Temperature Controlled Fan with LCD Using Arduino

The Arduino controls the fans speed as per room temperature and also displays temperature on an LCD.

Sep 8, 2019

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Components and supplies

Gravity: Analog LM35 Temperature Sensor For Arduino

Rotary Potentiometer, 10 kohm

Arduino UNO

DC Motor, Miniature

Alphanumeric LCD, 20 x 4

Tools and machines

Breadboard, 270 Pin

Apps and platforms

Arduino IDE

Project description

Code

Temperature controlled FAN program

c_cpp

it varies fan speed as per set temperature

1#include <LiquidCrystal.h>
2# define temp_sensor_pin A0
3# define   ref_pin A1
4#define fan_op_pin 9
5#define red_led 6
6#define green_led 7
7#define   blue_led 8
8#define sound_pin 10
9float temperature;
10int fan_speed = 50;
11//   initialize the library with the numbers of the interface pins
12LiquidCrystal lcd(12,   11, 5, 4, 3, 2);
13
14void setup() 
15{
16    Serial.begin(9600);
17    lcd.begin(16,   4);
18    lcd.clear();
19    lcd.print("set temp:");
20    lcd.setCursor(0,1);
21     lcd.print("cur temp:");
22    pinMode(red_led,OUTPUT);
23    pinMode(green_led,OUTPUT);
24     pinMode(blue_led,OUTPUT);
25    analogWrite(fan_op_pin, fan_speed);
26}
27
28void   loop() 
29  {
30  	int sensor_value,ref_value,max_temp_limit,min_temp_limit;
31   	sensor_value = analogRead(temp_sensor_pin);    // get the sensor reading
32   	ref_value = analogRead(ref_pin); 
33  	ref_value = map(ref_value, 0, 1023,   0, 100);
34  	max_temp_limit = ref_value+5;
35  	min_temp_limit = ref_value-5;
36   	temperature = (5*sensor_value)/10.31;
37  	Serial.print("set temperature   is ");
38  	Serial.println(ref_value);
39   	Serial.print("current temperature   is ");
40  	Serial.println(temperature);
41  	lcd.setCursor(9,0); 
42  	lcd.print(ref_value);
43   	lcd.print("*C"); 
44  	lcd.setCursor(9,1);   // set cursor to 2nd line 1st   column
45  	lcd.print(temperature); // print temperature
46  	lcd.print("*C");    
47  	if(temperature > max_temp_limit) 
48    	  {
49      		lcd.setCursor(0,2);
50       		lcd.print("over temperature");
51      		lcd.setCursor(0,3);
52       		lcd.print("fan speed incr");
53      		if(fan_speed<150) fan_speed   += 20;
54      		analogWrite(fan_op_pin, fan_speed);
55      		digitalWrite(red_led,HIGH);
56       		digitalWrite(green_led,LOW);
57      		digitalWrite(blue_led,LOW);
58       		tone(sound_pin,1245,1000); 
59    	  } 
60   	else if(temperature   < min_temp_limit) 
61    	  {
62      		lcd.setCursor(0,2);
63      		lcd.print("temperature   down");
64      		lcd.setCursor(0,3);
65      		lcd.print("fan speed decr");
66      		if(fan_speed > 50) fan_speed-=20;
67      		analogWrite(fan_op_pin,   fan_speed);
68      		digitalWrite(red_led,LOW);
69      		digitalWrite(green_led,LOW);
70       		digitalWrite(blue_led,HIGH);
71       	tone(sound_pin,1245,1000); 
72       }
73   else if((temperature<max_temp_limit) && (temperature>min_temp_limit))
74     {  
75       lcd.setCursor(0,2);
76       lcd.print("temperature is  ");
77        lcd.setCursor(0,3);
78       lcd.print("within limit  "); 
79       digitalWrite(red_led,LOW);
80       digitalWrite(green_led,HIGH);
81      digitalWrite(blue_led,LOW);
82    }
83   delay(1000);      // 1 sec delay
84}
85

#include <LiquidCrystal.h>
# define temp_sensor_pin A0
# define   ref_pin A1
#define fan_op_pin 9
#define red_led 6
#define green_led 7
#define   blue_led 8
#define sound_pin 10
float temperature;
int fan_speed = 50;
//   initialize the library with the numbers of the interface pins
LiquidCrystal lcd(12,   11, 5, 4, 3, 2);

void setup() 
{
    Serial.begin(9600);
    lcd.begin(16,   4);
    lcd.clear();
    lcd.print("set temp:");
    lcd.setCursor(0,1);
     lcd.print("cur temp:");
    pinMode(red_led,OUTPUT);
    pinMode(green_led,OUTPUT);
     pinMode(blue_led,OUTPUT);
    analogWrite(fan_op_pin, fan_speed);
}

void   loop() 
  {
  	int sensor_value,ref_value,max_temp_limit,min_temp_limit;
   	sensor_value = analogRead(temp_sensor_pin);    // get the sensor reading
   	ref_value = analogRead(ref_pin); 
  	ref_value = map(ref_value, 0, 1023,   0, 100);
  	max_temp_limit = ref_value+5;
  	min_temp_limit = ref_value-5;
   	temperature = (5*sensor_value)/10.31;
  	Serial.print("set temperature   is ");
  	Serial.println(ref_value);
   	Serial.print("current temperature   is ");
  	Serial.println(temperature);
  	lcd.setCursor(9,0); 
  	lcd.print(ref_value);
   	lcd.print("*C"); 
  	lcd.setCursor(9,1);   // set cursor to 2nd line 1st   column
  	lcd.print(temperature); // print temperature
  	lcd.print("*C");    
  	if(temperature > max_temp_limit) 
    	  {
      		lcd.setCursor(0,2);
       		lcd.print("over temperature");
      		lcd.setCursor(0,3);
       		lcd.print("fan speed incr");
      		if(fan_speed<150) fan_speed   += 20;
      		analogWrite(fan_op_pin, fan_speed);
      		digitalWrite(red_led,HIGH);
       		digitalWrite(green_led,LOW);
      		digitalWrite(blue_led,LOW);
       		tone(sound_pin,1245,1000); 
    	  } 
   	else if(temperature   < min_temp_limit) 
    	  {
      		lcd.setCursor(0,2);
      		lcd.print("temperature   down");
      		lcd.setCursor(0,3);
      		lcd.print("fan speed decr");
      		if(fan_speed > 50) fan_speed-=20;
      		analogWrite(fan_op_pin,   fan_speed);
      		digitalWrite(red_led,LOW);
      		digitalWrite(green_led,LOW);
       		digitalWrite(blue_led,HIGH);
       	tone(sound_pin,1245,1000); 
       }
   else if((temperature<max_temp_limit) && (temperature>min_temp_limit))
     {  
       lcd.setCursor(0,2);
       lcd.print("temperature is  ");
        lcd.setCursor(0,3);
       lcd.print("within limit  "); 
       digitalWrite(red_led,LOW);
       digitalWrite(green_led,HIGH);
      digitalWrite(blue_led,LOW);
    }
   delay(1000);      // 1 sec delay
}

Temperature controlled FAN program

c_cpp

it varies fan speed as per set temperature

1#include <LiquidCrystal.h>
2# define temp_sensor_pin A0
3# define  ref_pin A1
4#define fan_op_pin 9
5#define red_led 6
6#define green_led 7
7#define  blue_led 8
8#define sound_pin 10
9float temperature;
10int fan_speed = 50;
11//  initialize the library with the numbers of the interface pins
12LiquidCrystal lcd(12,  11, 5, 4, 3, 2);
13
14void setup() 
15{
16    Serial.begin(9600);
17    lcd.begin(16,  4);
18    lcd.clear();
19    lcd.print("set temp:");
20    lcd.setCursor(0,1);
21    lcd.print("cur temp:");
22    pinMode(red_led,OUTPUT);
23    pinMode(green_led,OUTPUT);
24    pinMode(blue_led,OUTPUT);
25    analogWrite(fan_op_pin, fan_speed);
26}
27
28void  loop() 
29  {
30  	int sensor_value,ref_value,max_temp_limit,min_temp_limit;
31  	sensor_value = analogRead(temp_sensor_pin);    // get the sensor reading
32  	ref_value = analogRead(ref_pin); 
33  	ref_value = map(ref_value, 0, 1023,  0, 100);
34  	max_temp_limit = ref_value+5;
35  	min_temp_limit = ref_value-5;
36  	temperature = (5*sensor_value)/10.31;
37  	Serial.print("set temperature  is ");
38  	Serial.println(ref_value);
39   	Serial.print("current temperature  is ");
40  	Serial.println(temperature);
41  	lcd.setCursor(9,0); 
42  	lcd.print(ref_value);
43  	lcd.print("*C"); 
44  	lcd.setCursor(9,1);   // set cursor to 2nd line 1st  column
45  	lcd.print(temperature); // print temperature
46  	lcd.print("*C");   
47  	if(temperature > max_temp_limit) 
48    	  {
49      		lcd.setCursor(0,2);
50      		lcd.print("over temperature");
51      		lcd.setCursor(0,3);
52      		lcd.print("fan speed incr");
53      		if(fan_speed<150) fan_speed  += 20;
54      		analogWrite(fan_op_pin, fan_speed);
55      		digitalWrite(red_led,HIGH);
56      		digitalWrite(green_led,LOW);
57      		digitalWrite(blue_led,LOW);
58      		tone(sound_pin,1245,1000); 
59    	  } 
60   	else if(temperature  < min_temp_limit) 
61    	  {
62      		lcd.setCursor(0,2);
63      		lcd.print("temperature  down");
64      		lcd.setCursor(0,3);
65      		lcd.print("fan speed decr");
66     		if(fan_speed > 50) fan_speed-=20;
67      		analogWrite(fan_op_pin,  fan_speed);
68      		digitalWrite(red_led,LOW);
69      		digitalWrite(green_led,LOW);
70      		digitalWrite(blue_led,HIGH);
71       	tone(sound_pin,1245,1000); 
72      }
73   else if((temperature<max_temp_limit) && (temperature>min_temp_limit))
74    {  
75       lcd.setCursor(0,2);
76       lcd.print("temperature is  ");
77       lcd.setCursor(0,3);
78       lcd.print("within limit  "); 
79       digitalWrite(red_led,LOW);
80      digitalWrite(green_led,HIGH);
81      digitalWrite(blue_led,LOW);
82    }
83  delay(1000);      // 1 sec delay
84}
85

#include <LiquidCrystal.h>
# define temp_sensor_pin A0
# define  ref_pin A1
#define fan_op_pin 9
#define red_led 6
#define green_led 7
#define  blue_led 8
#define sound_pin 10
float temperature;
int fan_speed = 50;
//  initialize the library with the numbers of the interface pins
LiquidCrystal lcd(12,  11, 5, 4, 3, 2);

void setup() 
{
    Serial.begin(9600);
    lcd.begin(16,  4);
    lcd.clear();
    lcd.print("set temp:");
    lcd.setCursor(0,1);
    lcd.print("cur temp:");
    pinMode(red_led,OUTPUT);
    pinMode(green_led,OUTPUT);
    pinMode(blue_led,OUTPUT);
    analogWrite(fan_op_pin, fan_speed);
}

void  loop() 
  {
  	int sensor_value,ref_value,max_temp_limit,min_temp_limit;
  	sensor_value = analogRead(temp_sensor_pin);    // get the sensor reading
  	ref_value = analogRead(ref_pin); 
  	ref_value = map(ref_value, 0, 1023,  0, 100);
  	max_temp_limit = ref_value+5;
  	min_temp_limit = ref_value-5;
  	temperature = (5*sensor_value)/10.31;
  	Serial.print("set temperature  is ");
  	Serial.println(ref_value);
   	Serial.print("current temperature  is ");
  	Serial.println(temperature);
  	lcd.setCursor(9,0); 
  	lcd.print(ref_value);
  	lcd.print("*C"); 
  	lcd.setCursor(9,1);   // set cursor to 2nd line 1st  column
  	lcd.print(temperature); // print temperature
  	lcd.print("*C");   
  	if(temperature > max_temp_limit) 
    	  {
      		lcd.setCursor(0,2);
      		lcd.print("over temperature");
      		lcd.setCursor(0,3);
      		lcd.print("fan speed incr");
      		if(fan_speed<150) fan_speed  += 20;
      		analogWrite(fan_op_pin, fan_speed);
      		digitalWrite(red_led,HIGH);
      		digitalWrite(green_led,LOW);
      		digitalWrite(blue_led,LOW);
      		tone(sound_pin,1245,1000); 
    	  } 
   	else if(temperature  < min_temp_limit) 
    	  {
      		lcd.setCursor(0,2);
      		lcd.print("temperature  down");
      		lcd.setCursor(0,3);
      		lcd.print("fan speed decr");
     		if(fan_speed > 50) fan_speed-=20;
      		analogWrite(fan_op_pin,  fan_speed);
      		digitalWrite(red_led,LOW);
      		digitalWrite(green_led,LOW);
      		digitalWrite(blue_led,HIGH);
       	tone(sound_pin,1245,1000); 
      }
   else if((temperature<max_temp_limit) && (temperature>min_temp_limit))
    {  
       lcd.setCursor(0,2);
       lcd.print("temperature is  ");
       lcd.setCursor(0,3);
       lcd.print("within limit  "); 
       digitalWrite(red_led,LOW);
      digitalWrite(green_led,HIGH);
      digitalWrite(blue_led,LOW);
    }
  delay(1000);      // 1 sec delay
}

Downloadable files

Arduino based temperature controlled FAN

it controls fan speed as per the room temperature

Arduino based temperature controlled FAN

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