not mine
Dependents: EE3023DistanceSensor EE3023DistanceSensor3 EE3023CarSafetySystem EE3023CarSafetySystem
Revision 0:68251ad692dd, committed 2020-12-16
- Comitter:
- fiachra
- Date:
- Wed Dec 16 17:17:42 2020 +0000
- Commit message:
- libraries created;
Changed in this revision
hcsr04.cpp | Show annotated file Show diff for this revision Revisions of this file |
hcsr04.h | Show annotated file Show diff for this revision Revisions of this file |
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/hcsr04.cpp Wed Dec 16 17:17:42 2020 +0000 @@ -0,0 +1,98 @@ +/* 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) +{ + 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(); +} +void HCSR04::start(void) +{ + trigger=1; + wait_us(10); + trigger=0; +} + +void HCSR04::isr_fall(void) +{ + pulsetime.stop(); + pulsedur = pulsetime.read_us(); + distance= (pulsedur*343)/20000; + pulsetime.reset(); +} + +void HCSR04::rise (void (*fptr)(void)) +{ + echo.rise(fptr); +} +void HCSR04::fall (void (*fptr)(void)) +{ + echo.fall(fptr); +} + +unsigned int HCSR04::get_dist_cm() +{ + return distance; +} +unsigned 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
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/hcsr04.h Wed Dec 16 17:17:42 2020 +0000 @@ -0,0 +1,68 @@ +/* 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. + * + * For more details on the sensor : + * http://www.elecfreaks.com/store/hcsr04-ultrasonic-sensor-distance-measuring-module-p-91.html?zenid=pgm8pgnvaodbe36dibq5s1soi3 + * + * 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. + */ + +#ifndef MBED_HCSR04_H +#define MBED_HCSR04_H + +#include "mbed.h" + +/** HCSR04 Class(es) + */ + +class HCSR04 +{ +public: + /** Create a HCSR04 object connected to the specified pin + * @param pin i/o pin to connect to + */ + HCSR04(PinName TrigPin,PinName EchoPin); + ~HCSR04(); + + /** Return the distance from obstacle in cm + * @param distance in cms and returns -1, in case of failure + */ + unsigned int get_dist_cm(void); + /** Return the pulse duration equal to sonic waves travelling to obstacle and back to receiver. + * @param pulse duration in microseconds. + */ + unsigned int get_pulse_us(void); + /** Generates the trigger pulse of 10us on the trigger PIN. + */ + void start(void ); + void isr_rise(void); + void isr_fall(void); + void fall (void (*fptr)(void)); + void rise (void (*fptr)(void)); + + + +private: + + Timer pulsetime; + DigitalOut trigger; + InterruptIn echo; + unsigned int pulsedur; + unsigned int distance; +}; + +#endif \ No newline at end of file