// MCU BASIC: https://www.basic4mcu.com
// DateTime : 2018-06-17 오전 2:52:14
// by Ok-Hyun Park
//
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x3F,16,2);
//
#include <Servo.h> 
int servoPin=9;
//
int dust_sensor=A0;
int sensor_led=12;
int rgb_red=5,rgb_green=6,rgb_blue=7; // rgb
int piezo=3;
//
float dust_value=0,dustDensityug=0;
//
void setup(){
  Serial.begin(9600);
  pinMode(sensor_led,OUTPUT); // 미세먼지 적외선 led
  pinMode(rgb_red,OUTPUT); pinMode(rgb_green,OUTPUT); pinMode(rgb_blue,OUTPUT); // 3색 LED
  pinMode(piezo,OUTPUT);
  lcd.init(); lcd.backlight();
  servo.attach(servoPin);
}
//
void loop(){
  digitalWrite(sensor_led,LOW);       delayMicroseconds( 280); // LED 켜기
  dust_value=analogRead(dust_sensor); delayMicroseconds(  40); // 센서 값 읽어오기
  digitalWrite(sensor_led,HIGH);      delayMicroseconds(9680); // LED 끄기
  dustDensityug=(0.17*(dust_value*(5.0/1024))-0.1)*1000;
  lcd.setCursor(0,0); lcd.print("HAP: ");
  lcd.setCursor(0,1); lcd.print(dustDensityug);
  //
  if(dustDensityug<=30.0){ //  좋음 파란색
    analogWrite(rgb_red,0); analogWrite(rgb_green,0); analogWrite(rgb_blue,255);
    lcd.print("blue");
    servo.write(90);
  }
  else if(dustDensityug<=80.0){ // 보통 녹색
    analogWrite(rgb_red,0); analogWrite(rgb_green,255); analogWrite(rgb_blue,0);
    lcd.print("green");
  }
  else if(dustDensityug<=150.0){ // 나쁨 노란색
    analogWrite(rgb_red,255); analogWrite(rgb_green,155); analogWrite(rgb_blue,0);
    lcd.print("yellow");
    digitalWrite(piezo,HIGH); delay(1000); digitalWrite(piezo,LOW); delay(1000);
  }
  else{ // 매우 나쁨빨간색
    analogWrite(rgb_red,255); analogWrite(rgb_green,0); analogWrite(rgb_blue,0);
    lcd.print("red");
    digitalWrite(piezo,HIGH); delay(1000); digitalWrite(piezo,LOW); delay(1000);
    servo.write(180);
  }
  delay(2000);
}