HCSR04.h

00001 //Library for controlling ultrasonic module HCSR04
00002 //Ported by hiawoood from arduino library orgininally created by ITead studio.
00003 //Instantiate object by supplying the proper pin numbers of "trigger" and "echo"
00004 //e.g. 
00005 /*
00006         int main() {
00007             Ultrasonic sensor(p5, p6);
00008             while(1){
00009                 long distance = sensor.distance(CM);
00010                 printf("Distance:%d\n");
00011                 wait(0.1);
00012             }
00013         }
00014 */
00015 
00016 
00017 
00018 #ifndef HCSR04_H
00019 #define HCSR04_H
00020 
00021 #include "mbed.h"
00022 
00023 #define CM 1
00024 #define INC 0
00025 
00026 class HCSR04 {
00027   public:
00028     HCSR04(PinName t, PinName e);
00029     float echo_duration();
00030     float distance(int sys);
00031 
00032     private:
00033         DigitalOut trig;
00034         DigitalIn echo;
00035         Timer timer;
00036         float duration,distacne_cm,distance_inc;
00037 };
00038 
00039 #endif