#include <LiquidCrystal_I2C.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64


Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);

LiquidCrystal_I2C lcd(0x27, 20, 4);

int ledPin = 13;                // choose the pin for the LED
int inputPin = 2;               // choose the input pin (for PIR sensor)
int pirState = LOW;             // we start, assuming no motion detected
int val = 0;                    // variable for reading the pin status

int sensePin = A0; //This is the Arduino Pin that will read the sensor output
int sensorInput; //The variable we will use to store the sensor input
double temp; //The variable we will use to store temperature in degrees.

unsigned long previousMillis = 0;
unsigned long currentMillis = 0;
unsigned long interval_temp = 10000;

void setup()
{
  Serial.begin(9600);
  pinMode(ledPin, OUTPUT);      // declare LED as output
  pinMode(inputPin, INPUT);     // declare sensor as input
  lcd.init();
  lcd.backlight();
  lcd.begin (20, 4);

  if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println(F("SSD1306 allocation failed"));
    for (;;);
  }
  delay(2000);
  display.clearDisplay();



}

void temperature_calc()
{
  sensorInput = analogRead(A0); //read the analog sensor and store it
  temp = (double)sensorInput / 1024; //find percentage of input reading
  temp = temp * 5; //multiply by 5V to get voltage
  temp = temp - 0.5; //Subtract the offset
  temp = temp * 100; //Convert to degrees

  float temperatureF = (temp * 9.0 / 5.0) + 32.0;

  lcd.setCursor(0, 0);
  lcd.print("TempC : ");
  lcd.setCursor(7, 0);
  lcd.print(temp);

  lcd.setCursor(0, 1);
  lcd.print("TempF : ");
  lcd.setCursor(7, 1);
  lcd.print(temperatureF);

  Serial.print("TempC : ");
  Serial.print(temp);
  Serial.print(" ");
  Serial.print("Tempf : ");
  Serial.print(temperatureF);
  Serial.println("");

  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(WHITE);
  display.setCursor(0, 10);
  display.println("TempC : ");
  display.setCursor(50, 10);
  display.println(temp);

  display.setCursor(0, 20);
  display.println("Tempf : ");
  display.setCursor(50, 20);
  display.println(temperatureF);
  display.display();

}
void loop()
{
  currentMillis = millis();
  if (currentMillis - previousMillis >= interval_temp)
  {
    previousMillis = currentMillis;
    temperature_calc();

  }

  val = digitalRead(inputPin);  // read input value from the PIR sensor
  if (val == HIGH)
  {
    if (pirState == LOW)
    {
      // motion detected
      digitalWrite(ledPin, HIGH);  // turn on LED
      pirState = HIGH;
      Serial.println("Motion Detected");
      interval_temp = 15000;
      lcd.setCursor(3, 2);
      lcd.print("Motion Detected");

      display.clearDisplay();
      display.setTextSize(1);
      display.setTextColor(WHITE);
      display.setCursor(20, 40);
      display.println("Motion Detected");
      display.display();


    }
  }
  else
  {
    if (pirState == HIGH)
    {
      // motion ended
      lcd.clear();
      lcd.setCursor(3, 2);
      lcd.print("Motion Ended");
      Serial.println("Motion Ended");
      display.clearDisplay();
      display.setTextSize(1);
      display.setTextColor(WHITE);
      display.setCursor(20, 40);
      display.println("Motion ENDED");
      display.setCursor(20, 50);
      display.println("Connected");
      display.display();
      delay(1000);
      digitalWrite(ledPin, LOW);   // turn off LED
      pirState = LOW;
      interval_temp = 10000;

    }
  }
}