File content as of revision 1:aa9eabdefc12:

                                                     
 #include "mbed.h"
 
 #include "BH1750.h"
 #include "L3GD20H.h"
 //#include <cmath>
 
 // I2C Communication
  BH1750      lum(P0_30,P0_7);    // BH1750 SDA, SCL
  //L3GD20H ori(P0_30,P0_7); //PinName sda, PinName scl
  Serial pc(USBTX, USBRX); // tx, rx
  
  DigitalOut led(LED2);
  int tickerCntr1 = 0;
  Ticker flipLed;
  float dutyCycle=1.0f;

  short ori_rd[3];
  
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)

float fround2(float f){
    float temp = 100*f;
    temp = floor(temp);
    return temp/100;
}

float decideDutyCycle(float f){
    if(f > 3500){
        return 1.0f;
    }
    else if(f > 3000){
        return 0.98f;
    }
    else if(f > 2500){
        return 0.96f;
    }
    else if(f > 2000){
        return 0.93f;
    }
    else if(f > 1500){
        return 0.89f;
    }
    else if(f > 1000){
        return 0.83f;
    }
    else{
        return 0.83*f/1000;
    }
}

void flip(){
//    if(tickerCntr1 %3000 == 0)
//        dutyCycle -= 0.01;
//        
//    if(dutyCycle<= 0)
//        dutyCycle = 1;
    if(lum0 == 0)
        dutyCycle = 1;
    else
        dutyCycle = fround2(decideDutyCycle(lum0));
        
    if(dutyCycle < 0)
        dutyCycle = 0;
    else if(dutyCycle > 1)
        dutyCycle = 1;
            
    if(100*dutyCycle >= tickerCntr1%100){
        led = 1;
    }
    else{
        led = 0;
    }
    tickerCntr1++;
    
    if(tickerCntr1 ==100000001 )
        tickerCntr1 = 0;
     
 }
 
void measureBH1750_0(){
     //BH1750_EN0 = 1;
     //BH1750_EN1 = 1;
     // //wait(0.005);
     
     lum0 = lum.lux();
     
 }
 
 void printthis(){
    if(tickerCntr1 % 6000 == 0){
        lum0 = lum.lux();
        //pc.printf("Illuminance 1: %+7.2f [Lux] DutyCycle: %+7.2f [decima'] \r\n", lum0, dutyCycle);
        
    }
    else if(tickerCntr1 % 6000 == 3000){
       // ori.read(ori_rd);
        
    }
    //else if(tickerCntr1 % 10000 == 0)
        //pc.printf("Illuminance 1: %+7.2f [Lux] DutyCycle: %+7.2f [decimal] XYZ ori: %+7.2f %+7.2f %+7.2f [decimal] \r\n", lum0, dutyCycle, ori_rd[0], ori_rd[1], ori_rd[2]);
}
     
     

 
 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);
  //t1.attach(&printthis, 1.0f);
  //pc.printf("Hi1 \r\n");
  
   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++);
        
        flip();
        printthis();
        wait_us(50.0f);
        

        
   }
   
 }