// Blynk Configuration
#define BLYNK_TEMPLATE_ID "TMPL6aMtKGnB6"
#define BLYNK_TEMPLATE_NAME "Thermal and pH Sensors"
#define BLYNK_AUTH_TOKEN "mjoI1jTfAzpa5C2OtJT3d3gW5lfraYnh"  // Replace with your Blynk Auth Token

#include <WiFi.h>
#include <BlynkSimpleEsp32.h>
#include <OneWire.h>
#include <DallasTemperature.h>

// WiFi credentials
const char* WIFI_NAME = "Wokwi-GUEST";
const char* WIFI_PASSWORD = "";  // Replace with your WiFi Password

// Sensor and Button pins
const int POT_PIN = 34;  // Use GPIO 34 for analog input on ESP32
const int BUTTON_PIN = 25;  // Button pin
const int oneWireBus = 12;  // GPIO where the DS18B20 is connected

// OneWire instance
OneWire oneWire(oneWireBus);
// Dallas Temperature sensor instance
DallasTemperature sensors(&oneWire);

WiFiClient client;
bool systemEnabled = true;  // Variable to track system state

BlynkTimer timer;

void setup() {
  Serial.begin(115200);

  // Setup DS18B20 sensor
  sensors.begin();

  pinMode(POT_PIN, INPUT);
  pinMode(BUTTON_PIN, INPUT_PULLDOWN);  // Configure button pin as input with pull-down resistor
  delay(1000);

  // Connect to WiFi
  WiFi.begin(WIFI_NAME, WIFI_PASSWORD);
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Connecting to WiFi...");
  }
  Serial.println("WiFi connected!");
  Serial.println("Local IP: " + String(WiFi.localIP()));
  WiFi.mode(WIFI_STA);

  // Connect to Blynk
  Blynk.begin(BLYNK_AUTH_TOKEN, WIFI_NAME, WIFI_PASSWORD);

  // Setup a function to be called every 2 seconds
  timer.setInterval(2000L, sendSensorData);
}

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

  // Check button state
  if (digitalRead(BUTTON_PIN) == HIGH) {
    systemEnabled = !systemEnabled;  // Toggle system state
    delay(300);  // Debounce delay
  }

  if (!systemEnabled) {
    // System disabled
    Serial.println("System Disabled");
  }
}

void sendSensorData() {
  if (systemEnabled) {
    // Read temperature from DS18B20
    sensors.requestTemperatures(); 
    float temperatureC_ds = sensors.getTempCByIndex(0);

    // Error checking for DS18B20 sensor
    if (temperatureC_ds == DEVICE_DISCONNECTED_C) {
      Serial.println("Error. No Sensor Detected");
      Blynk.virtualWrite(V1, "Error");  // Send error message to Blynk
    } else {
      // Send temperature to Blynk
      Blynk.virtualWrite(V1, temperatureC_ds);
      Serial.print("DS18B20 Temperature: ");
      Serial.print(temperatureC_ds);
      Serial.println(" °C");
    }

    // Read pH value
    float PHValue = map(analogRead(POT_PIN), 0, 4095, 0.0, 14.0);

    // Send pH value to Blynk
    Blynk.virtualWrite(V0, PHValue);
    Serial.print("pH Value: ");
    Serial.println(PHValue);
  }
}