// === Definições dos pinos ===
#define TRIG_PIN         23
#define ECHO_PIN         22
#define BUZZER_PIN       2

#define PIN_RED_LED      33
#define PIN_YELLOW_LED   32
#define PIN_LUZ1_LED     25  // Substituto de GPIO34 (agora funcional)
#define PIN_LUZ2_LED     26  // Substituto de GPIO35 (agora funcional)

#define LDR_ANALOG_PIN   36  // VP (A0)
#define LDR_DIGITAL_PIN  13  // D0

#define LDR_THRESHOLD    1000  // Ajustável
#define DIST_YELLOW      30    // cm
#define DIST_RED         15    // cm

long duration;
float distance_cm;

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

  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
  pinMode(BUZZER_PIN, OUTPUT);

  pinMode(PIN_RED_LED, OUTPUT);
  pinMode(PIN_YELLOW_LED, OUTPUT);
  pinMode(PIN_LUZ1_LED, OUTPUT);
  pinMode(PIN_LUZ2_LED, OUTPUT);

  pinMode(LDR_DIGITAL_PIN, INPUT);
}

void loop() {
  // === Medição de distância com o HC-SR04 ===
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);

  duration = pulseIn(ECHO_PIN, HIGH);
  distance_cm = duration * 0.01715;

  Serial.print("Distância: ");
  Serial.print(distance_cm);
  Serial.println(" cm");
  
if (distance_cm < DIST_RED) {
  digitalWrite(PIN_RED_LED, HIGH);
  digitalWrite(PIN_YELLOW_LED, LOW);
  tone(BUZZER_PIN, 1000); // som mais alto
} else if (distance_cm < DIST_YELLOW) {
  digitalWrite(PIN_RED_LED, LOW);
  digitalWrite(PIN_YELLOW_LED, HIGH);
  //tone(BUZZER_PIN, 500);  // som médio
} else {
  digitalWrite(PIN_RED_LED, LOW);
  digitalWrite(PIN_YELLOW_LED, LOW);
  noTone(BUZZER_PIN);
}

  // === Leitura do sensor LDR ===
  int ldrAnalog = analogRead(LDR_ANALOG_PIN);
  int ldrDigital = digitalRead(LDR_DIGITAL_PIN);

  Serial.print("LDR Analógico: ");
  Serial.println(ldrAnalog);
  Serial.print("LDR Digital: ");
  Serial.println(ldrDigital);

  // Acende os LEDs brancos se estiver escuro
if (ldrAnalog < LDR_THRESHOLD || ldrDigital == LOW) {
  digitalWrite(PIN_LUZ1_LED, HIGH);
  digitalWrite(PIN_LUZ2_LED, HIGH);
} else {
  digitalWrite(PIN_LUZ1_LED, LOW);
  digitalWrite(PIN_LUZ2_LED, LOW);
}


  delay(500);
}