#define BLYNK_TEMPLATE_ID "TMPL3eHmROYVB"
#define BLYNK_TEMPLATE_NAME "soil monitoring"
#define BLYNK_AUTH_TOKEN "d4fzAT_GSea7Tb7picudqyNr2ZLrXtLP"

#include <HTTPClient.h>
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include "DHT.h"
#include <WiFi.h>
#include <BlynkSimpleEsp32.h>

#define DHTPIN 4
#define DHTTYPE DHT22
#define SOIL_MOISTURE_PIN 34
#define PH_PIN 35
#define BUZZER_PIN 18

char auth[] = BLYNK_AUTH_TOKEN;
char ssid[] = "Wokwi-GUEST"; // Use the Wokwi Guest network
char pass[] = "";

DHT dht(DHTPIN, DHTTYPE);
LiquidCrystal_I2C LCD(0x27, 16, 2);

// Function to map analog readings to pH values
float mapToPH(int sensorValue) {
  // Map the analog sensor value (0-4095) to the pH range (1-14)
  return 1 + (sensorValue / 4095.0) * 13.0;
}

void spinner() {
  static int8_t counter = 0;
  const char* glyphs = "\xa1\xa5\xdb";
  LCD.setCursor(15, 1);
  LCD.print(glyphs[counter++]);
  if (counter == strlen(glyphs)) {
    counter = 0;
  }
}

void setup() {
  Serial.begin(115200);
  
  LCD.init();
  LCD.backlight();
  LCD.setCursor(0, 0);
  LCD.print("Connecting to ");
  LCD.setCursor(0, 1);
  LCD.print("WiFi ");

  WiFi.begin(ssid, pass);
  while (WiFi.status() != WL_CONNECTED) {
    delay(250);
    spinner();
  }
  Serial.println("WiFi connected");
  Serial.print("IP address: ");
  Serial.println(WiFi.localIP());

  // Initialize DHT sensor
  dht.begin();

  // Initialize buzzer pin
  pinMode(BUZZER_PIN, OUTPUT);
  digitalWrite(BUZZER_PIN, LOW); // Ensure buzzer is off initially

  LCD.clear();
  LCD.setCursor(0, 0);
  LCD.println("Online");
  LCD.setCursor(0, 1);
  LCD.println("Updating time...");
  Blynk.begin(auth, ssid, pass);
  configTime(0, 0, "pool.ntp.org");
}

void loop() {
  // Ensure WiFi is connected
  if (WiFi.status() != WL_CONNECTED) {
    Serial.println("Reconnecting to WiFi...");
    WiFi.begin(ssid, pass);
    while (WiFi.status() != WL_CONNECTED) {
      delay(1000);
      Serial.print(".");
    }
    Serial.println(" Connected!");
  }

  // Read sensor data
  float humidity = dht.readHumidity();
  float temperature = dht.readTemperature();
  int soilMoistureValue = analogRead(SOIL_MOISTURE_PIN);
  int phSensorValue = analogRead(PH_PIN);

  // Check if any readings failed and exit early (to try again in the next loop)
  if (isnan(humidity) || isnan(temperature)) {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }

  // Map the pH sensor analog reading to pH value
  float pHValue = mapToPH(phSensorValue);

  // Print the sensor data
  Serial.print("Temperature: ");
  Serial.print(temperature);
  Serial.print(" *C, Humidity: ");
  Serial.print(humidity);
  Serial.print(" %, Soil Moisture: ");
  Serial.print(soilMoistureValue);
  Serial.print(", pH: ");
  Serial.println(pHValue);

  // Send data to Blynk
  Blynk.virtualWrite(V0, temperature);
  Blynk.virtualWrite(V1, humidity);
  Blynk.virtualWrite(V2, soilMoistureValue);
  Blynk.virtualWrite(V3, pHValue);

  // Display the sensor data on the LCD
  LCD.clear();
  LCD.setCursor(0, 0);
  LCD.print("T: ");
  LCD.print(temperature);
  LCD.print(" C");
  LCD.setCursor(0, 1);
  LCD.print("H: ");
  LCD.print(humidity);
  LCD.print(" %");

  // Activate buzzer if conditions are met
  if (temperature > 30.0 || temperature < 15.0 || humidity < 20.0 || humidity > 80.0 || pHValue < 5.5 || pHValue > 7.5) {
    digitalWrite(BUZZER_PIN, HIGH); // Turn on buzzer
  } else {
    digitalWrite(BUZZER_PIN, LOW);  // Turn off buzzer
  }

  delay(2000);
}