Revision 0:adc859eb22d0, committed 2013-07-12

Comitter:

virajjayaweera

Date:

Fri Jul 12 13:40:29 2013 +0000

Commit message:

PWM test with the onboard LED

Changed in this revision

diff -r 000000000000 -r adc859eb22d0 main.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Fri Jul 12 13:40:29 2013 +0000
@@ -0,0 +1,24 @@
+//Change the brightness of onboard LED using PWM
+// Tested with FRDM-KL25Z board
+#include "mbed.h"
+
+PwmOut led(LED1);
+
+
+int main()
+{
+   float duty_cycle = 1; //PWM output is inverted for LED. Therefore duty_cycle = 1 means LED off   
+    
+   led.period_ms(1); // PWM freequency = 1/period = 1 kHz
+
+    while(1)
+    {
+        led = duty_cycle;  // also "led.write(duty_cycle)" will do the same thing
+        duty_cycle = duty_cycle - 0.01;
+        wait(0.05); // delay for visually see the effect 
+        
+        if(duty_cycle <= 0)
+            duty_cycle = 1;
+        
+    }
+}
\ No newline at end of file

diff -r 000000000000 -r adc859eb22d0 mbed.bld
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed.bld	Fri Jul 12 13:40:29 2013 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/users/mbed_official/code/mbed/builds/b3110cd2dd17
\ No newline at end of file