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Proof of concept for distance and temperature monitoring
Dependencies: mbed mbedConnectorInterface mbedEndpointNetwork
hcsr04.cpp
- Committer:
- coyotebush
- Date:
- 2015-05-06
- Revision:
- 7:939fdc8df95b
- Parent:
- 0:cb422b231ea5
- Child:
- 8:c69fe28366d8
File content as of revision 7:939fdc8df95b:
/* 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) { pulsedur = 0; distance = 0; 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); } */