Alternate Version

Sonar/Sonar.ino

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+#define trigPin 12
+#define echoPin 13
+#define beepPin 10
+#define scalingfactor 50
+
+int inches = 0;
+unsigned long duration = 0;
+unsigned long maxtime = 1000;
+unsigned long i = 1;
+unsigned long time2 = 0;
+unsigned long time1 = 0;
+
+void setup(){
+  pinMode(trigPin, OUTPUT);
+  pinMode(echoPin, INPUT);
+  pinMode(beepPin, OUTPUT);
+}
+
+void logdistance(){
+  time1 = millis();
+  digitalWrite(trigPin, HIGH);
+  delayMicroseconds(10);
+  digitalWrite(trigPin, LOW);
+  duration = pulseIn(echoPin, HIGH);
+  inches = duration/148;
+  time2 = millis();
+  maxtime = scalingfactor*inches;
+}
+
+void delayandcheckdistance(){
+  i=1;
+  while(1){
+    if (i % 60 == 0){
+      logdistance();
+    }
+    delay(1);
+    ++i;
+    if (i >= maxtime){
+      break;
+    }
+  }
+}
+
+void beep(){
+  digitalWrite(beepPin, HIGH);
+  delay(90);
+  logdistance();
+  if(time2-time1 < 30){
+    delay(60-(time2-time1));
+  }
+  digitalWrite(beepPin, LOW);
+}
+
+void loop(){
+  beep();
+  delayandcheckdistance();
+}
+

Sonar/liink.txt

@@ -0,0 +1 @@
+http://clone.tinkernut.com/portfolio/make-sonar-device/#lightbox[9247]/0/