temperature and distance
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Diff: hcsr04.cpp
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- 0:3f335fc50cef
diff -r 000000000000 -r 3f335fc50cef hcsr04.cpp --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/hcsr04.cpp Sun May 24 20:45:32 2015 +0000 @@ -0,0 +1,105 @@ +/* Copyright (c) 2013 Prabhu Desai + * pdtechworld@gmail.com + * + * Permission is hereby granted, free of charge, to any person obtaining a copy of this software + * and associated documentation files (the "Software"), to deal in the Software without restriction, + * including without limitation the rights to use, copy, modify, merge, publish, distribute, + * sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in all copies or + * substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING + * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, + * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. + */ + + +#include "hcsr04.h" + + +HCSR04::HCSR04(PinName TrigPin,PinName EchoPin): + trigger(TrigPin), echo(EchoPin), maxpulse(-1) +{ + pulsetime.stop(); + pulsetime.reset(); + echo.rise(this,&HCSR04::isr_rise); + echo.fall(this,&HCSR04::isr_fall); + trigger=0; +} + +HCSR04::~HCSR04() +{ +} + +void HCSR04::isr_rise(void) +{ + pulsetime.start(); + pulsetime.reset(); +} +void HCSR04::start(void) +{ + pulsedur = -1; + + trigger=1; + wait_us(10); + trigger=0; +} + +void HCSR04::isr_fall(void) +{ + pulsetime.stop(); + pulsedur = pulsetime.read_us(); + if (pulsedur > maxpulse && pulsedur < kBogusPulse) + maxpulse = pulsedur; +} + +void HCSR04::rise (void (*fptr)(void)) +{ + echo.rise(fptr); +} +void HCSR04::fall (void (*fptr)(void)) +{ + echo.fall(fptr); +} + +double HCSR04::get_dist_cm() +{ + return pulsedur * kMicrosecondsToCentimeters; +} +double HCSR04::get_max_dist_cm() +{ + return maxpulse * kMicrosecondsToCentimeters; +} +int HCSR04::get_pulse_us() +{ + return pulsedur; +} + + + +/******************************************************* + Here is a sample code usage +********************************************************* +#include "hcsr04.h" +HCSR04 usensor(p25,p6); +int main() +{ + unsigned char count=0; + while(1) { + usensor.start(); + wait_ms(500); + dist=usensor.get_dist_cm(); + lcd.cls(); + lcd.locate(0,0); + lcd.printf("cm:%ld",dist ); + + count++; + lcd.locate(0,1); + lcd.printf("Distance =%d",count); + + } +*/ \ No newline at end of file