Nestor Pereira-Neto / HC-SR04

Biblioteca para uso do ultrassom HC-SR04

Dependents:   Sonar-HC-SR04 CarrinhoLabirinto Nucleo_Us_ticker_20160803 ProjetoSO ... more

HCSR04.cpp@4:be89035b2c42, 2017-05-16 (annotated)

Committer:
Nestordp
Date:
Tue May 16 01:53:19 2017 +0000
Revision:
4:be89035b2c42
Parent:
3:12d6d751f4fc 
atualiza??o de documenta??o

Who changed what in which revision?

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Nestordp 3:12d6d751f4fc 1 /**
Nestordp 3:12d6d751f4fc 2 * @author Nestor Pereira-Neto Team: SalvadorEngenharia
Nestordp 3:12d6d751f4fc 3 *
Nestordp 3:12d6d751f4fc 4 * @section LICENSE
Nestordp 3:12d6d751f4fc 5 *
Nestordp 3:12d6d751f4fc 6 * Copyright (c) 2010 ARM Limited
Nestordp 3:12d6d751f4fc 7 *
Nestordp 3:12d6d751f4fc 8 * Permission is hereby granted, free of charge, to any person obtaining a copy
Nestordp 3:12d6d751f4fc 9 * of this software and associated documentation files (the "Software"), to deal
Nestordp 3:12d6d751f4fc 10 * in the Software without restriction, including without limitation the rights
Nestordp 3:12d6d751f4fc 11 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
Nestordp 3:12d6d751f4fc 12 * copies of the Software, and to permit persons to whom the Software is
Nestordp 3:12d6d751f4fc 13 * furnished to do so, subject to the following conditions:
Nestordp 3:12d6d751f4fc 14 *
Nestordp 3:12d6d751f4fc 15 * The above copyright notice and this permission notice shall be included in
Nestordp 3:12d6d751f4fc 16 * all copies or substantial portions of the Software.
Nestordp 3:12d6d751f4fc 17 *
Nestordp 3:12d6d751f4fc 18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
Nestordp 3:12d6d751f4fc 19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
Nestordp 3:12d6d751f4fc 20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
Nestordp 3:12d6d751f4fc 21 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
Nestordp 3:12d6d751f4fc 22 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
Nestordp 3:12d6d751f4fc 23 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
Nestordp 3:12d6d751f4fc 24 * THE SOFTWARE.
Nestordp 3:12d6d751f4fc 25 *
Nestordp 3:12d6d751f4fc 26 * @section DESCRIPTION
Nestordp 3:12d6d751f4fc 27 *
Nestordp 3:12d6d751f4fc 28 * Biblioteca para uso do sonar HC-SR04, possui rotinas para permitir medições
Nestordp 3:12d6d751f4fc 29 * de distências retornado valores em centímetros, polegadas ou o tempo
Nestordp 3:12d6d751f4fc 30 * percorrido pelo som (em microsegundos).
Nestordp 3:12d6d751f4fc 31 * Esta biblioteca pode ser usada com qualquer pino do microcontrolador.
Nestordp 3:12d6d751f4fc 32 */
Nestordp 3:12d6d751f4fc 33
Nestordp 3:12d6d751f4fc 34
Nestordp 0:d1d7bb1c1f6c 35 #include "HCSR04.h"
Nestordp 0:d1d7bb1c1f6c 36 #include "mbed.h"
Nestordp 0:d1d7bb1c1f6c 37
Nestordp 0:d1d7bb1c1f6c 38
Nestordp 0:d1d7bb1c1f6c 39 HCSR04::HCSR04(PinName trigger, PinName echo) : _t(trigger), _e(echo) {
Nestordp 0:d1d7bb1c1f6c 40 wait(0.1);
Nestordp 0:d1d7bb1c1f6c 41 }
Nestordp 0:d1d7bb1c1f6c 42
Nestordp 0:d1d7bb1c1f6c 43 float HCSR04::getCm(void){
Nestordp 0:d1d7bb1c1f6c 44 distcm = readEcho()/58;
Nestordp 0:d1d7bb1c1f6c 45 return distcm;
Nestordp 0:d1d7bb1c1f6c 46 }
Nestordp 0:d1d7bb1c1f6c 47
Nestordp 0:d1d7bb1c1f6c 48 float HCSR04::getIn(void){
Nestordp 0:d1d7bb1c1f6c 49 distin = readEcho()/148;
Nestordp 0:d1d7bb1c1f6c 50 return distin;
Nestordp 0:d1d7bb1c1f6c 51 }
Nestordp 0:d1d7bb1c1f6c 52
Nestordp 0:d1d7bb1c1f6c 53 float HCSR04::readEcho(void){
Nestordp 0:d1d7bb1c1f6c 54 _t=1; //Inicio do trigger
Nestordp 0:d1d7bb1c1f6c 55 wait_us(10); //10us de pulso
Nestordp 0:d1d7bb1c1f6c 56 _t=0; //Fim do trigger
Nestordp 0:d1d7bb1c1f6c 57 while(!_e);
Nestordp 0:d1d7bb1c1f6c 58 _tempo.start();
Nestordp 0:d1d7bb1c1f6c 59 while(_e);
Nestordp 0:d1d7bb1c1f6c 60 tdist = _tempo.read_us(); //Leitura do tempo transcorrido
Nestordp 0:d1d7bb1c1f6c 61 _tempo.stop(); //Paro o temporizador
Nestordp 0:d1d7bb1c1f6c 62 _tempo.reset(); //Reset para o próximo ciclo
Nestordp 0:d1d7bb1c1f6c 63 return tdist;
Nestordp 0:d1d7bb1c1f6c 64 }