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2fa8deb92d
Compilation still has problems (Thread error on success, and can't handle non-pde files in a sketch). Modified the Mac OS X make.sh to copy the hardware, avr tools, and example over. Removing some of the antlr stuff. Disabling the Commander (command-line execution) for now. Added Library, LibraryManager, and Target. Added support for prefixed preferences (e.g. for boards and programmers).
57 lines
1.6 KiB
Plaintext
57 lines
1.6 KiB
Plaintext
int pingPin = 7;
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void setup()
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{
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Serial.begin(9600);
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}
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void loop()
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{
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long duration, inches, cm;
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// The PING))) is triggered by a HIGH pulse of 2 or more microseconds.
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// We give a short LOW pulse beforehand to ensure a clean HIGH pulse.
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pinMode(pingPin, OUTPUT);
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digitalWrite(pingPin, LOW);
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delayMicroseconds(2);
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digitalWrite(pingPin, HIGH);
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delayMicroseconds(5);
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digitalWrite(pingPin, LOW);
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// The same pin is used to read the signal from the PING))): a HIGH
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// pulse whose duration is the time (in microseconds) from the sending
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// of the ping to the reception of its echo off of an object.
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pinMode(pingPin, INPUT);
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duration = pulseIn(pingPin, HIGH);
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// convert the time into a distance
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inches = microsecondsToInches(duration);
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cm = microsecondsToCentimeters(duration);
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Serial.print(inches);
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Serial.print("in, ");
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Serial.print(cm);
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Serial.print("cm");
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Serial.println();
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delay(100);
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}
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long microsecondsToInches(long microseconds)
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{
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// According to Parallax's datasheet for the PING))), there are
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// 73.746 microseconds per inch (i.e. sound travels at 1130 feet per
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// second). This gives the distance travelled by the ping, outbound
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// and return, so we divide by 2 to get the distance of the obstacle.
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// See: http://www.parallax.com/dl/docs/prod/acc/28015-PING-v1.3.pdf
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return microseconds / 74 / 2;
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}
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long microsecondsToCentimeters(long microseconds)
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{
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// The speed of sound is 340 m/s or 29 microseconds per centimeter.
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// The ping travels out and back, so to find the distance of the
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// object we take half of the distance travelled.
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return microseconds / 29 / 2;
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}
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