#include <IRremote.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

// OLED display
#define OLED_RESET 4
Adafruit_SSD1306 display(OLED_RESET); // Set the resolution


// LDR Characteristics （Light）
const float GAMMA = 0.7;
const float RL10 = 50;
float lux; // the measured light in unit lux

// Temperature sensor characteristics
const float BETA = 3950; // should match the Beta Coefficient of the thermistor
float temp_c; // the temperature measured in unit celsius

// IR remote control
#define PIN_RECEIVER 2   // Signal Pin of IR receiver
IRrecv receiver(PIN_RECEIVER);
int cont=0; // Represent the control of user

// Ultrasonic sensor detecting distance
#define ECHO_PIN 3
#define TRIG_PIN 4
float dis_cm;


void setup() {
  Serial.begin(9600);
  receiver.enableIRIn(); // Start the receiver
  pinMode(TRIG_PIN, OUTPUT); // pin 4 output
  pinMode(ECHO_PIN, INPUT);  // pin 3 input
  pinMode(11, OUTPUT);
  pinMode(12, OUTPUT);
  pinMode(13, OUTPUT);
  pinMode(A4, OUTPUT);
  pinMode(A5, OUTPUT);
}


void loop() {
  get_light();
  get_temp();
  dis_cm=get_dis();

  // Checks received an IR signal
  if (receiver.decode()) {
    translateIR();
    receiver.resume();  // Receive the next value
  }
  // Get the relevant sensor data
  
  if (cont==1 & lux>500 & temp_c>35 & dis_cm>5)
    close();
  else if (cont==1 & (lux<450 || temp_c<33) & dis_cm <50)
    open();
  else if (cont==2 & dis_cm<50)
    open();
  else if (cont==3 & dis_cm>5)
    close();
}

// The function to get light
void get_light(){
  int light_read = analogRead(A0);
  float voltage = light_read / 1024. * 5;
  float resistance = 2000 * voltage / (1 - voltage / 5);
  lux = pow(RL10 * 1e3 * pow(10, GAMMA) / resistance, (1 / GAMMA));
  /* Print the light in lux
  Serial.println("Light:");
  Serial.println(lux);
  Serial.println("lux"); */
  delay(100);
}

// The function to get temperature
void get_temp(){
   int temp_read = analogRead(A1);
  temp_c = 1 / (log(1 / (1023. / temp_read - 1)) / BETA + 1.0 / 298.15) - 273.15;
  /* Print the temperature in celsius
  Serial.print("Temperature: ");
  Serial.print(temp_c);
  Serial.println(" ℃"); */
  delay(100);
}

// The function to get the IR signal
void translateIR(){
  // Takes command based on IR code received
  switch (receiver.decodedIRData.command) {
    case 48: // '1' was pressed
      cont=1; // Represent the self-control method is on
      break;
    case 24: // '2' was pressed
      cont=2; // Represent the user want to open the curtain
      break;
    case 122: // '3' was pressed
      cont=3; // Represent the user want to close the curtain
      break;
    case 16: // '4' was pressed
      cont=4; // Represent the user want to close the curtain
      break;
  }
}

// The function to get distance between the middle point and the curtain
float get_dis(){
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);
  float duration = pulseIn(ECHO_PIN, HIGH);
  return duration / 50 ;
  delay (100);
}

// The function to open the curtain
void open(){
  digitalWrite(12,1); // denote HIGH as open
  digitalWrite(11,0);
  delay(10);
  digitalWrite(11,1);
  delay(100);
  digitalWrite(11,0);
  delay(10);
}

// The function to close the curtain
void close(){
  digitalWrite(12,0); // denote LOW as close
  digitalWrite(11,0);
  delay(10);
  digitalWrite(11,1);
  delay(100);
  digitalWrite(11,0);
  delay(10);
}
/*
// OLED initialize
void oled_on(){
  display.clearDisplay();   // clears the screen and buffer
  display.setTextSize(1);	// set the font size
  display.setTextColor(WHITE);	// set the font color
  display.setCursor(0,0);		// set the start of the cursor
  display.print("Temperature Outside: ");
  display.print(temp_c);
  display.println("°");
  display.print("Light Outside: ");
  display.print(lux);
  display.println("Lux");
  delay(2000);
  }*/