#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <PIR.h>

#define timeSeconds 10
#define I2C_ADDR 0x27
#define TOTAL_ROWS 2
#define TOTAL_COLUMNS 16
const int motionSensor = 27;
unsigned long now = millis();
unsigned long lastTrigger = 0;
boolean startTimer = false;
boolean motion = false;

LiquidCrystal_I2C lcd(I2C_ADDR, TOTAL_COLUMNS, TOTAL_ROWS);

void IRAM_ATTR detectsMovement() {
  
  startTimer = true;
  lastTrigger = millis();
}

void setup() {
  Serial.begin(115200);
   pinMode(motionSensor, INPUT_PULLUP);
  // Set motionSensor pin as interrupt, assign interrupt function and set RISING mode
  attachInterrupt(digitalPinToInterrupt(motionSensor), detectsMovement, RISING);

  lcd.init();                      // Initialize the LCD
  lcd.backlight();                 // Turn on the backlight
}

void loop() {
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("HELLO BHAVITHA");
  delay(2000);

  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Lets Count 0-20!");
  delay(2000);

  lcd.clear();
  for (int i = 0; i <= 20; i++) {
    lcd.setCursor(0, 1);
    lcd.print(i);
    delay(1000);
    lcd.clear();
  }
    // Current time
  now = millis();
  if(motion == false) {
    Serial.println("MOTION DETECTED!!!");
    motion = true;
  }
  // Turn off the LED after the number of seconds defined in the timeSeconds variable
  if(startTimer && (now - lastTrigger > (timeSeconds*1000))) {
    Serial.println("Motion stopped...");
    startTimer = false;
    motion = false;
  }
  
}