int buzzerki=12;
int LEDred=10;
int LEDorange=7;
int LEDyellow=5;
int trigPin=8;
int echoPin=9;
#define pitch 500

long duration, distance;

void setup(){
  // put your setup here, to run once:
pinMode(LEDred, OUTPUT);
pinMode(LEDorange, OUTPUT);
pinMode(LEDyellow, OUTPUT);
pinMode(trigPin, OUTPUT);
pinMode(echoPin, INPUT);
Serial.begin(9600);
}
void loop() {
//put your main code here,to run repeatedly:

digitalWrite(trigPin, LOW);
delayMicroseconds(3);
digitalWrite(trigPin, HIGH);
delayMicroseconds(2);
digitalWrite(trigPin, LOW);
delayMicroseconds(3);
digitalWrite(trigPin, HIGH);
delayMicroseconds(2);

duration = pulseIn(echoPin, HIGH);
distance = duration *0.034/2;

Serial.print("distance ");
Serial.print(distance);
Serial.println("cm");


if(distance<40){
digitalWrite(LEDred, HIGH);
digitalWrite(LEDorange, HIGH);
digitalWrite(LEDyellow, HIGH);
tone(buzzerki, pitch);
delay(500);

digitalWrite(LEDred, LOW);
digitalWrite(LEDorange, LOW);
digitalWrite(LEDyellow, LOW);
noTone(buzzerki);
delay(500);
}
else{
digitalWrite(LEDred, LOW);
digitalWrite(LEDorange, LOW);
digitalWrite(LEDyellow, LOW);
noTone(buzzerki);
}

}