#define BUZZER_pin 11
#define trigr_pin 7
#define ECHO_PIN 6
void setup() {
  // put your setup code here, to run once:
 pinMode(BUZZER_pin, OUTPUT);
 pinMode(trigr_pin, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
}

void make_pulse(int pin)
{
  digitalWrite(pin, HIGH);
  delayMicroseconds(10);
  digitalWrite(pin, LOW);
}
void loop() {

  make_pulse(trigr_pin);

  int distance = pulseIn(ECHO_PIN,HIGH) / 58;
  if (distance < 100)
  {
    tone(BUZZER_pin, 256, 255);
    delay(500);

  }
  if (distance < 50)
  {
    tone(BUZZER_pin, 256);
    delay(500);

  }
  if (distance < 10)
  {
    tone(BUZZER_pin, 2506, 255);
    delay(500);

  }
}