   I2CwriteByte(MAG_ADDRESS,0x0A,0x16);
   
    pinMode(13, OUTPUT);
-  Timer1.initialize(100000);         // initialize timer1, and set a 1/2 second period
+  Timer1.initialize(1000000);         // initialize timer1, and set a 1/2 second period
   Timer1.attachInterrupt(callback);  // attaches callback() as a timer overflow interrupt
   
   

  
  // Display time
  Serial.print (millis()-ti,DEC);
  Serial.print ("\t");

  
  // _______________
  // ::: Counter :::

//  Serial.print ("\t");
  
  // End of line
  //Serial.println("");
  //delay(500);  
 
  // ____________________________________
  // :::  accelerometer and gyroscope ::: 
