Revision 2:fe61a5e4cdf5, committed 2016-06-14

Comitter:

wadh4587

Date:

Tue Jun 14 14:34:22 2016 +0000

Parent:

1:b3590ab2a8ae

Commit message:

When someone comes within 50cm, buzzer sounds once, LED flashes for 5s, then alarm sounds until interrupted.

Changed in this revision

diff -r b3590ab2a8ae -r fe61a5e4cdf5 main.cpp
--- a/main.cpp	Tue Jun 14 11:12:17 2016 +0000
+++ b/main.cpp	Tue Jun 14 14:34:22 2016 +0000
@@ -1,34 +1,73 @@
 /* Arthur Spencer 14/06/16
 LV-MaxSonar-EZ1 Range Finder
-Indicator LED at D0 (always on), Range indicators that come on at 70cm and 50cm
-
+When someone comes within 50cm, LED flashes for 5s, then buzzer sounds until interupted.
 */
 #include "mbed.h"
 
 AnalogIn ain(A0);           //Receives analogue signal from range finder
-//Serial pc(USBTX, USBRX);
+Serial pc(USBTX, USBRX);
+
+PwmOut buzz(D2);
+DigitalOut timer(D1);
+int stop;
 
-DigitalOut far(D0);
-DigitalOut mid(D1);
-DigitalOut near(D2);
+void press_x()      //Interrupt sequence
+{
+    char c = pc.getc();
+    if(c == 'x') {
+        stop = 1;
+        pc.printf("Interrupt\n\r");
+    }
+}
 
 int main()
 {
-    float  volts, distance;
-
+    float  volts, distance, p, q;
+    buzz.period_ms(2);
+    timer = 0;
+    buzz = 0;
+    stop = 0;
+    pc.attach(&press_x);
     while (1) {
-        volts = ain.read();
-        distance = volts*600;        //cm
-//        pc.printf("V =  %f Distance = %f\n\n", volts, distance);          //Prints voltage and distance
-//        wait(0.5);
-        if (distance<30) {
-            near = 1, mid = 1, far = 1;
+        if (stop == 0) {
+            volts = ain.read();
+            distance = volts*1000;        //cm
+            wait(0.5);
+            if (distance > 50) {
+                timer = 0;
+                buzz = 0;
+                wait(0.2);
+            } else {
+                for( p = 0.0f; p < 0.4; p += 0.1) {       //Initial buzz
+                    if(p<0.2) {
+                        buzz = 0.5;
+                        wait(0.1);
+                    } else {
+                        buzz = 0;
+                        wait(0.1);
+                    }
+                }
+                for( p = 0; p < 10; p++) {              //5s LED timer
+                    timer = !timer;
+                    wait(0.5);
+                }
+                for( q = 0; q < 60; q += 1) {       //Alarm
+                    if (stop == 0) {
+                        for( p = 0.0f; p < 0.5; p += 0.1) {
+                            if(p<0.25) {
+                                buzz = 0.5;
+                                wait(0.05);
+                            } else {
+                                buzz = 0;
+                                wait(0.05);
+                            }
+                        }
+                    } else {
+                        buzz = 0, timer = 0;
+                    }
+                }
+            }
         } else {
-            if (distance<50) {
-            near = 0, mid = 1, far = 1;
-        } else {
-            near = 0, mid = 0, far = 1;
         }
     }
-}
 }
\ No newline at end of file