#include <MQ135.h>
#include <Wire.h>
#include <Arduino.h>

// Definisikan pin-pinning yang digunakan
#define LED_HIJAU_PIN 23
#define LED_KUNING_PIN 22
#define LED_MERAH_PIN 21
#define BUZZER_PIN 19
#define PPM_PIN 4


void setup() {
  // Set up pin sebagai output
  pinMode(LED_HIJAU_PIN, OUTPUT);
  pinMode(LED_KUNING_PIN, OUTPUT);
  pinMode(LED_MERAH_PIN, OUTPUT);
  pinMode(BUZZER_PIN, OUTPUT);

  Serial.begin(115200);
}

void loop() {
   // Value after from AD convertor
   int16_t ppmValue = analogRead(PPM_PIN);
   // Map the correct value ad AD convertor expects max votage to be 3.3 V and we are sending 5 V
   int CO2 = (ppmValue/4.095);

   Serial.print("PPM: ");
  //  Print maapedTdsValue
   Serial.println(CO2);

 
  if (CO2 < 150) {
    
    digitalWrite(LED_HIJAU_PIN, HIGH);
    digitalWrite(LED_KUNING_PIN, LOW);
    digitalWrite(LED_MERAH_PIN, LOW);
    noTone(BUZZER_PIN);
  } else if (CO2 >= 150 && CO2 < 186) {
    
    digitalWrite(LED_HIJAU_PIN, LOW);
    digitalWrite(LED_KUNING_PIN, HIGH);
    digitalWrite(LED_MERAH_PIN, LOW);
    noTone(BUZZER_PIN);
  } else {

    digitalWrite(LED_HIJAU_PIN, LOW);
    digitalWrite(LED_KUNING_PIN, LOW);
    digitalWrite(LED_MERAH_PIN, HIGH);
    noTone(BUZZER_PIN);
    delay(100);
    tone(BUZZER_PIN, 80);
  }

  delay(100);
}