Diff: Ping.cpp

Revision:

2:6be59631152a

Parent:

0:1e4b66122368

--- a/Ping.cpp	Sat Mar 12 22:32:06 2011 +0000
+++ b/Ping.cpp	Sat Dec 06 07:40:50 2014 +0000
@@ -2,9 +2,9 @@
 
 #include "mbed.h"
 
-Ping::Ping(PinName PING_PIN)
-        : _event(PING_PIN)
-        , _cmd(PING_PIN)
+Ping::Ping(PinName Trig_PIN, PinName Echo_PIN)
+        : _event(Echo_PIN)
+        , _trig(Trig_PIN),_echo(Echo_PIN)
         , _timer()
         {
             _event.rise(this,&Ping::_Starts);
@@ -30,13 +30,11 @@
 void Ping::Send()
 {
      
-     _cmd.output();
-     _cmd.write(0);  // see the ping documentation http://www.parallax.com/Portals/0/Downloads/docs/prod/acc/28015-PING-v1.6.pdf
+     _trig.write(0);  // see the ping documentation http://www.parallax.com/Portals/0/Downloads/docs/prod/acc/28015-PING-v1.6.pdf
      wait_us(3);
-     _cmd.write(1);
+     _trig.write(1);
      wait_us(3);
-     _cmd.write(0);
-     _cmd.input();
+     _trig.write(0);
      
 }
 void Ping::Set_Speed_of_Sound(int SoS_ms )
@@ -48,7 +46,7 @@
 // -1 means not valid.
 {
     if(_Valid && ~_Busy) 
-        return ((_Time*_SPEED_OF_SOUND_CM)/1000);
+        return ((_Time*_SPEED_OF_SOUND_CM)/1000/2);
     else 
         return -1;
 }
\ No newline at end of file