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@0:d1d7bb1c1f6c, 2015-02-05 (annotated)

Committer:
Nestordp
Date:
Thu Feb 05 19:00:51 2015 +0000
Revision:
0:d1d7bb1c1f6c
Child:
2:9daf23ed9d84
Child:
3:12d6d751f4fc
Biblioteca para uso do sonar HC-SR04, implementado na FRDM-LZ25Z

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Nestordp 0:d1d7bb1c1f6c 1 #include "HCSR04.h"
Nestordp 0:d1d7bb1c1f6c 2 #include "mbed.h"
Nestordp 0:d1d7bb1c1f6c 3
Nestordp 0:d1d7bb1c1f6c 4
Nestordp 0:d1d7bb1c1f6c 5 HCSR04::HCSR04(PinName trigger, PinName echo) : _t(trigger), _e(echo) {
Nestordp 0:d1d7bb1c1f6c 6 wait(0.1);
Nestordp 0:d1d7bb1c1f6c 7 }
Nestordp 0:d1d7bb1c1f6c 8
Nestordp 0:d1d7bb1c1f6c 9 float HCSR04::getCm(void){
Nestordp 0:d1d7bb1c1f6c 10 distcm = readEcho()/58;
Nestordp 0:d1d7bb1c1f6c 11 return distcm;
Nestordp 0:d1d7bb1c1f6c 12 }
Nestordp 0:d1d7bb1c1f6c 13
Nestordp 0:d1d7bb1c1f6c 14 float HCSR04::getIn(void){
Nestordp 0:d1d7bb1c1f6c 15 distin = readEcho()/148;
Nestordp 0:d1d7bb1c1f6c 16 return distin;
Nestordp 0:d1d7bb1c1f6c 17 }
Nestordp 0:d1d7bb1c1f6c 18
Nestordp 0:d1d7bb1c1f6c 19 float HCSR04::readEcho(void){
Nestordp 0:d1d7bb1c1f6c 20 _t=1; //Inicio do trigger
Nestordp 0:d1d7bb1c1f6c 21 wait_us(10); //10us de pulso
Nestordp 0:d1d7bb1c1f6c 22 _t=0; //Fim do trigger
Nestordp 0:d1d7bb1c1f6c 23 while(!_e);
Nestordp 0:d1d7bb1c1f6c 24 _tempo.start();
Nestordp 0:d1d7bb1c1f6c 25 while(_e);
Nestordp 0:d1d7bb1c1f6c 26 tdist = _tempo.read_us(); //Leitura do tempo transcorrido
Nestordp 0:d1d7bb1c1f6c 27 _tempo.stop(); //Paro o temporizador
Nestordp 0:d1d7bb1c1f6c 28 _tempo.reset(); //Reset para o próximo ciclo
Nestordp 0:d1d7bb1c1f6c 29 return tdist;
Nestordp 0:d1d7bb1c1f6c 30 }