Create rangefinder.ino

a21-rangefinder/rangefinder.ino

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+//T4A01-RangeFinder-Name.ino 
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+
+
+// EXAMPLE 
+
+//using Ultrasonic Range Finder from Robotshop 
+
+//http://www.robotshop.com/ca/en/hc-sr04-ultrasonic-range-finder.html 
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+
+
+unsigned long duration; 
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+
+
+void setup() 
+
+{ 
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+
+
+    pinMode(D7, OUTPUT);   // LED on D7 
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+    pinMode(D1, OUTPUT);   // Other LED connected from D1 through resistor to ground 
+
+
+
+                           // ultrasonic range finder Robotshop RB-lte-54 
+
+
+
+                           // GND pin goes to ground 
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+    pinMode(D6, INPUT);    // echo 
+
+    pinMode(D2, OUTPUT);   // Trig 
+
+                           // VCC pin goes to VIN on the photon 
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+
+
+} 
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+
+
+void loop(){ 
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+
+
+        delay(10);                      // even cicuits need a break 
+
+        digitalWrite(D2, HIGH);         // activate trigger 
+
+        delayMicroseconds(10); 
+
+        digitalWrite(D2, LOW);          // de-activate trigger 
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+
+
+        duration = pulseIn(D6, HIGH);   // how long until a reply? 
+
+                                        // a blocking call so may wait a few seconds 
+
+
+
+        if (duration > 2000    ){        // raw data from 200 to 16000                                          
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+                                        // where  2000 raw = ~35cm,  4000 raw = ~80cm                                    
+
+            digitalWrite(D7, HIGH);     // D7 Blue LED on if far 
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+            digitalWrite(D1, LOW);      // Other LED off 
+
+        } else { 
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+            digitalWrite(D7, LOW);      // D7 Blue LED off 
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+            digitalWrite(D1, HIGH);     // Other LED on if Close 
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+
+
+        }  
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+}