Viraj Jayaweera / Mbed 2 deprecated PWMTestwithLED

Change LED brightness brightness from 0 to 100%

Dependencies:   mbed

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Show/hide line numbers main.cpp Source File

main.cpp

00001 //Change the brightness of onboard LED using PWM
00002 // Tested with FRDM-KL25Z board
00003 #include "mbed.h"
00004 
00005 PwmOut led(LED1);
00006 
00007 
00008 int main()
00009 {
00010    float duty_cycle = 1; //PWM output is inverted for LED. Therefore duty_cycle = 1 means LED off   
00011     
00012    led.period_ms(1); // PWM freequency = 1/period = 1 kHz
00013 
00014     while(1)
00015     {
00016         led = duty_cycle;  // also "led.write(duty_cycle)" will do the same thing
00017         duty_cycle = duty_cycle - 0.01;
00018         wait(0.05); // delay for visually see the effect 
00019         
00020         if(duty_cycle <= 0)
00021             duty_cycle = 1;
00022         
00023     }
00024 }
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