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@6:bca0839e8295, 2016-12-10 (annotated)

Committer:
tbjazic
Date:
Sat Dec 10 08:28:06 2016 +0000
Revision:
6:bca0839e8295
Parent:
4:052ac3f5c938 
Filtering with Ticker object corrected.

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 6:bca0839e8295 7 float sampleTime = 0.5;
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
tbjazic 4:052ac3f5c938 13 void calc() {
tbjazic 6:bca0839e8295 14 sensor.startMeasurement();
tbjazic 4:052ac3f5c938 15 }
tbjazic 0:ebee649c5b1b 16
tbjazic 0:ebee649c5b1b 17 int main() {
tbjazic 6:bca0839e8295 18 sensor.setRanges(2, 400);
tbjazic 4:052ac3f5c938 19 pc.printf("Minimum sensor range = %g cm\n\rMaximum sensor range = %g cm\n\r", sensor.getMinRange(), sensor.getMaxRange());
tbjazic 4:052ac3f5c938 20 pc.printf("Sensor: Filtered:\n\r");
tbjazic 4:052ac3f5c938 21 ticker.attach(&calc, sampleTime);
tbjazic 6:bca0839e8295 22 while(true) {
tbjazic 6:bca0839e8295 23 while(!sensor.isNewDataReady()) {
tbjazic 6:bca0839e8295 24 // wait for new data
tbjazic 6:bca0839e8295 25 }
tbjazic 6:bca0839e8295 26 distance = sensor.getDistance_cm();
tbjazic 6:bca0839e8295 27 filter.in(distance);
tbjazic 6:bca0839e8295 28 filteredDistance = filter.out();
tbjazic 6:bca0839e8295 29 pc.printf("%7.1f cm %7.1f cm\n\r", distance, filteredDistance);
tbjazic 0:ebee649c5b1b 30 }
tbjazic 0:ebee649c5b1b 31 }