#define BLYNK_TEMPLATE_ID "TMPL6Adxi3wot"
#define BLYNK_TEMPLATE_NAME "Chemtex Sensor"
#define BLYNK_AUTH_TOKEN "GaZaIPUU7cd7n5NbCUqiDgesMrJmbd--"
#define BLYNK_PRINT Serial

#include <WiFi.h>
#include <BlynkSimpleEsp32.h>
#include <Wire.h> 
#include <LiquidCrystal_I2C.h>

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

LiquidCrystal_I2C lcd(0x27, 16, 2);

const int Gas_PIN = 35;
int led_green = 32;
int led_red = 33;
BlynkTimer timer;

void setup() {
  Wire.begin(23, 22);
  Serial.begin(9600);
  lcd.init();
  lcd.backlight();

  pinMode(Gas_PIN,INPUT);
  pinMode(led_green, OUTPUT);
  pinMode(led_red, OUTPUT);

  delay(3000);
  lcd.clear();

  Blynk.begin(auth, ssid, pass);
  timer.setInterval(2000, sendSensor);
}

void sendSensor() 
{
float analogValue = analogRead(Gas_PIN );
  Serial.print("Sensor RAW: ");
  Serial.println(analogValue, 0);
  int gasLevel = map(analogValue, 0, 4095, 0, 100);
  Serial.print(gasLevel, 0);
  Serial.println("%");
  Blynk.virtualWrite(V0, gasLevel);  

  String gasMsg;

  if (gasLevel < 20) {
    gasMsg = "IDEAL";
  } else {
    gasMsg = "CAUTION";
  }

  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Gas: ");
  lcd.print(gasMsg);
  lcd.setCursor(0, 1);
  lcd.print("Gas Level: ");
  lcd.print(gasLevel);
  lcd.print(" %");

  Serial.print("Gas Level: ");
  Serial.println(gasLevel);
  
  delayWithMillis(2000);

  

 if (gasLevel < 20) {
    digitalWrite(led_green, HIGH);
    Blynk.virtualWrite(V1, HIGH);
    digitalWrite(led_red, LOW);
    Blynk.virtualWrite(V2, LOW);

  } else {
    digitalWrite(led_green, LOW);
    Blynk.virtualWrite(V1, LOW);
    digitalWrite(led_red, HIGH);
    Blynk.virtualWrite(V2, HIGH);
  }
}

void delayWithMillis(unsigned long ms)
{
  unsigned long currentMillis = millis();
  while (millis() - currentMillis < ms)
  {
    // Do nothing, just wait
  }
}

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