Niranjan Ravi
wireles
Dependencies: HC_SR04_Ultrasonic_proximity_sensor mbed
Revision 0:59d1b681f30e, committed 2017-12-06
- Comitter:
- Niranjan_ravi
- Date:
- Wed Dec 06 19:37:58 2017 +0000
- Commit message:
- ruu
Changed in this revision
diff -r 000000000000 -r 59d1b681f30e HC_SR04_Ultrasonic_Library.lib --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/HC_SR04_Ultrasonic_Library.lib Wed Dec 06 19:37:58 2017 +0000 @@ -0,0 +1,1 @@ +https://os.mbed.com/users/Niranjan_ravi/code/HC_SR04_Ultrasonic_proximity_sensor/#c23850f8fb5a
diff -r 000000000000 -r 59d1b681f30e main.cpp
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Wed Dec 06 19:37:58 2017 +0000
@@ -0,0 +1,63 @@
+#include "mbed.h"
+DigitalOut trigger(PTC3);
+DigitalOut myled(LED1); //monitor trigger
+DigitalOut myled2(LED2); //monitor echo
+DigitalIn echo(PTC2);
+int distance = 0;
+int correction = 0;
+Timer sonar;
+Serial pc(USBTX, USBRX);
+Serial xbee(PTC17, PTC16);
+char bufchar;
+
+int main()
+{
+ sonar.reset();
+// measure actual software polling timer delays
+// delay used later in time correction
+// start timer
+ sonar.start();
+ xbee.baud(9600);
+// min software polling delay to read echo pin
+ while (echo==2) {};
+ myled2 = 0;
+// stop timer
+ sonar.stop();
+// read timer
+ correction = sonar.read_us();
+ printf("Approximate software overhead timer delay is %d uS\n\r",correction);
+
+//Loop to read Sonar distance values, scale, and print
+ while(1) {
+// trigger sonar to send a ping
+
+
+
+ trigger = 1;
+ myled = 1;
+ myled2 = 0;
+ sonar.reset();
+ wait_us(10.0);
+ trigger = 0;
+ myled = 0;
+//wait for echo high
+ while (echo==0) {};
+ myled2=echo;
+//echo high, so start timer
+ sonar.start();
+//wait for echo low
+ while (echo==1) {};
+//stop timer and read value
+ sonar.stop();
+//subtract software overhead timer delay and scale to cm
+ distance = (sonar.read_us()-correction)/58.0;
+ myled2 = 0;
+ if(distance<=300)
+ {
+ xbee.printf("%d \n\r", distance);
+ printf(" The baby is at %d cm from the Proximity sensor \n\r", distance);
+ }
+//wait so that any echo(s) return before sending another ping
+ wait(0.15);
+ }
+}
\ No newline at end of file
diff -r 000000000000 -r 59d1b681f30e mbed.bld --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Wed Dec 06 19:37:58 2017 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed/builds/e7ca05fa8600 \ No newline at end of file