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.

Diff: main.cpp

Revision:
4:052ac3f5c938
Parent:
3:3297ea6e3ae1
Child:
5:889566fb3a85
Child:
6:bca0839e8295
--- a/main.cpp	Mon Dec 07 09:38:35 2015 +0000
+++ b/main.cpp	Mon Dec 07 10:44:07 2015 +0000
@@ -1,15 +1,32 @@
 #include "mbed.h"
 #include "HCSR04.h"
+#include "AutomationElements.h"
 
 Serial pc(USBTX, USBRX);
+HCSR04 sensor(p5, p7);
+float sampleTime = 0.1;
+PT1 filter(1, 2, sampleTime);
+Ticker ticker;
+float distance;
+float filteredDistance; 
+DigitalOut led1(LED1);
+
+void calc() {
+    led1 = 1;
+    distance = sensor.getDistance_mm();
+    filter.in(distance);
+    filteredDistance = filter.out();
+    pc.printf("%7.1f mm  %7.1f mm  \r", distance, filteredDistance);
+    led1 = 0;
+}
 
 int main() {
-    HCSR04 sensor(p5, p7);
     sensor.setRanges(10, 110);
-    pc.printf("Min. range = %g cm\n\rMax. range = %g cm\n\r",
-     sensor.getMinRange(), sensor.getMaxRange());
+    pc.printf("Minimum sensor range = %g cm\n\rMaximum sensor range = %g cm\n\r", sensor.getMinRange(), sensor.getMaxRange());
+    pc.printf("Sensor:       Filtered:\n\r");
+    ticker.attach(&calc, sampleTime);
+    
     while(1) {
-        pc.printf("Distance: %5.1f mm\r", sensor.getDistance_mm());
         wait_ms(500);
     }
 }
\ No newline at end of file