Jexus Chuang
/
HC-SR04-another
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Diff: HCSR04.cpp
- Revision:
- 0:d1d7bb1c1f6c
- Child:
- 2:9daf23ed9d84
- Child:
- 3:12d6d751f4fc
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/HCSR04.cpp Thu Feb 05 19:00:51 2015 +0000
@@ -0,0 +1,30 @@
+#include "HCSR04.h"
+#include "mbed.h"
+
+
+HCSR04::HCSR04(PinName trigger, PinName echo) : _t(trigger), _e(echo) {
+ wait(0.1);
+ }
+
+float HCSR04::getCm(void){
+ distcm = readEcho()/58;
+ return distcm;
+ }
+
+float HCSR04::getIn(void){
+ distin = readEcho()/148;
+ return distin;
+ }
+
+float HCSR04::readEcho(void){
+ _t=1; //Inicio do trigger
+ wait_us(10); //10us de pulso
+ _t=0; //Fim do trigger
+ while(!_e);
+ _tempo.start();
+ while(_e);
+ tdist = _tempo.read_us(); //Leitura do tempo transcorrido
+ _tempo.stop(); //Paro o temporizador
+ _tempo.reset(); //Reset para o próximo ciclo
+ return tdist;
+}
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