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About DemoBoard_RangeIndicator

First published 19 Sep 2009, with 2 revisions since.
Last update: 22 Sep 2009.
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DemoBoard_RangeIndicator

Published 22 Sep 2009, by Chris Styles

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main.cpp

00001 #include "DemoBoard.h"
00002 
00003 /*
00004  * This project used and ultrasonic range finder to blend and RGB LED from
00005  * green to yellow to red as the ranged object gets closer
00006  */
00007 
00008 int main() {    
00009 
00010     while (1) {
00011     
00012         // Take a reading from the Ultrasonic Range Finder
00013         float d = srf;
00014         
00015         // Scale and trim the number so it approaches 0.0 at a long range
00016         // and approaches 1.0 as the range gets closer
00017         float normalised = (2.0/d) - 0.02;
00018         
00019         // Set the red component to get brighter the closer the range
00020         rgb.red(normalised);
00021         
00022         // Set the red component to get brighter the further the range
00023         rgb.green(1.0-normalised);
00024 
00025         // For completeness, print the measured range 
00026         pc.printf("Range is %.1f cm\n",(float)srf);
00027         wait (0.2);
00028   
00029     }
00030 
00031 }
00032 
00033