====== SONAR Pmod controler ======

The module described here makes it possible to retreive the distance detected by the proximity detector PmodSONAR.

{{ :en202:pmodsonar_symbol.png?direct&600 |}}
({{:en202:pmodsonar_symbol.vsd | figure source}})
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This module constantly outputs the distance measured by the SONAR Pmod. The output value (//data_out//) roughly changes each 49//ms// and is always valid. It represents the distance beween the SONAR Pmod and the closest obstacle expressed in //inches// (2.54//cm//). //data_out// is 8 bits unsigned, so the maximal measurable distance is 255//in//.

If the obstacle is closer than 6//in//, the Pmod output is unstable and meaningless (generally equal to 5 or 6)

  * {{ en202:pmod_SONAR_ctrl.vhd | controler module}}
  * {{ https://www.digilentinc.com/Data/Products/PMOD-MAXSONAR/PmodMAXSONAR_rm2.pdf | Pmod Datasheet }}