#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <Adafruit_Sensor.h>
#include <DHT.h>
#include <DHT_U.h>

// Define pins
#define VOLTAGE_POT_PIN 34 // Potentiometer to simulate voltage input to GPIO34
#define CURRENT_POT_PIN 35 // Potentiometer to simulate current input to GPIO35
#define DHTPIN 15          // DHT22 data pin to GPIO15
#define TRIG_PIN 5         // Ultrasonic sensor Trig pin to GPIO5
#define ECHO_PIN 18        // Ultrasonic sensor Echo pin to GPIO18
#define RED_LED_PIN 25     // Red LED pin to GPIO25
#define GREEN_LED_PIN 26   // Green LED pin to GPIO26

// Define constants
#define DHTTYPE DHT22      // DHT22 (AM2302)
#define TEMP_THRESHOLD 65  // Temperature threshold for red LED activation
#define DUST_THRESHOLD 10  // Dust threshold in cm

// Initialize LCD
LiquidCrystal_I2C lcd(0x27, 16, 2); // Set the LCD address to 0x27 for a 16 chars and 2 line display

// Initialize DHT sensor
DHT dht(DHTPIN, DHTTYPE);

void setup() {
  Serial.begin(115200);
  
  // Initialize LCD
  lcd.init();
  lcd.backlight();
  
  // Initialize DHT sensor
  dht.begin();

  // Initialize Ultrasonic Sensor
  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);

  // Initialize LEDs
  pinMode(RED_LED_PIN, OUTPUT);
  pinMode(GREEN_LED_PIN, OUTPUT);

  // Turn on green LED initially
  digitalWrite(GREEN_LED_PIN, HIGH);
  digitalWrite(RED_LED_PIN, LOW);
}

float readDistanceCM() {
  // Send a 10us pulse to trigger the sensor
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);

  // Read the echo pin
  long duration = pulseIn(ECHO_PIN, HIGH);

  // Calculate the distance in cm
  float distance = duration * 0.034 / 2;

  return distance;
}

void loop() {
  // Read potentiometer values
  int voltagePotValue = analogRead(VOLTAGE_POT_PIN);
  int currentPotValue = analogRead(CURRENT_POT_PIN);
  
  // Convert potentiometer values to meaningful units
  float simulatedVoltage = (voltagePotValue / 4095.0) * 3.3; // Assuming 3.3V reference
  float simulatedCurrent = (currentPotValue / 4095.0) * 3.3; // Assuming 3.3V reference

  // Read temperature and humidity
  float temperature = dht.readTemperature();
  float humidity = dht.readHumidity();
  
  // Read distance from ultrasonic sensor
  float distance = readDistanceCM();
  
  // Display simulated voltage and current on LCD
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("V: ");
  lcd.print(simulatedVoltage, 2);
  lcd.print("V ");
  lcd.print("I: ");
  lcd.print(simulatedCurrent, 2);
  lcd.print("A");

  delay(2000); // Wait 2 seconds

  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Temp: ");
  lcd.print(temperature);
  lcd.print("C ");
  lcd.setCursor(0, 1);
  lcd.print("Hum: ");
  lcd.print(humidity);
  lcd.print("%");

  delay(2000); // Wait 2 seconds

  lcd.clear();
  if (temperature > TEMP_THRESHOLD) {
    // Temperature above threshold
    lcd.setCursor(0, 0);
    lcd.print("High Temp");
    digitalWrite(RED_LED_PIN, HIGH);
    digitalWrite(GREEN_LED_PIN, LOW);
  } else {
    // Normal temperature
    lcd.setCursor(0, 0);
    lcd.print("Normal Temp");
    digitalWrite(GREEN_LED_PIN, HIGH);
    digitalWrite(RED_LED_PIN, LOW);
  }

  // Display dust detection status on LCD
  lcd.setCursor(0, 1);
  if (distance <= DUST_THRESHOLD) {
    lcd.print("Dust Detected");
  } else {
    lcd.print("No Dust");
  }

  delay(2000); // Wait 2 seconds
}