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

LiquidCrystal_I2C lcd(0x27, 16, 2);

const int PIN_IR = 2;
const int PIN_BTN = 3;

int compteur = 0;
bool precedent = HIGH;

void setup() {
  pinMode(PIN_IR, INPUT);
  pinMode(PIN_BTN, INPUT_PULLUP);
  lcd.init();
  lcd.backlight();
  lcd.setCursor(0,0);
  lcd.print("Passages : 0");
}

void loop() {
  bool etat = digitalRead(PIN_IR);
  
  if (precedent == HIGH && etat == LOW) {
    compteur++;
    lcd.setCursor(0,0);
    lcd.print("Passages : ");
    lcd.print(compteur);
    lcd.print("   ");
    delay(300);
  }
  precedent = etat;

  if (digitalRead(PIN_BTN) == LOW) {
    compteur = 0;
    lcd.setCursor(0,0);
    lcd.print("Passages : 0   ");
    delay(500);
  }
}