// MCU BASIC: https://www.basic4mcu.com
// DateTime : 2019-05-30 오후 4:05:50
// by Ok-Hyun Park
//
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27,16,2);
//
int dust_sensor=A0; // 미세먼지
int sensor_led=12;  // 미세먼지 센서 안에 있는 적외선 led
int rgb_R=9,rgb_G=11,rgb_B=10;
//
int sampling=280,waiting=40;
float dust_value=0,dustDensityug=0,stop_time=9680;
//
void setup(){
  pinMode(sensor_led,OUTPUT);
  pinMode(4,OUTPUT);
  pinMode(rgb_R,OUTPUT); pinMode(rgb_G,OUTPUT); pinMode(rgb_B,OUTPUT);
  //
  pinMode(V_LED,OUTPUT);
  pinMode(Vo,INPUT);
  lcd.init(); lcd.backlight();
  Serial.begin(9600);
}
//
void loop(){
  digitalWrite(sensor_led,LOW);       delayMicroseconds(sampling);
  dust_value=analogRead(dust_sensor); delayMicroseconds(waiting);
  digitalWrite(sensor_led,HIGH);      delayMicroseconds(stop_time);
  dustDensityug=(0.17*(dust_value*(5.0/1024))-0.1)*1000;
  Serial.print("Dust Density[ug/m3]: "); Serial.print(dustDensityug);
  //
  lcd.clear(); lcd.home();
  if(dustDensityug<=30.0){ // 좋음
    analogWrite(rgb_R,0); analogWrite(rgb_G,0); analogWrite(rgb_B,255);
    lcd.print("AIR: GOOD      "); Serial.println("   blue");
  }
  else if(dustDensityug<=80.0){ // 보통
    analogWrite(rgb_R,0); analogWrite(rgb_G,255); analogWrite(rgb_B,0);
    lcd.print("AIR: NORMAL    "); Serial.println("   green");
  }
  else if(dustDensityug<=150.0){ // 나쁨
    analogWrite(rgb_R,255); analogWrite(rgb_G,155); analogWrite(rgb_B,0);
    lcd.print("AIR: BAD!"); Serial.println("   yellow");  
  }
  else{ // 매우 나쁨
    analogWrite(rgb_R,255); analogWrite(rgb_G,0); analogWrite(rgb_B,0);
    lcd.print("AIR: VERY BAD!!"); Serial.println("   red");
  }
  //
  lcd.setCursor(0,1);  lcd.print("ug/m3: ");  lcd.print(dustDensity);
  //
  delay(2000);
}