TVZ Mechatronics Team / Mbed 2 deprecated HC-SR04

A program that demonstrates the development of library, using as an example an ultrasonic distance sensor HC-SR04.

Dependencies:   mbed HCSR04 AutomationElements

The purpose of this program is to encourage students to develope their own classes. Instructions how to follow the development of this program and class HCSR04 for ultrasonic distance measurement are given here.

main.cpp@4:052ac3f5c938, 2015-12-07 (annotated)

Committer:
tbjazic
Date:
Mon Dec 07 10:44:07 2015 +0000
Revision:
4:052ac3f5c938
Parent:
3:3297ea6e3ae1
Child:
5:889566fb3a85
Child:
6:bca0839e8295
PT1 filter added

Who changed what in which revision?

UserRevisionLine numberNew contents of line
tbjazic 0:ebee649c5b1b 1 #include "mbed.h"
tbjazic 2:f86b1e3609b3 2 #include "HCSR04.h"
tbjazic 4:052ac3f5c938 3 #include "AutomationElements.h"
tbjazic 0:ebee649c5b1b 4
tbjazic 3:3297ea6e3ae1 5 Serial pc(USBTX, USBRX);
tbjazic 4:052ac3f5c938 6 HCSR04 sensor(p5, p7);
tbjazic 4:052ac3f5c938 7 float sampleTime = 0.1;
tbjazic 4:052ac3f5c938 8 PT1 filter(1, 2, sampleTime);
tbjazic 4:052ac3f5c938 9 Ticker ticker;
tbjazic 4:052ac3f5c938 10 float distance;
tbjazic 4:052ac3f5c938 11 float filteredDistance;
tbjazic 4:052ac3f5c938 12 DigitalOut led1(LED1);
tbjazic 4:052ac3f5c938 13
tbjazic 4:052ac3f5c938 14 void calc() {
tbjazic 4:052ac3f5c938 15 led1 = 1;
tbjazic 4:052ac3f5c938 16 distance = sensor.getDistance_mm();
tbjazic 4:052ac3f5c938 17 filter.in(distance);
tbjazic 4:052ac3f5c938 18 filteredDistance = filter.out();
tbjazic 4:052ac3f5c938 19 pc.printf("%7.1f mm %7.1f mm \r", distance, filteredDistance);
tbjazic 4:052ac3f5c938 20 led1 = 0;
tbjazic 4:052ac3f5c938 21 }
tbjazic 0:ebee649c5b1b 22
tbjazic 0:ebee649c5b1b 23 int main() {
tbjazic 3:3297ea6e3ae1 24 sensor.setRanges(10, 110);
tbjazic 4:052ac3f5c938 25 pc.printf("Minimum sensor range = %g cm\n\rMaximum sensor range = %g cm\n\r", sensor.getMinRange(), sensor.getMaxRange());
tbjazic 4:052ac3f5c938 26 pc.printf("Sensor: Filtered:\n\r");
tbjazic 4:052ac3f5c938 27 ticker.attach(&calc, sampleTime);
tbjazic 4:052ac3f5c938 28
tbjazic 0:ebee649c5b1b 29 while(1) {
tbjazic 3:3297ea6e3ae1 30 wait_ms(500);
tbjazic 0:ebee649c5b1b 31 }
tbjazic 0:ebee649c5b1b 32 }