Ping Sensor

1#define trigPin 12
2#define echoPin 11
3#define MAX_DISTANCE 200
4//  define the timeOut according the maximum range. time out= 2*MAX_DISTANCE /100 /340  *1000000 = MAX_DISTANCE*58.8
5float timeOut = MAX_DISTANCE * 60;
6int soundVelocity  = 340;
7void setup() {
8  pinMode(trigPin, OUTPUT);
9  pinMode(echoPin, INPUT);
10  Serial.begin(9600);
11}
12void loop() {
13  delay(100);
14  Serial.print("Ping:  ");
15  Serial.print(getSonar());
16  Serial.println("cm");
17}
18float getSonar()  {
19  unsigned long pingTime;
20  float distance;
21  digitalWrite(trigPin, HIGH);
22  delayMicroseconds(10);
23  digitalWrite(trigPin, LOW);
24  pingTime = pulseIn(echoPin,  HIGH, timeOut);
25  distance = (float)pingTime * soundVelocity / 2 / 10000;
26  return distance;
27}
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