#define BLYNK_TEMPLATE_ID "TMPL6OcE_ipFI"
#define BLYNK_TEMPLATE_NAME "SMART SOLAR TRACKER"
#define BLYNK_AUTH_TOKEN "7diveLnZEh7maIIEnxq1OrlbDxnrmtut"

#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <ESP32Servo.h>
#include <OneWire.h>
#include <DallasTemperature.h>
#include <WiFi.h>
#include <WiFiClient.h>
#include <BlynkSimpleEsp32.h>

// Blynk authentication token
char auth[] = "7diveLnZEh7maIIEnxq1OrlbDxnrmtut";

// Define the pins for the relay, LDR sensors, servo motors, potentiometer, LCD I2C, and DS18B20
const int relayPin = 22;        // GPIO22 for relay module (IN pin)
const int ldrPin1 = 14;         // GPIO14 for LDR 1 (AO pin)
const int ldrPin2 = 12;         // GPIO12 for LDR 2 (AO pin)
const int servoPin1 = 17;       // GPIO17 for Servo 1 (PWM pin)
const int servoPin2 = 16;       // GPIO16 for Servo 2 (PWM pin)
const int potentiometerPin = 4; // GPIO4 for potentiometer
const int SDA_PIN = 34;         // GPIO34 for SDA (I2C)
const int SCL_PIN = 35;         // GPIO35 for SCL (I2C)
const int ONE_WIRE_BUS = 33;    // GPIO33 for DS18B20

// Setup the OneWire bus
OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature sensors(&oneWire);

// Setup the LCD
LiquidCrystal_I2C lcd(0x27, 16, 2); // Address 0x27, 16 columns, 2 rows

// Define servo objects
Servo servo1;
Servo servo2;

// Blynk connection details
char ssid[] = "Wokwi-GUEST";
char pass[] = "";


// Blynk virtual pins
#define RELAY_VPIN V0

BlynkTimer timer;

void setup() {
  // Initialize serial communication
  Serial.begin(115200);

  // Initialize Blynk
  Blynk.begin(auth, ssid, pass);

  // Configure the relay pin as output
  pinMode(relayPin, OUTPUT);
  digitalWrite(relayPin, LOW); // Ensure relay is off initially
  
  // Configure the LDR pins as inputs (default state)
  pinMode(ldrPin1, INPUT);
  pinMode(ldrPin2, INPUT);

  // Attach servo objects to pins
  servo1.setPeriodHertz(50); // Standard 50 Hz servo
  servo1.attach(servoPin1, 1000, 2000); // servoPin1, min pulse width, max pulse width
  servo2.setPeriodHertz(50);
  servo2.attach(servoPin2, 1000, 2000);

  // Initialize the LCD
  lcd.init();
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print("Temperature:");

  // Initialize the DS18B20 temperature sensor
  sensors.begin();

  // Setup a timed function to update Blynk
  timer.setInterval(1000L, sendSensorData);
}

void loop() {
  Blynk.run();
  timer.run();
}

void sendSensorData() {
  // Read the analog values from the LDR sensors
  int ldrValue1 = analogRead(ldrPin1);
  int ldrValue2 = analogRead(ldrPin2);

  // Read the potentiometer value
  int potValue = analogRead(potentiometerPin);

  // Read temperature from DS18B20
  sensors.requestTemperatures(); // Send the command to get temperature readings
  float temperatureC = sensors.getTempCByIndex(0); // Get temperature in Celsius

  // Print temperature to LCD
  lcd.setCursor(0, 1);
  lcd.print(temperatureC, 1);
  lcd.print(" C  ");

  // Control the relay based on LDR values
  // (Controlled by Blynk app)

  // Control the servo motors based on LDR values and potentiometer value
  // Example: Servos move based on the difference between LDR readings, speed controlled by potentiometer
  int difference = ldrValue1 - ldrValue2;

  if (difference > 50) {
    // Move servo1 towards sunlight with speed controlled by the potentiometer
    servo1.write(map(potValue, 0, 1023, 10, 170));
    servo2.write(map(potValue, 0, 1023, 10, 170));
  } else if (difference < -50) {
    // Move servo2 towards sunlight with speed controlled by the potentiometer
    servo1.write(map(potValue, 0, 1023, 10, 170));
    servo2.write(map(potValue, 0, 1023, 10, 170));
  } else {
    // No significant difference, stop both servos
    servo1.write(90);
    servo2.write(90);
  }
}

BLYNK_WRITE(RELAY_VPIN) {
  int relayState = param.asInt();
  digitalWrite(relayPin, relayState);
}