/*
  Forum: https://forum.arduino.cc/t/showing-different-text-when-the-infrared-sensor-detected-a-motion/1351081
  Wokwi: https://wokwi.com/projects/422146387829978113

  ec2021

*/
#include <LiquidCrystal_I2C.h>

constexpr int I2C_ADDR    {0x27};
constexpr int LCD_COLUMNS {20};
constexpr int LCD_LINES   {2};

LiquidCrystal_I2C lcd(I2C_ADDR, LCD_COLUMNS, LCD_LINES);

constexpr byte pirPin {7};
byte  pirState = LOW;
byte prevState = HIGH;


void setup() {
  pinMode(pirPin, INPUT_PULLUP);
  lcd.init();
  lcd.backlight();
  lcd.setCursor(4, 0);
  lcd.print(F("PIR Demo"));
}

void loop() {
  pirState = digitalRead(pirPin);
  if (pirState != prevState) {
    prevState = pirState;
    lcd.setCursor(0, 1);
    if (pirState == LOW) {
      lcd.print(F("    No Motion   "));
    } else {
      lcd.print(F("Motion Detected!"));
    }
  }
}