//=================================================================
// Project : Use human sensor 
//
// Date    : 2019-03-12
// Version : 1.0
//
// Note:
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY : without even the implied warranty of 
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE
//
// Hardware
// 1. Arduino UNO
// 2. I2C LCM (PCF8574A)
// 3. Human sensor
//=================================================================
 
#include "LiquidCrystal_I2C.h"

// PCF8574  - 0x27
// PCF8574A - 0x3F
#define LCM_I2C_ADDRESS   0x3f 
 
LiquidCrystal_I2C lcd(0x27, 16,2);

 #define HUMAN_SENSOR_PIN  2  

//====================================================
void setup()
{
  Serial.begin(9600);

  pinMode(HUMAN_SENSOR_PIN, INPUT);           // set pin to input
  digitalWrite(HUMAN_SENSOR_PIN, HIGH);       // turn on pullup resistors

   lcd.begin(16,2);
   lcd.clear();
   lcd.print("Human sensor");  
   lcd.setCursor(0,1);
   lcd.print("Demo 001");
   delay(2000);    
}

void loop()
{
   int value = digitalRead(HUMAN_SENSOR_PIN); 
   lcd.setCursor ( 0, 1 ); // go to the next line
   if (value==1)
      lcd.print("> Found <");  
   else 
      lcd.print("> ----- <");   
   delay(200);
}