#define led_vermelho 21
#define led_azul 19
#define botao 33
#define buzzer 23
#define ldr 34

int freq_buzzer;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");

  pinMode(led_vermelho, OUTPUT);
  pinMode(led_azul, OUTPUT);
  pinMode(botao, INPUT_PULLUP); // pressionado -> LOW (0)
  pinMode(buzzer, OUTPUT);

  digitalWrite(led_vermelho, 0 );
  digitalWrite(led_azul, 0 );

}

void loop() {
  // put your main code here, to run repeatedly:

  if ( digitalRead(botao) == LOW ) {

    digitalWrite(led_vermelho, !digitalRead(led_vermelho) );
    digitalWrite(led_azul, !digitalRead(led_azul));

    freq_buzzer += 100; //freq_buzzer = freq_buzzer + 100
    tone(buzzer, freq_buzzer, 100);

    Serial.println( analogRead(ldr) );

    while( digitalRead(botao) == LOW ) {}
  }

  delay(10); // this speeds up the simulation
}