//FA20 hyunho

#include <Adafruit_NeoPixel.h>
#ifdef __AVR__
#include <avr/power.h>      // Required for 16 MHz Adafruit Trinket
#endif


#define NUM_LEDS 1
#define DATA_PIN 0
#define HUMIDIFIER 9


Adafruit_NeoPixel pixels(NUM_LEDS, DATA_PIN, NEO_GRB + NEO_KHZ800);

#define DELAYVAL 500      // Time (in milliseconds) to pause between pixels

#include <Arduino.h>
#include <SoftwareSerial.h>
//#include <FastLED.h>
#define LENG 31           //0x42 + 31 bytes equal to 32 bytes
unsigned char buf[LENG];

int PM01Value=0;          //define PM1.0 value of the air detector module
int PM2_5Value=0;         //define PM2.5 value of the air detector module
int PM10Value=0;         //define PM10 value of the air detector module

int neor=255;
int neog=255;
int neob=255;

static int maxdust = 50;
static int mindust = 0;

SoftwareSerial PMSerial(6, 7); // RX, TX

void setup()
{
  pinMode(HUMIDIFIER, OUTPUT);
  pixels.begin();       // INITIALIZE NeoPixel strip object (REQUIRED)



  
  PMSerial.begin(9600);
  PMSerial.setTimeout(1500);
  pixels.setPixelColor(0, pixels.Color(255, 255, 255));
  pixels.show();
  digitalWrite(HUMIDIFIER, HIGH);
  delay(3000);
  pixels.setPixelColor(0, pixels.Color(0, 0, 0));
  pixels.show();
  digitalWrite(HUMIDIFIER, LOW);
}

void loop()
{

//Serial.print("loop:");
//unsigned int uptime = millis();
//Serial.println(uptime);
  measuredust();
  int firstr=255;
  int firstg=120;
  int firstb=0;
  //ledgo();

  if (PM2_5Value < mindust)
  {PM2_5Value = mindust;}
  if (PM2_5Value > maxdust)
  {PM2_5Value = maxdust;}
  firstr= map(PM2_5Value, mindust, maxdust, 255, 250);
  firstg= map(PM2_5Value, mindust, maxdust, 255, 120);
  firstb= map(PM2_5Value, mindust, maxdust, 255, 0);

  if (PM2_5Value = maxdust)
  { digitalWrite(HUMIDIFIER, HIGH); }
  else { digitalWrite(HUMIDIFIER, LOW); }             
                     
    if(firstr < neor){
      neor = neor - 1;
  } else {  
      neor = neor + 1;

      
  }
  
   if(firstg < neog){
      neog = neog - 1;
  } else {  
      neog = neog + 1;
  }

   if(firstb < neob){
      neob = neob - 1;
  } else {  
      neob = neob + 1;
  }

  pixels.setPixelColor(0, pixels.Color(neor, neog, neob));

  pixels.show();
  delay(10);
}


void measuredust(){
  


  static unsigned long OledTimer=millis();
    if (millis() - OledTimer >=10000)
    {
      OledTimer=millis();
  if(PMSerial.find(0x42)){
    PMSerial.readBytes(buf,LENG);

    if(buf[0] == 0x4d){
      if(checkValue(buf,LENG)){
        PM01Value=transmitPM01(buf); //count PM1.0 value of the air detector module
        PM2_5Value=transmitPM2_5(buf);//count PM2.5 value of the air detector module
        PM10Value=transmitPM10(buf); //count PM10 value of the air detector module
       }
     }
   }
 }

}
char checkValue(unsigned char *thebuf, char leng)
{
  char receiveflag=0;
  int receiveSum=0;

  for(int i=0; i<(leng-2); i++){
  receiveSum=receiveSum+thebuf[i];
  }
  receiveSum=receiveSum + 0x42;

  if(receiveSum == ((thebuf[leng-2]<<8)+thebuf[leng-1]))  //check the serial data
  {
    receiveSum = 0;
    receiveflag = 1;
  }
  return receiveflag;
}

int transmitPM01(unsigned char *thebuf)
{
  int PM01Val;
  PM01Val=((thebuf[3]<<8) + thebuf[4]); //count PM1.0 value of the air detector module
  return PM01Val;
}

//transmit PM Value to PC
int transmitPM2_5(unsigned char *thebuf)
{
  int PM2_5Val;
  PM2_5Val=((thebuf[5]<<8) + thebuf[6]);//count PM2.5 value of the air detector module
  return PM2_5Val;
  }

//transmit PM Value to PC
int transmitPM10(unsigned char *thebuf)
{
  int PM10Val;
  PM10Val=((thebuf[7]<<8) + thebuf[8]); //count PM10 value of the air detector module
  return PM10Val;
}