#define BLYNK_TEMPLATE_ID "TMPL6sSTSU4i5"
#define BLYNK_TEMPLATE_NAME "Home Automation System"
#define BLYNK_AUTH_TOKEN "AWqFckllrZYAx4vgFjEW3oefqi212ERs"

#define BLYNK_PRINT Serial

#include <WiFi.h>
#include <WiFiClient.h>
#include <BlynkSimpleEsp32_SSL.h>
#include <LiquidCrystal_I2C.h>
#include <DHT.h>
#include <Wire.h>

char ssid[] = "Wokwi-GUEST";
char pass[] = "";

#define DHTPIN 32
#define DHTTYPE DHT22 // DHT 22
DHT dht(DHTPIN, DHTTYPE);

const int LDR_PIN = 35;
const int relayPin1 = 19;
const int relayPin2 = 18;
const int relayPin3 = 17;
const int relayPin4 = 16;
const int CO2_PIN = 25;

LiquidCrystal_I2C lcd(0x27, 16, 2); // I2C address 0x27, 16 column and 2 rows

BlynkTimer timer;

void myTimerEvent() {
  int potValue = analogRead(34);
  Blynk.virtualWrite(V2, potValue);
}

void sendSensor() {
  float h = dht.readHumidity();
  float t = dht.readTemperature(); // or dht.readTemperature(true) for Fahrenheit

  if (isnan(h) || isnan(t)) {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }
  Blynk.virtualWrite(V1, h);
  Blynk.virtualWrite(V0, t);
}

BLYNK_WRITE(V3) {
  int pinValue = param.asInt(); // assigning incoming value from pin V3 to a variable
  Serial.print("V3 Motor status: ");
  Serial.println(pinValue);
  digitalWrite(18, pinValue);
}

void setup() {
  pinMode(relayPin1, OUTPUT);
  pinMode(relayPin2, OUTPUT);
  pinMode(relayPin3, OUTPUT);
  pinMode(relayPin4, OUTPUT);

  pinMode(LDR_PIN, INPUT);

  Serial.begin(115200);
  lcd.init(); // initialize the lcd
  lcd.backlight();
  Serial.println("Hello, ESP32!");
  Blynk.begin(BLYNK_AUTH_TOKEN, ssid, pass);

  dht.begin();

  timer.setInterval(1000L, sendSensor);
  timer.setInterval(1000L, myTimerEvent);
  timer.setInterval(1000L, CO2Level); // Call CO2Level every 1 second
}

void CO2Level() {
  int16_t co2Value = analogRead(CO2_PIN);
  Serial.print("CO2 Sensor Value: ");
  Serial.println(co2Value);
  
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("CO2 Value: ");
  lcd.setCursor(0, 1);
  lcd.print(co2Value);
 delay(1000);
  }

void MoistureLevel() {
  int16_t i = analogRead(34);
  String msg = i < 2165 ? "WET" : i > 3135 ? "DRY" : "OK";
  
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Soil: ");
  lcd.print(msg);

  if (i < 3135) {
    digitalWrite(relayPin2, LOW);
  } else if (i > 3500) {
    digitalWrite(relayPin2, HIGH);
  }
}

void PhLevel() {
  int16_t p = analogRead(33);
  
  lcd.clear();
  lcd.setCursor(10, 0);
  lcd.print("PH: ");
  lcd.print(String(p));
}

void loop() {
  delay(10); // this speeds up the simulation

  int sensorValue = analogRead(LDR_PIN); // Read the LDR value (0-4095)
  int brightness = map(sensorValue, 0, 4095, 0, 255); // Map to LED brightness (0-255)

  if (sensorValue < 1000) {
    digitalWrite(relayPin4, LOW);
  } else if (sensorValue > 2000) {
    digitalWrite(relayPin4, HIGH);
  }

  MoistureLevel();
  PhLevel();
  Blynk.run();
  timer.run();
}