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| | | Ultrasonic sensors can detect distances to a high degree of accuracy, even |
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| | | in many conditions where infrared sensors would not be suitable (e.g.: when natural |
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| | | light is a problem. |
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| | | For this example we used the [HC-SR04](https://cdn.sparkfun.com/datasheets/Sensors/Proximity/HCSR04.pdf). |
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| | | light is a problem. For this example we used the [Grove Ultrasonic Ranger] |
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| | | (https://wiki.seeedstudio.com/Grove-Ultrasonic_Ranger/). |
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| | | After it receives a short pulse (> 10us) at its TRIGGER input, the module outputs from the |
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| | | ECHO output a pulse whose length is proportional to the distance of the object that is in |
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| | | PulseIn pulseIn; |
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| | | Scope scope; |
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| | | int sensorFreq = 10; // freq in Hz |
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| | | int sensorFreq = 10; // freq in Hz for polling value and sending OSC messages |
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| | | int gTriggerInterval = 44100 / sensorFreq; // how often to send out a trigger. 2646 samples are 60ms |
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| | | int gMinPulseLength = 7; //to avoid spurious readings |
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| | | float gRescale = 58; // taken from the datasheet |
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