Greenhouse Automation

1//Libraries included
2#include <LiquidCrystal.h>
3#include <Adafruit_Sensor.h>
4#include  <DHT.h>
5#include <DHT_U.h>
6
7//LCD digital pins connection
8LiquidCrystal  lcd(12, 11, 5, 4, 3, 2);
9//DHT11 digital pins connection and dht sensor type
10#define  DHTPIN 13
11#define DHTTYPE DHT11
12DHT dht(DHTPIN, DHTTYPE);
13//4Relay module  digital pins connection
14#define PIN_RELAY_1 7   // the Arduino digital pin 7  - IN1 pin of relay module
15#define PIN_RELAY_2 8   // the Arduino digitall pin  8- IN2 pin of relay module
16#define PIN_RELAY_3 9   // the Arduino digital pin  9 - IN3 pin of relay module
17#define PIN_RELAY_4 10  // the Arduino digital pin  10 - IN4 pin of relay module
18//define soil moisture sensor analog pin A0
19const  int Soil_Pin = A0;
20const int Ldr_pin = A1;
21
22void setup() {
23  Serial.begin(9600);
24  lcd.begin(16, 2);  // initialize the LCD
25  dht.begin();       // initialize  the dht sensor
26  // initialize digital pins as an output.
27  pinMode(PIN_RELAY_1,  OUTPUT);
28  pinMode(PIN_RELAY_2, OUTPUT);
29  pinMode(PIN_RELAY_3, OUTPUT);
30  pinMode(PIN_RELAY_4, OUTPUT);
31  //ldr read as input
32  pinMode(Ldr_pin, INPUT);
33}
34
35void  loop() {
36  // wait between measurements.(500ms = 0.5 Second)
37  delay(500);
38  float temperature = dht.readTemperature();  // read temperature in Celsius  //  temperature in Celsius
39  float humidity = dht.readHumidity(); //read humidity  //humidity declaration
40
41  //ldr read as analog
42  int ldr_Value = analogRead(Ldr_pin);  
43
44  //soil sensor data in percentage
45  float moisture_percentage;
46  int  sensor_analog;
47  sensor_analog = analogRead(Soil_Pin);
48  moisture_percentage  = (100 - ((sensor_analog / 1023.00) * 100));
49  
50// Plot live data in the Arduino  ide serial plotter 
51  Serial.print(moisture_percentage);
52  Serial.print("  "); // a space ' ' or  tab '\	' character is printed between the two values.
53  Serial.print(temperature);
54  Serial.print(" "); // a space ' ' or  tab '\	'  character is printed between the two values.
55  Serial.println(humidity); 
56  Serial.print(" "); // a space ' ' or  tab '\	' character is printed between  the two values.  
57//  lcd screen display order
58  lcd.setCursor(0, 0);
59  lcd.print("M %");
60  lcd.setCursor(0, 1);  
61  lcd.print(moisture_percentage);
62  lcd.setCursor(6, 0); 
63  lcd.print("Tc");
64  lcd.print((char)223);//shows  degrees character  
65  lcd.setCursor(6, 1);
66  lcd.print(temperature);
67  lcd.setCursor(12,  0);
68  lcd.print("H %");
69  lcd.setCursor(12, 1);
70  lcd.print(humidity);
71//  Conditional statment to control the relays (Greenhouse systems)
72
73  if (moisture_percentage  < 60.00){
74    digitalWrite(PIN_RELAY_1, LOW);    // turn in1 ON 
75  } else  {
76     digitalWrite(PIN_RELAY_1, HIGH);  // turn in1 OFF 
77  } 
78  if (temperature  < 20) {
79    digitalWrite(PIN_RELAY_2, LOW);    // turn in2 ON
80  } else {
81     digitalWrite(PIN_RELAY_2, HIGH);  // turn in2 OFF
82  }
83  if (temperature  > 30) {
84    digitalWrite(PIN_RELAY_3, LOW);    // turn in3 ON
85  } else { 
86      digitalWrite(PIN_RELAY_3, HIGH); // turn in3 OFF
87  }
88  if (ldr_Value  < 300) {
89    digitalWrite(PIN_RELAY_4, LOW);    // turn in4 ON
90  } else {
91    digitalWrite(PIN_RELAY_4, HIGH);   // turn in4 OFF
92  }
93 
94  delay(2000);  // wait after loop for 2 Seconds  
95
96}