Class library for a HC-SR04 Distance Sensor based on PwmOut (Trig) and InterruptIn (Echo).
Dependents: ultra TDPS-COM1 HCSR04
HCSR04.cpp
- Committer:
- grantphillips
- Date:
- 2016-02-08
- Revision:
- 1:8286d0de19ce
- Parent:
- 0:5541303b14e7
File content as of revision 1:8286d0de19ce:
#include "HCSR04.h" #include "mbed.h" HCSR04::HCSR04(PinName t, PinName e) : trig(t), echo(e) { trig.period(0.06); trig.pulsewidth_us(20); echo.rise(this,&HCSR04::HighTrigger); echo.fall(this,&HCSR04::LowTrigger); } unsigned int HCSR04::read_us() { return us; } float HCSR04::read_cm() { return (float)us/58; } void HCSR04::HighTrigger() { timer.start(); } void HCSR04::LowTrigger() { timer.stop(); us = timer.read_us(); timer.reset(); }