Home Automaton with LDR And DHT22 Sensor Along With Arduino

1/*feel free to contact
2 * sreeramaj53@gmail.com
3 * www.youtube.com/ZenoModiff
4  * last updated - time 11:51am - date 12 may 2021
5 */
6
7#include <Wire.h>  
8#include <LiquidCrystal_I2C.h>
9#include "DHT.h"
10#define DHTPIN 4
11#define  DHTTYPE DHT11
12
13int Light = 11 ;
14int Fan = 12 ;
15const int ldrPin = 3;
16LiquidCrystal_I2C  lcd(0x27, 16, 2);
17DHT dht(DHTPIN, DHTTYPE);
18
19void setup()
20{
21 
22  Serial.begin(9600);
23  Serial.println(F("Home - Automation With DHT22 - LDR  "));
24  
25  dht.begin();
26
27  lcd.begin();
28  lcd.setCursor(0,0);
29  lcd.print("Home");
30  lcd.setCursor(0,3);
31  lcd.print("Automation");
32  delay(2000);
33  lcd.clear();
34  lcd.setCursor(0,0);
35  lcd.print("With");
36  lcd.setCursor(0,3);
37  lcd.print("LDR - DHT22");
38  delay(2000);
39  lcd.clear();
40  lcd.print("By");
41  lcd.setCursor(0,3);
42  lcd.print("Zeno Modiff");
43  delay (3000);
44  lcd.clear();
45  
46  pinMode(Light , OUTPUT);
47  pinMode(Fan  , OUTPUT);
48  pinMode(ldrPin , INPUT);
49  
50}
51
52void loop()
53{
54  
55 float t = dht.readTemperature();
56 float f = dht.readTemperature(true);
57  
58 if (isnan(t) || isnan(f)) {
59 Serial.println(F("Failed to read from DHT  sensor!"));
60 return;
61}
62
63 Serial.print("DHT-Temp: ");Serial.print(t);Serial.println("  c");
64  
65int Ldr_Status = digitalRead(ldrPin);  
66if (Ldr_Status > 0)
67
68{
69
70digitalWrite(Light,  LOW);
71
72Serial.print("Its DARK, Turn on the LED : ");
73lcd.clear();
74lcd.print("Light  Turned ON");
75lcd.setCursor(0,3);
76lcd.print("Temp: ");
77lcd.setCursor(6,7);
78lcd.println(t);
79delay(1000);
80
81Serial.println(Ldr_Status);
82
83}
84else  
85{
86
87digitalWrite(Light, HIGH);
88
89Serial.print("Its DARK, Turn on  the LED : ");
90
91lcd.clear();
92lcd.print("Light Turned OFF");
93lcd.setCursor(0,3);
94lcd.print("Temp:  ");
95lcd.setCursor(6,7);
96lcd.println(t);
97delay(2000);
98
99Serial.print("Its  BRIGHT, Turn off the LED : ");
100
101Serial.println(Ldr_Status);
102
103}
104  if(t>34){          
105    digitalWrite(Fan, LOW);   
106    lcd.clear();
107    lcd.print("Fan  Turned ON");
108    delay(2000);
109   
110    
111  }
112  else 
113  digitalWrite(Fan  , HIGH);
114      lcd.clear();
115      lcd.print("Fan Turned OFF");
116      delay(1000);
117}