File content as of revision 0:3cef86fc978f:

                                                     
 #include "mbed.h"
 #include "BH1750.h"
 
 // I2C Communication
  BH1750      lum(P0_30,P0_7);    // BH1750 SDA, SCL
  Serial pc(USBTX, USBRX); // tx, rx
  
  DigitalOut led(LED2);
  int tickerCntr1 = 0;
  Ticker flipLed;
  float dutyCycle=1.0f;

  
DigitalOut BH1750_EN0(P0_13);
float lum0 = 0;
//DigitalOut BH1750_EN1(P0_14);
//float lum1 = 0;

  
// // If you connected I2C line not only this device but also other devices,
// //     you need to declare following method.
//  I2C         i2c(P0_7,P0_30);    // SDA, SCL
//  BH1750      lum(i2c);         // BH1750 SDA, SCL (Data available every 120mSec)

void flip(){
//    if(tickerCntr1 %3000 == 0)
//        dutyCycle -= 0.01;
//        
//    if(dutyCycle<= 0)
//        dutyCycle = 1;
    if(dutyCycle<= 0)
        dutyCycle = 0;
    else if(dutyCycle >= 1)
        dutyCycle = 1;
            
    if(100*dutyCycle >= tickerCntr1%100){
        led = 1;
    }
    else{
        led = 0;
    }
    tickerCntr1++;
    
    if(tickerCntr1 ==100001 )
        tickerCntr1 = 0;
     
 }
 
void measureBH1750_0(){
     BH1750_EN0 = 0;
     BH1750_EN1 = 1;
     //wait(0.005);
     return lum.lux();
 }
 
 float measureBH1750_1(){
     BH1750_EN0 = 1;
     BH1750_EN1 = 0;
    // wait(0.005);
     return lum.lux();
 } 
 
 
 int main() {;
   int reading_num = 0;


  flipLed.attach_us(&flip, 50.0f);
   while(true){
//      lum1 = measureBH1750_1();
//      lum0 = measureBH1750_0();
//      pc.printf("Illuminance 1: %+7.2f [Lux] : Illuminance 2: %+7.2f [Lux] : %i\r\n", lum0, lum1, reading_num++);

      wait(0.5);
   }
   
 }