T Nara / Mbed 2 deprecated Echo

Ultrasonic sensor used HC-SR04

Dependencies:   mbed

main.cpp@0:6947b0547f9f, 2015-01-18 (annotated)

Committer:
tknara
Date:
Sun Jan 18 13:42:41 2015 +0000
Revision:
0:6947b0547f9f
Ultrasonic sensor

Who changed what in which revision?

UserRevisionLine numberNew contents of line
tknara 0:6947b0547f9f 1 #include "mbed.h"
tknara 0:6947b0547f9f 2
tknara 0:6947b0547f9f 3 Serial pc(USBTX,USBRX);
tknara 0:6947b0547f9f 4 DigitalOut trig(p21);
tknara 0:6947b0547f9f 5 DigitalOut testled(LED1);
tknara 0:6947b0547f9f 6 DigitalIn echo(p22);
tknara 0:6947b0547f9f 7 Timer t;
tknara 0:6947b0547f9f 8 #define sonic_spead 343.595*100;// cm
tknara 0:6947b0547f9f 9
tknara 0:6947b0547f9f 10 int main() {
tknara 0:6947b0547f9f 11 double time;
tknara 0:6947b0547f9f 12 while(1) {
tknara 0:6947b0547f9f 13 testled = 0;
tknara 0:6947b0547f9f 14 t.reset();
tknara 0:6947b0547f9f 15 trig = 1;
tknara 0:6947b0547f9f 16 time = 0;
tknara 0:6947b0547f9f 17 wait_us(10);
tknara 0:6947b0547f9f 18 trig = 0;
tknara 0:6947b0547f9f 19 if (echo == 1) {
tknara 0:6947b0547f9f 20 t.start();
tknara 0:6947b0547f9f 21 while(1){
tknara 0:6947b0547f9f 22 if(echo == 0) {
tknara 0:6947b0547f9f 23 testled = 1;
tknara 0:6947b0547f9f 24 t.stop();
tknara 0:6947b0547f9f 25 time = t.read();
tknara 0:6947b0547f9f 26 time = time / 2.0 *sonic_spead;
tknara 0:6947b0547f9f 27 pc.printf("%lfcm\n\r",time);
tknara 0:6947b0547f9f 28 t.reset();
tknara 0:6947b0547f9f 29 break;
tknara 0:6947b0547f9f 30 }
tknara 0:6947b0547f9f 31 }
tknara 0:6947b0547f9f 32 }
tknara 0:6947b0547f9f 33 }
tknara 0:6947b0547f9f 34 }