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Coursework
hcsr04.cpp
- Committer:
- sesa514652
- Date:
- 2021-12-16
- Revision:
- 0:1f799c7cce2b
File content as of revision 0:1f799c7cce2b:
#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; }