Diff: main.cpp

Revision:

5:c024e3b15ca0

Parent:

2:03e5c29343d1

--- a/main.cpp	Tue Feb 19 23:47:40 2013 +0000
+++ b/main.cpp	Mon Jul 29 19:51:02 2013 +0000
@@ -1,21 +1,38 @@
 #include "mbed.h"
+#include "math.h"               // include math.h to get sin function
 
 PwmOut r (LED_RED);
 PwmOut g (LED_GREEN);
 PwmOut b (LED_BLUE);
 
+float lr, lg, lb;               // temp variables for printing current values
+const float pi = 3.1415927;     // create a constant to use for value of pi
+
+Serial PC(USBTX,USBRX);         // define serial port for outputting RGB values
+
 int main() {
+
+    PC.baud(115200);            // set baud rate for serial port
+
     r.period(0.001);
     g.period(0.001);
     b.period(0.001);
 
     while (true) {
-        for (float i = 0.0; i < 1.0 ; i += 0.001) {
-            float p = 3 * i;
-            r = 1.0 - ((p < 1.0) ? 1.0 - p : (p > 2.0) ? p - 2.0 : 0.0);
-            g = 1.0 - ((p < 1.0) ? p : (p > 2.0) ? 0.0 : 2.0 - p);
-            b = 1.0 - ((p < 1.0) ? 0.0 : (p > 2.0) ? 3.0 - p : p - 1.0);
-            wait (0.0025);
+        for (float i = 0.0; i < 60*pi ; i += 0.001) {
+
+            lr = (1+sin(2*i))/2;    // calculate values for RGB based on different
+            lg = (1+sin(3*i))/2;    // frequency sin waves. This should give a nice
+            lb = (1+sin(5*i))/2;    // smooth transistion between colors and a 
+                                    // somewhat non repeating color sequence 
+
+            r = lr;                 // send RGB values to LED PWMs
+            g = lg;
+            b = lb;
+            
+            PC.printf("%f  %f  %f  %f\r\n", i, lr, lg, lb);    // output to console
+
+            wait (0.0025);          // some delay so we can see the changes
         }
     }
 }
\ No newline at end of file