#define BLYNK_TEMPLATE_ID "TMPL3y_0KXnKn"
#define BLYNK_TEMPLATE_NAME "soil monitoring system"
#define BLYNK_AUTH_TOKEN "rhnZrYB3VGakgpJmpsM7phc73JjUTULR"
#define VIRTUAL_PIN V0 

#include <BlynkSimpleEsp32.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

#define SCREEN_WIDTH 128    // OLED display width, in pixels
#define SCREEN_HEIGHT 64    // OLED display height, in pixels
#define OLED_RESET -1       // Reset pin # (or -1 if sharing Arduino reset pin)
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

#define RE 8
#define DE 7

char auth[] = "rhnZrYB3VGakgpJmpsM7phc73JjUTULR";
char ssid[] = "Wokwi-GUEST";
char pass[] = "";

const byte nitro[] = {0x01, 0x03, 0x00, 0x1e, 0x00, 0x01, 0xe4, 0x0c};
const byte phos[] = {0x01, 0x03, 0x00, 0x1f, 0x00, 0x01, 0xb5, 0xcc};
const byte pota[] = {0x01, 0x03, 0x00, 0x20, 0x00, 0x01, 0x85, 0xc0};

byte values[11];

#include <DHT.h>
#include <LiquidCrystal.h>

// Define pin numbers
#define DHT_PIN 16      // Pin to which DHT22 sensor is connected
#define BUZZER_PIN 17   // Pin to which the buzzer is connected
#define MOISTURE_SENSOR_PIN 34 // Pin to which the moisture sensor is connected

// Define the type of DHT sensor
#define DHT_TYPE DHT22 // Change to DHT11 if using DHT11 sensor
DHT dht(DHT_PIN, DHT_TYPE);

// Initialize the LCD (pins connected to the LCD: RS, E, D4, D5, D6, D7)
LiquidCrystal lcd(2, 4, 5, 18, 19, 21);

int red_led = 25;
int green_led = 26;
int blue_led = 27;

void setup() {
  pinMode(RE, OUTPUT);
  pinMode(DE, OUTPUT);

  display.begin(SSD1306_SWITCHCAPVCC, 0x3C); //initialize with the I2C addr 0x3C (128x64)

  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { // Address 0x3D for 128x64
    Serial.println(F("SSD1306 allocation failed"));
    for(;;);
  }

  delay(500);
  display.clearDisplay();
  display.setCursor(25, 15);
  display.setTextSize(1);
  display.setTextColor(WHITE);
  display.println(" NPK Sensor");
  display.setCursor(25, 35);
  display.setTextSize(1);
  display.print("Menghitung ...");
  display.display();
  delay(3000);
  
  // Initialize the LCD
  lcd.begin(16, 2);
  lcd.print("Temp:");
  lcd.setCursor(0, 1);
  lcd.print("Humidity:");
  
  // Initialize the DHT sensor
  dht.begin();

  // Set up the buzzer pin
  pinMode(BUZZER_PIN, OUTPUT);

  // Initialize serial communication
  Serial.begin(115200);

  // Set up the pins for the moisture sensor LEDs
  pinMode(red_led, OUTPUT);   // Red LED
  pinMode(green_led, OUTPUT); // Green LED
  pinMode(blue_led, OUTPUT);  // Blue LED
  
  Blynk.begin(auth, ssid, pass);

  while (Blynk.connect() == false) {
    Serial.println("Couldn't connect to Blynk.");
  }
  
  // Initialize LEDC for RGB LED control
  ledcSetup(0, 5000, 8); // LEDC channel 0, 5 kHz frequency, 8-bit resolution for red LED
  ledcSetup(1, 5000, 8); // LEDC channel 1, 5 kHz frequency, 8-bit resolution for green LED
  ledcSetup(2, 5000, 8); // LEDC channel 2, 5 kHz frequency, 8-bit resolution for blue LED

  // Attach LEDC channels to the GPIO pins
  ledcAttachPin(red_led, 0);   // Red LED
  ledcAttachPin(green_led, 1); // Green LED
  ledcAttachPin(blue_led, 2);  // Blue LED
}

void loop() {
  byte val1, val2, val3;
  val1 = random(0, 350); // Generate random value for nitrogen (0-255)
  delay(250);
  val2 = random(0, 350); // Generate random value for phosphorous (0-255)
  delay(250);
  val3 = random(0, 330); // Generate random value for potassium (0-255)
  delay(250);
  
  Serial.println();
  Serial.print("Nitrogen: ");
  Serial.print(val1);
  Serial.println(" mg/kg");
  Serial.print("Phosphorous: ");
  Serial.print(val2);
  Serial.println(" mg/kg");
  Serial.print("Potassium: ");
  Serial.print(val3);
  Serial.println(" mg/kg");
  Serial.println();
  delay(2000);

  display.clearDisplay();

  display.setTextSize(2);
  display.setCursor(0, 5);
  display.print("N: ");
  display.print(val1);
  display.setTextSize(1);
  display.print(" mg/kg");

  display.setTextSize(2);
  display.setCursor(0, 25);
  display.print("P: ");
  display.print(val2);
  display.setTextSize(1);
  display.print(" mg/kg");

  display.setTextSize(2);
  display.setCursor(0, 45);
  display.print("K: ");
  display.print(val3);
  display.setTextSize(1);
  display.print(" mg/kg");

  display.display();
  
  // Read the moisture sensor value
  int moistureValue = analogRead(MOISTURE_SENSOR_PIN);
  
  // Determine moisture level and set LEDs accordingly
  if (moistureValue <= 100) {
    led_color(0, 0, 0); // Turn off RGB LED
  } else if (moistureValue > 100 && moistureValue <= 499) {
    led_color(0, 255, 0); // Green
  } else if (moistureValue > 499 && moistureValue <= 1023) {
    led_color(255, 0, 0); // Red
  }

  // Read temperature and humidity from the DHT sensor
  float temperature = dht.readTemperature();
  float humidity = dht.readHumidity();

  // Display temperature on the LCD
  lcd.setCursor(6, 0);
  lcd.print(temperature, 1);
  lcd.print("C");

  // Display humidity on the LCD
  lcd.setCursor(10, 1);
  lcd.print(humidity, 1);
  lcd.print("%");

  // Check if temperature is above a threshold value and activate the buzzer
  if (temperature > 30.0 || temperature < 0.0) {
    digitalWrite(BUZZER_PIN, HIGH);
    tone(BUZZER_PIN, 10000); // Generate a tone of 1000 Hz
    //Blynk.virtualWrite(VIRTUAL_PIN, value)
  } else {
    digitalWrite(BUZZER_PIN, LOW);
    noTone(BUZZER_PIN); // Stop the tone
  }
}

void led_color(int red_value, int green_value, int blue_value) {
  ledcWrite(0, red_value);   // Set red LED brightness
  ledcWrite(1, green_value); // Set green LED brightness
  ledcWrite(2, blue_value);  // Set blue LED brightness
}