Sensor based Counting device - Design and implement basics embedded circuits

 Sensor based Counting device
Tinker Cad Simulation Circuit with Operational Code

Sensor Based Counting Circuit

Components required for above circuit:

1) Arduino Uno 3

2) PIR Sensors (x2)

3) LCD 16 x 2

4) Potentiometer 250 kilo ohm

5) Resistor 220 ohm

Coding for above circuit:

#include <LiquidCrystal.h>

int in = 15;

int inpr = 16;

int out = 14;

int outpr = 17;

int ppl = 0;

LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

bool pi = 0;

bool po = 0;

void setup() {

  pinMode(15, INPUT);

  pinMode(14, INPUT);

  pinMode(16, OUTPUT);

  pinMode(17, OUTPUT);

  lcd.begin(16, 2);

}

void loop() {

  lcd.clear();

  digitalWrite(outpr, HIGH);

  digitalWrite(inpr, HIGH);

  pi = digitalRead(in);

  po = digitalRead(out);

  if (pi == 1){

    ppl--;

    delay(500);

  }

  else if (po == 1){

    ppl++ ;

    delay(500);

  }

  ppl = constrain(ppl, 0, 50);

  lcd.setCursor(0, 0);

  lcd.print("PEOPLE IN:");

  lcd.setCursor(11, 0);

  lcd.print(ppl);

  if (ppl >= 20){

     lcd.setCursor(0, 1);

     lcd.print("PLEASE WAIT");

     delay(1000);

  }

  if (ppl <= 19){

     lcd.setCursor(0, 1);

     lcd.print("PLEASE VISIT");

     delay(1000);

  }

}