Car Parking Sensor

1int trigPin = 7; //Here are the locations of pins
2int echoPin = 4;
3int
4  buzzerPin = 9; 
5int ledPin = 6;
6int time;		//Teaching the time and distance
7  to machine
8int distance; 
9
10void setup()
11{
12 pinMode(trigPin, OUTPUT);
13  // sets the trigger pin as an output (sends wave out) 
14 pinMode(echoPin, INPUT);
15  // sets the echo pin as the input (receives the echoed sound wave)
16 pinMode (buzzerPin,
17  OUTPUT); // sets the buzzer as an output
18 pinMode(ledPin, OUTPUT);
19}
20
21void
22  loop()
23{
24 digitalWrite(trigPin, HIGH); //sound waves emitted
25 delayMicroseconds(5);
26  // leave on for 5 us
27 digitalWrite(trigPin, LOW); // turn off emitter
28 int
29  time = pulseIn(echoPin, HIGH); // turn on echo detector
30 int distance = (time*0.034)/2;
31  // speed of sound in air is 340 m/s = 0.034 cm/us. Dividing this value by 2 gives
32  us the distance from the sensor to the object 
33
34if (distance <= 30) {     //
35  if the distance calculates is less than or equal to 30, the buzzer sounds and led
36  blinks
37
38        digitalWrite (buzzerPin, HIGH);
39		digitalWrite(ledPin,
40  HIGH);
41        delay (200);
42
43        }
44
45  else {                 //
46  if the distance calculated is greater than 30 cm, buzzer is not turned on and the
47  led doesnt blink
48    
49        digitalWrite (buzzerPin, LOW);
50		digitalWrite(ledPin,
51  LOW);
52        delay (200);  
53  }
54}
55
56
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58

1int trigPin = 7; //Here are the locations of pins
2int echoPin = 4;
3int  buzzerPin = 9; 
4int ledPin = 6;
5int time;		//Teaching the time and distance  to machine
6int distance; 
7
8void setup()
9{
10 pinMode(trigPin, OUTPUT);  // sets the trigger pin as an output (sends wave out) 
11 pinMode(echoPin, INPUT);  // sets the echo pin as the input (receives the echoed sound wave)
12 pinMode (buzzerPin,  OUTPUT); // sets the buzzer as an output
13 pinMode(ledPin, OUTPUT);
14}
15
16void  loop()
17{
18 digitalWrite(trigPin, HIGH); //sound waves emitted
19 delayMicroseconds(5);  // leave on for 5 us
20 digitalWrite(trigPin, LOW); // turn off emitter
21 int  time = pulseIn(echoPin, HIGH); // turn on echo detector
22 int distance = (time*0.034)/2;  // speed of sound in air is 340 m/s = 0.034 cm/us. Dividing this value by 2 gives  us the distance from the sensor to the object 
23
24if (distance <= 30) {     //  if the distance calculates is less than or equal to 30, the buzzer sounds and led  blinks
25
26        digitalWrite (buzzerPin, HIGH);
27		digitalWrite(ledPin,  HIGH);
28        delay (200);
29
30        }
31
32  else {                 //  if the distance calculated is greater than 30 cm, buzzer is not turned on and the  led doesnt blink
33    
34        digitalWrite (buzzerPin, LOW);
35		digitalWrite(ledPin,  LOW);
36        delay (200);  
37  }
38}
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42