#define ECHO_PIN 2
#define TRIG_PIN 5

void setup() {
  Serial.begin(115200);
  pinMode(13, OUTPUT);
  pinMode(12, OUTPUT);
  pinMode(11, OUTPUT);
  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
}

float readDistanceCM() {
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);
  int duration = pulseIn(ECHO_PIN, HIGH);
  return duration * 0.034 / 2;
}

void loop() {
  float distance = readDistanceCM();

  bool isNearby = distance < 300;
  bool isNear = distance < 200;
  bool AAAaaA = distance < 100;
  digitalWrite(13, isNearby);
  digitalWrite(12, isNear);
  digitalWrite(11, AAAaaA);
  if (distance < 10) {
    tone(8, 1100, 250);
  } else if (distance < 50) {
    tone(8, 1050, 250);
  } else if (distance < 100) {
    tone(8, 1000, 250);
  } else if (distance < 150) {
    tone(8, 950, 250);
  } else if (distance < 200) {
    tone(8, 900, 250);
  } else if (distance < 250) {
    tone(8, 850, 250);
  } else if (distance < 300) {
    tone(8, 800, 250);
  }

  Serial.print("Measured distance: ");
  Serial.println(distance);

  delay(100);
}