T Nara
/
Echo
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Revision 0:6947b0547f9f, committed 2015-01-18
- Comitter:
- tknara
- Date:
- Sun Jan 18 13:42:41 2015 +0000
- Commit message:
- Ultrasonic sensor
Changed in this revision
| main.cpp | Show annotated file Show diff for this revision Revisions of this file |
| mbed.bld | Show annotated file Show diff for this revision Revisions of this file |
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Sun Jan 18 13:42:41 2015 +0000
@@ -0,0 +1,34 @@
+#include "mbed.h"
+
+Serial pc(USBTX,USBRX);
+DigitalOut trig(p21);
+DigitalOut testled(LED1);
+DigitalIn echo(p22);
+Timer t;
+#define sonic_spead 343.595*100;// cm
+
+int main() {
+ double time;
+ while(1) {
+ testled = 0;
+ t.reset();
+ trig = 1;
+ time = 0;
+ wait_us(10);
+ trig = 0;
+ if (echo == 1) {
+ t.start();
+ while(1){
+ if(echo == 0) {
+ testled = 1;
+ t.stop();
+ time = t.read();
+ time = time / 2.0 *sonic_spead;
+ pc.printf("%lfcm\n\r",time);
+ t.reset();
+ break;
+ }
+ }
+ }
+ }
+}
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Sun Jan 18 13:42:41 2015 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed/builds/4fc01daae5a5 \ No newline at end of file