V1
Dependencies: simple-mbed-client
hcsr04.cpp
- Committer:
- johnlynam2014
- Date:
- 2017-03-07
- Revision:
- 1:bb3336b7e953
File content as of revision 1:bb3336b7e953:
#include "hcsr04.h" #include "mbed.h" /* *HCSR04.cpp */ HCSR04::HCSR04(PinName t, PinName e) : trig(t), echo(e) {} long HCSR04::echo_duration() { timer.reset(); //reset timer trig=0; // trigger low wait_us(2); // wait trig=1; // trigger high wait_us(10); trig=0; // trigger low while(!echo); // start pulseIN timer.start(); while(echo); timer.stop(); return timer.read_us(); } //return distance in cm long HCSR04::distance(){ duration = echo_duration(); distance_cm = (duration/2)/29.1; return distance_cm; }