempPin,  INPUT);
21lcd.begin(16,2);
22Serial.begin(9600);
23}
24 
25void loop()
26{
27temp  = readTemp();            // get the temperature
28Serial.print( temp );
29if(temp  < tempMin)           // if temp is lower than minimum temp
30{
31fanSpeed = 0;               // fan is not spinning
32analogWrite(fan, fanSpeed);
33fanLCD=0;
34digitalWrite(fan,  LOW);
35}
36if((temp >= tempMin) && (temp <= tempMax))         // if temperature  is higher than minimum temp
37{
38fanSpeed = temp;//map(temp, tempMin, tempMax,  0, 100);       // the actual speed of fan//map(temp, tempMin, tempMax, 32, 255);
39fanSpeed=1.5*fanSpeed;
40fanLCD  = map(temp, tempMin, tempMax, 0, 100);          // speed of fan to display on LCD100
41analogWrite(fan,  fanSpeed);            // spin the fan at the fanSpeed speed
42}
43 
44if(temp  > tempMax)          // if temp is higher than tempMax
45{
46digitalWrite(led,  HIGH);     // turn on led
47}
48else // else turn of led
49{
50digitalWrite(led,  LOW);
51}
52lcd.setCursor(0,0);
53lcd.print("TEMP: ");
54lcd.print(temp);          // display the temperature
55lcd.print("C ");
56lcd.setCursor(0,1);      // move cursor to next line
57lcd.print("FANS: ");
58lcd.print(fanLCD);      // display the fan speed
59lcd.print("%");
60
61}
62 
63int readTemp()  {
64  // get the temperature and convert it to celsius
65temp = analogRead(tempPin);
66return  temp * 0.48828125;
67}

1// Ramji Patel376 //
2// Arduino.cc //
3
4#include <LiquidCrystal.h>
5LiquidCrystal
6  lcd(5,6,7,8,9,10);
7
8int tempPin = A4; // the output pin of LM35
9int fan
10  = 3; // the pin where fan is
11int led = 12; // led pin
12int temp;
13int tempMin
14  = 30;          // the temperature to start the fan 0%
15int tempMax = 60;         //
16  the maximum temperature when fan is at 100%
17int fanSpeed;
18int fanLCD;
19int
20  buzzer = 13;
21 
22void setup() {
23pinMode(fan, OUTPUT);
24pinMode(led, OUTPUT);
25pinMode(tempPin,
26  INPUT);
27lcd.begin(16,2);
28Serial.begin(9600);
29}
30 
31void loop()
32{
33temp
34  = readTemp();            // get the temperature
35Serial.print( temp );
36if(temp
37  < tempMin)           // if temp is lower than minimum temp
38{
39fanSpeed = 0;
40               // fan is not spinning
41analogWrite(fan, fanSpeed);
42fanLCD=0;
43digitalWrite(fan,
44  LOW);
45}
46if((temp >= tempMin) && (temp <= tempMax))         // if temperature
47  is higher than minimum temp
48{
49fanSpeed = temp;//map(temp, tempMin, tempMax,
50  0, 100);       // the actual speed of fan//map(temp, tempMin, tempMax, 32, 255);
51fanSpeed=1.5*fanSpeed;
52fanLCD
53  = map(temp, tempMin, tempMax, 0, 100);          // speed of fan to display on LCD100
54analogWrite(fan,
55  fanSpeed);            // spin the fan at the fanSpeed speed
56}
57 
58if(temp
59  > tempMax)          // if temp is higher than tempMax
60{
61digitalWrite(led,
62  HIGH);     // turn on led
63}
64else // else turn of led
65{
66digitalWrite(led,
67  LOW);
68}
69lcd.setCursor(0,0);
70lcd.print("TEMP: ");
71lcd.print(temp);
72          // display the temperature
73lcd.print("C ");
74lcd.setCursor(0,1);
75      // move cursor to next line
76lcd.print("FANS: ");
77lcd.print(fanLCD);
78      // display the fan speed
79lcd.print("%");
80
81}
82 
83int readTemp()
84  {
85  // get the temperature and convert it to celsius
86temp = analogRead(tempPin);
87return
88  temp * 0.48828125;
89}