#include <JC_Button.h> // https://github.com/JChristensen/JC_Button

const Button button1( 2 );
const Button button2( 3 );

const uint8_t leds_pins[] = { 12, 11, 10, 9, 8 };
const size_t leds_count = sizeof( leds_pins ) / sizeof( leds_pins[0] );

void setup()
{
  Serial.begin( 115200 );

  button1.begin();
  button2.begin();

  for ( uint8_t i = 0; i < leds_count; ++i )
  {
    pinMode( leds_pins[i], OUTPUT );
    digitalWrite( leds_pins[i], LOW );
  }
}

void loop()
{
  button1.read();
  button2.read();

  static uint8_t counter = 0;

  if ( counter < leds_count && button1.wasReleased()  )
  {
    ++counter;
    Serial.print( "Compteur = ");
    Serial.println( counter );
  }

  if ( button2.wasReleased() )
  {
    static uint8_t previous_counter = 0;

    for ( uint8_t i = 0; i < previous_counter; ++i )
    {
      Serial.print( "LED " );
      Serial.print( i + 1 );
      Serial.println( " off" );
      digitalWrite( leds_pins[i], LOW );
    }

    previous_counter = counter;

    if ( counter > 0 )
    {
      Serial.println( "Attente de 3 secondes..." );

      // 2 secondes maintenant, et 1 seconde au début de la boucle for,
      // comme ça il n'y a pas de délai après la dernière LED
      delay( 2000 );

      for ( uint8_t i = 0; i < counter; ++i )
      {
        delay( 1000 );
        Serial.print( "LED " );
        Serial.print( i + 1 );
        Serial.println( " on" );
        digitalWrite( leds_pins[i], HIGH );
      }

      Serial.println( "Cycle terminé" );
      counter = 0;
    }
  }
}