1.   const int trigPin = 12;
2.   const int echoPin = 13;
3.  
4.   long duration;
5.   int distance;
6.  
7. void setup() {
8.  
9.   pinMode(trigPin, OUTPUT);
10.   pinMode(echoPin, INPUT);
11.   pinMode(11, OUTPUT);
12.   pinMode(10, OUTPUT);
13.   pinMode(9, OUTPUT);
14.   Serial.begin(9600);
15.  
16. }
17.  
18. void loop() {
19.  
20.   digitalWrite(trigPin, LOW);
21.   delayMicroseconds(2);
22.  
23.   digitalWrite(trigPin, HIGH);
24.   delayMicroseconds(10);
25.   digitalWrite(trigPin, LOW);
26.  
27.   duration = pulseIn(echoPin, HIGH);
28.  
29.   distance= duration*0.034/2;
30.  
31.   Serial.print("Distance: ");
32.   Serial.println(distance);
33. /*
34.   if(distance<10){
35.     analogWrite(9, 255);
36.     analogWrite(10,0);
37.     analogWrite(11,0);
38.   }
39.   if(distance < 15 && distance >= 10){
40.     analogWrite(9,255);
41.     analogWrite(10,255);
42.     analogWrite(11,0);
43.   }
44.   if(distance < 20 && distance >=15){
45.     analogWrite(9,255);
46.     analogWrite(10,255);
47.     analogWrite(11,0);
48.   }
49.   if(distance >=25)
50.     analogWrite(11,0);
51.     analogWrite(10,255);
52.     analogWrite(9,0);
53. */
54.  
55.   if(disctance)
56. }
57.