Final Project Journal

// LCD

#include <Wire.h>

#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 16, 2);

// DHT

#include "DHT.h"

#define DHTPIN 2       // Digital pin connected to the DHT sensor

#define DHTTYPE DHT11  // DHT 11

DHT dht(DHTPIN, DHTTYPE);

#define Initial 10

// LDR

int ldrPin = A2;  // Pin connected to LDR

// Servos

#include <Servo.h>

Servo myservo1;  // create Servo object to control a servo

Servo myservo2;

int val;  // variable to read the value from the analog pin

void setup() {

  Serial.begin(9600);

  // Initialize the LCD with the number of columns and rows

  lcd.begin(16, 2);

  // Turn on the backlight

  lcd.backlight();

  // DHT Sensor

  Serial.println(F("DHT11 test!"));

  dht.begin();

  // Servos

  myservo1.attach(9);       // attaches the servo on pin 9 to the Servo object

  myservo2.attach(8);       // attaches the servo on pin 8 to the Servo object

  myservo1.write(Initial);  // initial position for servo

  myservo2.write(Initial);  // initial position for servo

}

void loop() {

  delay(2000);  // Wait 2 seconds between measurements

  // LDR (Light Intensity)

  int ldrValue = analogRead(ldrPin);

  float lightLevel = map(ldrValue, 0, 1023, 100, 0);  // Convert to a percentage

  // DHT (Temperature and Humidity)

  float temperature = dht.readTemperature();  // Celsius

  float humidity = dht.readHumidity();        // Percentage

  if (isnan(temperature) || isnan(humidity)) {

    Serial.println(F("Failed to read from DHT sensor!"));

    return;

  }

  // Clear the LCD and display temperature and light level on the first row

  lcd.clear();          // Clear the LCD screen

  lcd.setCursor(0, 1);  // Set cursor to the first row

  lcd.print("T:");

  lcd.print(temperature);

  lcd.print("C L:");

  lcd.print(lightLevel);

  lcd.print("%");

// Determine the status and control the servos accordingly

  String status;

  if (lightLevel > 80 && temperature > 20 && humidity > 20) {

    myservo1.write(170);  // Fully close the servos

    myservo2.write(170);

    status = "Closed";

  } else if (lightLevel > 50 && temperature > 20 && humidity > 20) {

    myservo1.write(120);  // Half-close the servos

    myservo2.write(120);

    status = "Partially Open";

  } else if (lightLevel < 50 && lightLevel > 20 && temperature > 20 && humidity > 20) {

    myservo1.write(50);  // Open the servos

    myservo2.write(50);

    status = "Open";

  } else if (lightLevel < 20 && temperature > 20 && humidity > 20) {

    myservo1.write(20);  // Open the servos

    myservo2.write(20);

    status = "Open Wide";

  } else {

    myservo1.write(Initial);  // Set servos to initial position

    myservo2.write(Initial);

    status = "Idle";

  }

  // Center the status on the second row

  int padding = (16 - status.length()) / 2;  // Calculate leading spaces to center the text

  lcd.setCursor(padding, 0);                 // Set cursor with leading spaces

  lcd.print(status);                         // Display centered status

  // For debugging, also print to Serial Monitor

  Serial.print("Temp: ");

  Serial.print(temperature);

  Serial.print(" C, Light: ");

  Serial.print(lightLevel);

  Serial.print("%, Status: ");

  Serial.println(status);

}