Kart/sensors/HCSR04

(Difference between revisions)
Jump to: navigation, search
(Ultrasound ranger)
(Ultrasound ranger)
Line 15: Line 15:
  
 
:: <math>distance = count \cdot 0.0017 ~ [cm]</math>
 
:: <math>distance = count \cdot 0.0017 ~ [cm]</math>
 +
 +
There is approximately 500 us between the trigger and the start of the answer. Moreover, for ranges of about 20-30 cm, the return signal duration is of an order of 2-3 ms. Thus, going above below 10 ms (100Hz) for the whole measure is not a good idea.
  
 
[[Category:Kart]]
 
[[Category:Kart]]

Revision as of 08:08, 20 August 2015

Contents

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.

Ultrasound ranger.svg

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]

There is approximately 500 us between the trigger and the start of the answer. Moreover, for ranges of about 20-30 cm, the return signal duration is of an order of 2-3 ms. Thus, going above below 10 ms (100Hz) for the whole measure is not a good idea.

Personal tools
Namespaces
Variants
Actions
Navigation
Modules / Projects
Browse
Toolbox