Dhiraj Matlani
This specific code runs for ultrasonic sensor and gives high alert if there is motion beyond 20cm. Additionally if we use RFID tag ultrasonic sensor stops functioning and gives authorized access to make motion.
Diff: hcsr04.cpp
- Revision:
- 0:c7eacabfa681
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/hcsr04.cpp Mon Dec 16 17:44:49 2019 +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);
+
+ }
+*/
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