SMS SARFRAZ / Mbed 2 deprecated ultrasonic_proximity_sensor

Child Monitor system

Dependencies:   HC_SR04_Ultrasonic_proximity_sensor mbed

Fork of ultrasonic_sensor_trial by Niranjan Ravi

main.cpp@0:59d1b681f30e, 2017-12-06 (annotated)

Committer:
Niranjan_ravi
Date:
Wed Dec 06 19:37:58 2017 +0000
Revision:
0:59d1b681f30e
ruu

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Niranjan_ravi 0:59d1b681f30e 1 #include "mbed.h"
Niranjan_ravi 0:59d1b681f30e 2 DigitalOut trigger(PTC3);
Niranjan_ravi 0:59d1b681f30e 3 DigitalOut myled(LED1); //monitor trigger
Niranjan_ravi 0:59d1b681f30e 4 DigitalOut myled2(LED2); //monitor echo
Niranjan_ravi 0:59d1b681f30e 5 DigitalIn echo(PTC2);
Niranjan_ravi 0:59d1b681f30e 6 int distance = 0;
Niranjan_ravi 0:59d1b681f30e 7 int correction = 0;
Niranjan_ravi 0:59d1b681f30e 8 Timer sonar;
Niranjan_ravi 0:59d1b681f30e 9 Serial pc(USBTX, USBRX);
Niranjan_ravi 0:59d1b681f30e 10 Serial xbee(PTC17, PTC16);
Niranjan_ravi 0:59d1b681f30e 11 char bufchar;
Niranjan_ravi 0:59d1b681f30e 12
Niranjan_ravi 0:59d1b681f30e 13 int main()
Niranjan_ravi 0:59d1b681f30e 14 {
Niranjan_ravi 0:59d1b681f30e 15 sonar.reset();
Niranjan_ravi 0:59d1b681f30e 16 // measure actual software polling timer delays
Niranjan_ravi 0:59d1b681f30e 17 // delay used later in time correction
Niranjan_ravi 0:59d1b681f30e 18 // start timer
Niranjan_ravi 0:59d1b681f30e 19 sonar.start();
Niranjan_ravi 0:59d1b681f30e 20 xbee.baud(9600);
Niranjan_ravi 0:59d1b681f30e 21 // min software polling delay to read echo pin
Niranjan_ravi 0:59d1b681f30e 22 while (echo==2) {};
Niranjan_ravi 0:59d1b681f30e 23 myled2 = 0;
Niranjan_ravi 0:59d1b681f30e 24 // stop timer
Niranjan_ravi 0:59d1b681f30e 25 sonar.stop();
Niranjan_ravi 0:59d1b681f30e 26 // read timer
Niranjan_ravi 0:59d1b681f30e 27 correction = sonar.read_us();
Niranjan_ravi 0:59d1b681f30e 28 printf("Approximate software overhead timer delay is %d uS\n\r",correction);
Niranjan_ravi 0:59d1b681f30e 29
Niranjan_ravi 0:59d1b681f30e 30 //Loop to read Sonar distance values, scale, and print
Niranjan_ravi 0:59d1b681f30e 31 while(1) {
Niranjan_ravi 0:59d1b681f30e 32 // trigger sonar to send a ping
Niranjan_ravi 0:59d1b681f30e 33
Niranjan_ravi 0:59d1b681f30e 34
Niranjan_ravi 0:59d1b681f30e 35
Niranjan_ravi 0:59d1b681f30e 36 trigger = 1;
Niranjan_ravi 0:59d1b681f30e 37 myled = 1;
Niranjan_ravi 0:59d1b681f30e 38 myled2 = 0;
Niranjan_ravi 0:59d1b681f30e 39 sonar.reset();
Niranjan_ravi 0:59d1b681f30e 40 wait_us(10.0);
Niranjan_ravi 0:59d1b681f30e 41 trigger = 0;
Niranjan_ravi 0:59d1b681f30e 42 myled = 0;
Niranjan_ravi 0:59d1b681f30e 43 //wait for echo high
Niranjan_ravi 0:59d1b681f30e 44 while (echo==0) {};
Niranjan_ravi 0:59d1b681f30e 45 myled2=echo;
Niranjan_ravi 0:59d1b681f30e 46 //echo high, so start timer
Niranjan_ravi 0:59d1b681f30e 47 sonar.start();
Niranjan_ravi 0:59d1b681f30e 48 //wait for echo low
Niranjan_ravi 0:59d1b681f30e 49 while (echo==1) {};
Niranjan_ravi 0:59d1b681f30e 50 //stop timer and read value
Niranjan_ravi 0:59d1b681f30e 51 sonar.stop();
Niranjan_ravi 0:59d1b681f30e 52 //subtract software overhead timer delay and scale to cm
Niranjan_ravi 0:59d1b681f30e 53 distance = (sonar.read_us()-correction)/58.0;
Niranjan_ravi 0:59d1b681f30e 54 myled2 = 0;
Niranjan_ravi 0:59d1b681f30e 55 if(distance<=300)
Niranjan_ravi 0:59d1b681f30e 56 {
Niranjan_ravi 0:59d1b681f30e 57 xbee.printf("%d \n\r", distance);
Niranjan_ravi 0:59d1b681f30e 58 printf(" The baby is at %d cm from the Proximity sensor \n\r", distance);
Niranjan_ravi 0:59d1b681f30e 59 }
Niranjan_ravi 0:59d1b681f30e 60 //wait so that any echo(s) return before sending another ping
Niranjan_ravi 0:59d1b681f30e 61 wait(0.15);
Niranjan_ravi 0:59d1b681f30e 62 }
Niranjan_ravi 0:59d1b681f30e 63 }