#include "DHT.h"
#include "Wire.h"
#include "LiquidCrystal_I2C.h"
 
// Pin Definitions
#define POWER_PIN 32 // ESP32's pin GPIO32 that provides the power to the rain sensor
#define DO_PIN 13 // ESP32's pin GPIO13 connected to DO pin of the rain sensor
#define DHT_SENSOR_PIN 21 // ESP32 pin GPIO21 connected to DHT22 sensor
#define TRIG_PIN 23 // ESP32 pin GPIO23 connected to Ultrasonic Sensor's TRIG pin
#define ECHO_PIN 22 // ESP32 pin GPIO22 connected to Ultrasonic Sensor's ECHO pin
#define BUZZER_PIN 25 // ESP32 pin GPIO25 connected to Buzzer
#define LED_PIN 18 // ESP32 pin GPIO26 connected to LED

// create an LCD object (Hex address, # characters, # rows)
// my LCD display in on Hex address 27 and is a 16x2 version
LiquidCrystal_I2C lcd(0x27, 16, 2);

// DHT Sensor Object
DHT dht_sensor(DHT_SENSOR_PIN, DHT22);

void setup() {
 // Initialize Serial Communication
 Serial.begin(9600);

 // Initialize the Arduino's pin as an input pin
 pinMode(POWER_PIN, OUTPUT);
 pinMode(DO_PIN, INPUT);
 pinMode(TRIG_PIN, OUTPUT);
 pinMode(ECHO_PIN, INPUT);
 pinMode(BUZZER_PIN, OUTPUT);
 pinMode(LED_PIN, OUTPUT);

 // Initialize the DHT sensor
 dht_sensor.begin();
 lcd.begin(16, 2);
 lcd.init();
 lcd.backlight();
 lcd.print("weather station"); 
}

void loop() {
 // Read humidity and temperature from DHT sensor
 float humi = dht_sensor.readHumidity();
 float tempC = dht_sensor.readTemperature();
 lcd.clear();
 // Print temperature to Serial Monitor
 Serial.print("Temperature: ");
 Serial.print(tempC);
 Serial.println("°C ");
// Print Temperature to LCD Monitor
 lcd.setCursor(0, 0);
 lcd.print("Temperature: ");
 lcd.setCursor(0, 1);
 lcd.print(tempC);
 lcd.print("°C");
 delay(2000);
 lcd.clear();
 

 // Generate 10-microsecond pulse to TRIG pin
 digitalWrite(TRIG_PIN, HIGH);
 delayMicroseconds(10);
 digitalWrite(TRIG_PIN, LOW);

 // Measure duration of pulse from ECHO pin
 long duration_us = pulseIn(ECHO_PIN, HIGH);

 // Calculate the distance
 float distance_cm = 0.017 * duration_us;

 // Print the value to Serial Monitor
 Serial.print("distance: ");
 Serial.print(distance_cm);
 Serial.println(" cm");

 // Print the value to LCD Monitor
 lcd.setCursor(0 , 0);
 lcd.println("Distance: ");
 lcd.setCursor(0 , 1);
 lcd.print(distance_cm);
 lcd.println(" cm");
 delay(2000);
 lcd.clear();

 // Rain Sensor Part
 digitalWrite(POWER_PIN, HIGH); // turn the rain sensor's power ON
 delay(10); // wait 10 milliseconds

 int rain_state = digitalRead(DO_PIN);

 digitalWrite(POWER_PIN, LOW); // turn the rain sensor's power OFF

 if (rain_state == HIGH) {
    Serial.println("The rain is NOT detected");
    lcd.setCursor(0, 0);
    lcd.println("The rain is NOT ");
    lcd.setCursor(0, 1);
    lcd.println("Detected");
    digitalWrite(BUZZER_PIN, LOW); // turn the buzzer OFF
    digitalWrite(LED_PIN, LOW); // turn the LED OFF
 } else {
    Serial.println("The rain is detected");
    lcd.setCursor(0, 0);
    lcd.println("The rain is ");
    lcd.setCursor(0, 1);
    lcd.println("Detected");
    digitalWrite(BUZZER_PIN, HIGH); // turn the buzzer ON
    digitalWrite(LED_PIN, HIGH); // turn the LED ON
 }
 delay(2000); // pause for 2 seconds
 lcd.clear();
}