Dear you didn't read the post carefully. I don't have any problem in understanding I2C or communicating with multiple sensors. I'm merely posting a library, for other people to use, that I modified to be able to communicate on multiple simultaneous I2C buses. Of course it is possible as the controller handles each bus sequentially. Using this library, you don't need to enable/disable any sensor (it's a neat idea though but not so neat when the sensor needs some settling time and configuration after each boot up - a lot of wastage in time critical applications.) And most of the sensors don't have user configurable I2C address so in that case, you're bound to use them on different I2C buses.