Kart/sensors/HCSR04
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The [http://www.elecfreaks.com elecfreaks] | The [http://www.elecfreaks.com elecfreaks] | ||
[http://www.elecfreaks.com/store/hcsr04-ultrasonic-sensor-distance-measuring-module-ultra01-p-91.html Ultrasonic sensor distance measuring module] | [http://www.elecfreaks.com/store/hcsr04-ultrasonic-sensor-distance-measuring-module-ultra01-p-91.html Ultrasonic sensor distance measuring module] | ||
| − | receives a trigger pulse, sends an ultrasonic pulse train and | + | receives a trigger pulse, <code>startMeasure</code>, sends an ultrasonic pulse train |
| + | and then provides a pulse, <code>distancePulse</code>, whose length is proportional to the sound flight and echo time. | ||
| + | |||
| + | [[File:Ultrasound ranger.svg|center|500px]] | ||
It has a dedicated [[Kart/sensor board#Ultrasound ranger|connector]] on the [[Kart/sensor board|I/O board]]. | It has a dedicated [[Kart/sensor board#Ultrasound ranger|connector]] on the [[Kart/sensor board|I/O board]]. | ||
Revision as of 13:56, 19 August 2015
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Ultrasound ranger
The elecfreaks
Ultrasonic sensor distance measuring module
receives a trigger pulse, startMeasure, sends an ultrasonic pulse train
and then provides a pulse, distancePulse, 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 = count \cdot 0.0017 ~ [cm]](/fsi/images/math/5/e/6/5e69e121393e982f9564230d8f381d46.png)
