Proximity Detector Alarm

1#define trigPin 13
2#define echoPin 12
3#define speaker 11
4#define   led2 10
5
6void setup() {
7  Serial.begin (9600);
8  pinMode(trigPin, OUTPUT);
9   pinMode(echoPin, INPUT);
10  pinMode(speaker, OUTPUT);
11  pinMode(led2, OUTPUT);
12}
13
14void   loop() {
15  long duration, distance;
16  digitalWrite(trigPin, LOW);  
17  delayMicroseconds(2);   
18  digitalWrite(trigPin, HIGH);
19  delayMicroseconds(10); 
20  digitalWrite(trigPin,   LOW);
21  duration = pulseIn(echoPin, HIGH);
22  distance = (duration/2) / 29.1;
23   if (distance < 192) {  // set your distance
24  tone(speaker,7); 
25  digitalWrite(led2,HIGH);
26}
27   
28  delay(50); //change the rate at which the speaker pings
29}
30

1#define trigPin 13
2#define echoPin 12
3#define speaker 11
4#define  led2 10
5
6void setup() {
7  Serial.begin (9600);
8  pinMode(trigPin, OUTPUT);
9  pinMode(echoPin, INPUT);
10  pinMode(speaker, OUTPUT);
11  pinMode(led2, OUTPUT);
12}
13
14void  loop() {
15  long duration, distance;
16  digitalWrite(trigPin, LOW);  
17  delayMicroseconds(2);  
18  digitalWrite(trigPin, HIGH);
19  delayMicroseconds(10); 
20  digitalWrite(trigPin,  LOW);
21  duration = pulseIn(echoPin, HIGH);
22  distance = (duration/2) / 29.1;
23  if (distance < 192) {  // set your distance
24  tone(speaker,7); 
25  digitalWrite(led2,HIGH);
26}
27  
28  delay(50); //change the rate at which the speaker pings
29}
30