Kart/sensors/HCSR04

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Ultrasound ranger

The elecfreaks Ultrasonic sensor distance measuring module receives a trigger pulse, sends an ultrasonic pulse train and the provides a pulse whose length is proportional to the sound flight and echo time.

It has a dedicated connector on the I/O board.

The ultrasoundRanger block in the sensors FPGA counts the ultrasonic pulse length in terms of the 10 MHz clock periods. The distance is thus given by:

distance = \frac{580}{count} ~ [cm]
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