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

#define PPM_PIN 4

// RGB LED pin definitions
#define RED_PIN 2
#define GREEN_PIN 12
#define BLUE_PIN 13

void setup() {
  Wire.begin(23, 22); // Initialize I2C
  Serial.begin(115200); // Start serial communication
  Serial.println("Hello, ESP32!");

  // Initialize RGB LED pins
  pinMode(RED_PIN, OUTPUT);
  pinMode(GREEN_PIN, OUTPUT);
  pinMode(BLUE_PIN, OUTPUT);
}

void loop() {
  // Read value from the analog converter
  int16_t ppmValue = analogRead(PPM_PIN);
  
  // Map the correct value for ADC (max voltage to be 3.3V)
  int mappedppmValue = (ppmValue / 4.095);
  
  // Print the mapped PPM value
  Serial.print("PPM: ");
  Serial.println(mappedppmValue);
  
  // Control RGB LED based on the PPM value
  if (mappedppmValue < 200) { // Low pollution
    analogWrite(RED_PIN, 0);
    analogWrite(GREEN_PIN, 255); // Green
    analogWrite(BLUE_PIN, 0);
  } else if (mappedppmValue < 400) { // Moderate pollution
    analogWrite(RED_PIN, 255); // Yellow
    analogWrite(GREEN_PIN, 255);
    analogWrite(BLUE_PIN, 0);
  } else { // High pollution
    analogWrite(RED_PIN, 255); // Red
    analogWrite(GREEN_PIN, 0);
    analogWrite(BLUE_PIN, 0);
  }

  delay(100); // Wait for 100 milliseconds
}