a b / Mbed 2 deprecated EL_CODIGO_ASPI-01

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Dependencies:   mbed

HCSR04/hcsr04.cpp@0:0f497d629677, 2020-11-19 (annotated)

Committer:
grupo_17_2020
Date:
Thu Nov 19 12:07:27 2020 +0000
Revision:
0:0f497d629677
el codigo completo del Asistente de Servicio Personal Interaccional - 01

Who changed what in which revision?

UserRevisionLine numberNew contents of line
grupo_17_2020 0:0f497d629677 1 #include "hcsr04.h"
grupo_17_2020 0:0f497d629677 2 #include "mbed.h"
grupo_17_2020 0:0f497d629677 3 /*
grupo_17_2020 0:0f497d629677 4 *HCSR04.cpp
grupo_17_2020 0:0f497d629677 5 */
grupo_17_2020 0:0f497d629677 6 HCSR04::HCSR04(PinName t, PinName e) : trig(t), echo(e) {}
grupo_17_2020 0:0f497d629677 7 long HCSR04::echo_duration() {
grupo_17_2020 0:0f497d629677 8
grupo_17_2020 0:0f497d629677 9 timer.reset(); //reset timer
grupo_17_2020 0:0f497d629677 10 trig=0; // trigger low
grupo_17_2020 0:0f497d629677 11 wait_us(2); // wait
grupo_17_2020 0:0f497d629677 12 trig=1; // trigger high
grupo_17_2020 0:0f497d629677 13 wait_us(10);
grupo_17_2020 0:0f497d629677 14 trig=0; // trigger low
grupo_17_2020 0:0f497d629677 15 while(!echo); // start pulseIN
grupo_17_2020 0:0f497d629677 16 timer.start();
grupo_17_2020 0:0f497d629677 17 while(echo);
grupo_17_2020 0:0f497d629677 18 timer.stop();
grupo_17_2020 0:0f497d629677 19 return timer.read_us();
grupo_17_2020 0:0f497d629677 20
grupo_17_2020 0:0f497d629677 21 }
grupo_17_2020 0:0f497d629677 22
grupo_17_2020 0:0f497d629677 23 //return distance in cm
grupo_17_2020 0:0f497d629677 24 long HCSR04::distance(){
grupo_17_2020 0:0f497d629677 25 duration = echo_duration();
grupo_17_2020 0:0f497d629677 26 distance_cm = (duration/2)/29.1 ;
grupo_17_2020 0:0f497d629677 27 return distance_cm;
grupo_17_2020 0:0f497d629677 28
grupo_17_2020 0:0f497d629677 29 }