jim hamblen / Mbed 2 deprecated LED_Railroad_Crossing

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/

Dependencies:   mbed

main.cpp@0:a903b3cf5317, 2014-11-28 (annotated)

Committer:
4180_1
Date:
Fri Nov 28 17:59:16 2014 +0000
Revision:
0:a903b3cf5317
ver 1.0

Who changed what in which revision?

UserRevisionLine numberNew contents of line
4180_1 0:a903b3cf5317 1 #include "mbed.h"
4180_1 0:a903b3cf5317 2 //LED Railroad Crossing Lighting Effect
4180_1 0:a903b3cf5317 3 PwmOut myled(LED1);
4180_1 0:a903b3cf5317 4 PwmOut myled2(LED4);
4180_1 0:a903b3cf5317 5 //Use a PWM output to enable dimming
4180_1 0:a903b3cf5317 6 //1.0 is full on, 0.0 off, 0.5 50% on
4180_1 0:a903b3cf5317 7
4180_1 0:a903b3cf5317 8 //function to simulate incandescent bulb warm up
4180_1 0:a903b3cf5317 9 //and cool down cycles
4180_1 0:a903b3cf5317 10 void incandescent_bulb(PwmOut led, float on_time = 0.1,
4180_1 0:a903b3cf5317 11 float warm_time = 0.2)
4180_1 0:a903b3cf5317 12 {
4180_1 0:a903b3cf5317 13 //LED warm up effect using PWM
4180_1 0:a903b3cf5317 14 for(int i=0; i<10; i++) {
4180_1 0:a903b3cf5317 15 led = i/10.0;
4180_1 0:a903b3cf5317 16 wait(warm_time/10.0);
4180_1 0:a903b3cf5317 17 }
4180_1 0:a903b3cf5317 18 //LED at full brightness level
4180_1 0:a903b3cf5317 19 led = 1.0;
4180_1 0:a903b3cf5317 20 wait(on_time);
4180_1 0:a903b3cf5317 21 //LED cool down effect using PWM
4180_1 0:a903b3cf5317 22 for(int i=9; i>0; i--) {
4180_1 0:a903b3cf5317 23 led = i/10.0;
4180_1 0:a903b3cf5317 24 wait(warm_time/10.0);
4180_1 0:a903b3cf5317 25 }
4180_1 0:a903b3cf5317 26 //LED off
4180_1 0:a903b3cf5317 27 led = 0.0;
4180_1 0:a903b3cf5317 28 }
4180_1 0:a903b3cf5317 29
4180_1 0:a903b3cf5317 30 int main()
4180_1 0:a903b3cf5317 31 {
4180_1 0:a903b3cf5317 32 while(1) {
4180_1 0:a903b3cf5317 33 incandescent_bulb(myled);
4180_1 0:a903b3cf5317 34 incandescent_bulb(myled2);
4180_1 0:a903b3cf5317 35 }
4180_1 0:a903b3cf5317 36 }