#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C LCD = LiquidCrystal_I2C(0x27, 20, 4);

#define motion_pin 13 //name the pins
#define temp_pin 12
#define led_pin 14

const float BETA = 3950; // should match the Beta Coefficient of the thermistor
int motion_detection;
int analogValue;
int new_action = 0;
float aver_temp = 0.0;
float a = 0.0;
int b = 0;

void printTemperature( float temp ) {
  LCD.setCursor(0, 1);
  LCD.println("Temperature:");
  LCD.setCursor(13, 1);
  LCD.println(temp);
}

//Define pins mode and initialize LCD display
void setup() {
  Serial.begin(115200);
  pinMode(motion_pin, INPUT);// declare motion sensor as input
  pinMode(temp_pin, INPUT);// declare temp sensor as input
  pinMode(led_pin, OUTPUT);// declare LED as output
  LCD.init();
  LCD.backlight();
}

void loop() {

  motion_detection = digitalRead(motion_pin);
  
  while ( motion_detection ){ 
    analogValue = analogRead(temp_pin);
    float celsius = 1 / (log(1 / (4095. / analogValue - 1)) / BETA + 1.0 / 298.15) - 273.15;
    
    if ( digitalRead(motion_pin) == 1 ){
      LCD.setCursor(0, 0);
      LCD.println("Motion Detcted    ");
      aver_temp += celsius;
      a = a + 1.0;//number of temp
    }  
    printTemperature(celsius);
    Serial.print("Temperature is: "); Serial.println(celsius);
    if (celsius < 10){
      digitalWrite(led_pin, HIGH);
      LCD.setCursor(0, 2);
      LCD.println("LED On");
      Serial.println("LED On");
    }
    if (celsius >= 10){
      digitalWrite(led_pin, LOW);
      LCD.setCursor(0, 2);
      LCD.println("LED Off");
      Serial.println("LED off");
    }
    if ( digitalRead(motion_pin) == 0 ){
      LCD.setCursor(0, 0);
      LCD.println("NO Motion Detcted");
      LCD.setCursor(0, 3);
      LCD.println("Ave temp:");
      LCD.setCursor(10, 3);
      LCD.println(aver_temp/a);
      delay(2500);
      b++;
    }
    delay(500);//0.5 seconds
    if ( (b == 3) & (digitalRead(motion_pin)==0) ){
      LCD.clear();
      digitalWrite(led_pin, LOW);
      break;
    }
  }    
}