#include <Wire.h>
#include <Arduino.h>
#include <ledc.h>  // Include for PWM control

#define PPM_PIN 4

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

// Define PWM channels for the RGB pins
#define RED_CHANNEL 0
#define GREEN_CHANNEL 1
#define BLUE_CHANNEL 2

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

  // Initialize LEDC PWM channels
  ledcAttachChannel(RED_PIN, 5000, 8, RED_CHANNEL);   // 5kHz frequency, 8-bit resolution for Red
  ledcAttachChannel(GREEN_PIN, 5000, 8, GREEN_CHANNEL); // 5kHz frequency, 8-bit resolution for Green
  ledcAttachChannel(BLUE_PIN, 5000, 8, BLUE_CHANNEL);  // 5kHz frequency, 8-bit resolution for Blue
}

void loop() {
  // Read value from the analog converter (PPM sensor)
  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 to the Serial Monitor
  Serial.print("PPM: ");
  Serial.println(mappedppmValue);
  
  // Control RGB LED based on the PPM value
  if (mappedppmValue < 200) { // Low pollution
    ledcWriteChannel(RED_CHANNEL, 0);
    ledcWriteChannel(GREEN_CHANNEL, 255); // Green
    ledcWriteChannel(BLUE_CHANNEL, 0);
  } else if (mappedppmValue < 400) { // Moderate pollution
    ledcWriteChannel(RED_CHANNEL, 255); // Yellow
    ledcWriteChannel(GREEN_CHANNEL, 255);
    ledcWriteChannel(BLUE_CHANNEL, 0);
  } else { // High pollution
    ledcWriteChannel(RED_CHANNEL, 255); // Red
    ledcWriteChannel(GREEN_CHANNEL, 0);
    ledcWriteChannel(BLUE_CHANNEL, 0);
  }

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