jim hamblen
Demo of LED lighting effects using PWM and wait for time delays. Pins are setup for LPC1768 platform’s LEDs. For complete information, see http://developer.mbed.org/users/4180_1/notebook/led-lighting-effects-for-modelers/
Revision 0:5fc0791b9f3c, committed 2014-11-28
- Comitter:
- 4180_1
- Date:
- Fri Nov 28 18:02:35 2014 +0000
- Commit message:
- ver 1.0
Changed in this revision
| main.cpp | Show annotated file Show diff for this revision Revisions of this file |
| mbed.bld | Show annotated file Show diff for this revision Revisions of this file |
diff -r 000000000000 -r 5fc0791b9f3c main.cpp
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Fri Nov 28 18:02:35 2014 +0000
@@ -0,0 +1,30 @@
+#include "mbed.h"
+//LED welding lighting effect
+PwmOut myled(LED1);
+//Use PWM output to enable LED dimming
+
+//Use Cs random number generator rand(), but scaled and
+//converted to a float 0.0 to 1.0 for PWM output
+inline float random_number()
+{
+ return (rand()/(float(RAND_MAX)));
+}
+
+int main()
+{
+ float x = 0.0;
+ while(1) {
+ //get a new random number for PWM
+ x = random_number();
+ //add some exponential brightness scaling
+ //for more of a fast flash effect
+ myled = x*x*x;
+ //fast update rate for welding flashes
+ wait(0.02);
+ //add a random pause between welds
+ if (random_number()>0.9925) {
+ myled=0.0;
+ wait(4.0*random_number());
+ }
+ }
+}
\ No newline at end of file
diff -r 000000000000 -r 5fc0791b9f3c mbed.bld --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Fri Nov 28 18:02:35 2014 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed/builds/031413cf7a89 \ No newline at end of file