#include <WiFi.h>
#include <OneWire.h>
#include <DallasTemperature.h>
#include "ThingSpeak.h"
#include <LiquidCrystal_I2C.h> // Include the library for the LCD

// Constants for pins
const int LDR_PIN = 34;          // Pin for the photoresistor (analog pin)
const int LED_PIN = 13;          // Pin for the LED
const int ONE_WIRE_BUS = 2;      // Pin for the DS18B20 data line

// Wi-Fi and ThingSpeak credentials
const char* WIFI_NAME = "Wokwi-GUEST";
const char* WIFI_PASSWORD = "";
const int myChannelNumber = 2647114;
const char* myApiKey = "CPHZI3P1T1S7OWH5";

// Create instances
WiFiClient client;
OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature sensors(&oneWire);
LiquidCrystal_I2C lcd(0x27, 16, 2); // Change the I2C address if needed (0x27 is common)

// Setup function
void setup() {
  Serial.begin(115200);
  pinMode(LED_PIN, OUTPUT);
  
  // Start the LCD
  lcd.begin();
  lcd.backlight(); // Turn on the backlight

  // Start the DallasTemperature library
  sensors.begin();
  
  // Connect to Wi-Fi
  WiFi.begin(WIFI_NAME, WIFI_PASSWORD);
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Wifi not connected");
  }
  
  Serial.println("Wifi connected!");
  Serial.println("Local IP: " + String(WiFi.localIP()));
  WiFi.mode(WIFI_STA);
  ThingSpeak.begin(client);
}

void loop() {
  // Read light value from LDR
  int lightValue = analogRead(LDR_PIN);
  
  // Read temperature from DS18B20
  sensors.requestTemperatures();
  float temperature = sensors.getTempCByIndex(0); // Get temperature in Celsius

  // Send data to ThingSpeak
  ThingSpeak.setField(1, lightValue); // Set light value to field 1
  ThingSpeak.setField(2, temperature); // Set temperature to field 2

  // LED control based on light value
  if (lightValue < 200) { // Adjust this threshold as needed
    digitalWrite(LED_PIN, HIGH); // Turn on LED if it's dark
  } else {
    digitalWrite(LED_PIN, LOW); // Turn off LED if it's bright
  }

  int x = ThingSpeak.writeFields(myChannelNumber, myApiKey);

  // Print data to Serial Monitor
  Serial.println("Light Value: " + String(lightValue));
  Serial.println("Temperature: " + String(temperature, 2) + "°C");
  
  // Display on LCD
  lcd.clear(); // Clear the LCD
  lcd.setCursor(0, 0); // Set cursor to first row
  lcd.print("LDR: " + String(lightValue)); // Print light value
  lcd.setCursor(0, 1); // Set cursor to second row
  lcd.print("Temp: " + String(temperature, 1) + "C"); // Print temperature

  if (x == 200) {
    Serial.println("Data pushed successfully");
  } else {
    Serial.println("Push error: " + String(x));
  }
  
  Serial.println("---");
  delay(5000); // Wait for 5 seconds before the next reading
}