File content as of revision 0:ef666343e506:

#include "mbed.h"

PwmOut led1(LED1);
PwmOut led2(LED2);
PwmOut led3(LED3);
PwmOut led4(LED4);


int main() {
    int a = -1;
    float max = 1;
    float medium = 0.2;
    float low = 0.01;
    
    while(1) {
        a += 1;
        if (a == 12) {
           a = 0;
        } 
        
        wait(0.5);
        switch(a){
            case 0:
            led1 = max;
            led2 = 0;
            led3 = 0;
            led4 = 0;
            break;
            case 1:
            led1 = medium;
            led2 = max;
            led3 = 0;
            led4 = 0;
            break;
            case 2:
            led1 = low;
            led2 = medium;
            led3 = max;
            led4 = 0;
            break;
            case 3:
            led1 = 0;
            led2 = low;
            led3 = medium;
            led4 = max;
            break;
            case 4:
            led1 = 0;
            led2 = 0;
            led3 = low;
            led4 = max;
            break;
            case 5:
            led1 = 0;
            led2 = 0;
            led3 = 0;
            led4 = max;
            break;
            case 6:
            led1 = 0;
            led2 = 0;
            led3 = 0;
            led4 = max;
            break;
            case 7:
            led1 = 0;
            led2 = 0;
            led3 = max;
            led4 = medium;
            break;
            case 8:
            led1 = 0;
            led2 = max;
            led3 = medium;
            led4 = low;
            break;
            case 9:
            led1 = max;
            led2 = medium;
            led3 = low;
            led4 = 0;
            break;
            case 10:
            led1 = max;
            led2 = low;
            led3 = 0;
            led4 = 0;
            break;
            case 11:
            led1 = max;
            led2 = 0;
            led3 = 0;
            led4 = 0;
            break;
        }
    }
}