2019NHK_teamA / HCSR04

Ultrasound Ranging Sensor module

Dependents:   HC-SR04

Files at this revision

API Documentation at this revision

Revision 8:095071ae3cac, committed 2019-04-27

Comitter:
shina
Date:
Sat Apr 27 13:38:55 2019 +0000
Parent:
7:71da0dbf4400
Commit message:
This is a prototype program about HC-SR04.

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 
--- a/hcsr04.cpp	Sat Mar 30 18:55:03 2013 +0000
+++ b/hcsr04.cpp	Sat Apr 27 13:38:55 2019 +0000
@@ -29,6 +29,7 @@
     echo.rise(this,&HCSR04::isr_rise);
     echo.fall(this,&HCSR04::isr_fall);
     trigger=0;
+    this->temperature=25;
 }
 
 HCSR04::~HCSR04()
@@ -45,12 +46,16 @@
     wait_us(10);
     trigger=0;
 }
+void HCSR04::set_temperature(int temperature)
+{
+    this->temperature=temperature;
+}
 
 void HCSR04::isr_fall(void)
 {
     pulsetime.stop();
     pulsedur = pulsetime.read_us();
-    distance= (pulsedur*343)/20000;
+    distance=(pulsedur*(331.5+temperature*0.6)/20000);
     pulsetime.reset();
 }
 

--- a/hcsr04.h	Sat Mar 30 18:55:03 2013 +0000
+++ b/hcsr04.h	Sat Apr 27 13:38:55 2019 +0000
@@ -53,6 +53,9 @@
     void isr_fall(void);
     void fall (void (*fptr)(void));
     void rise (void (*fptr)(void));
+    
+    int temperature;
+    void set_temperature(int temperature);