Due to my research my I figured out that there is a number of supported toolboxes for Simulink for a variety of controllers from NXP. In that list Model-Based Design Toolbox | NXP there is no such package for the used LPC1768.
My question is there any possibility that one of the toolboxes in the above link will work?
There is not even one for the ARM M3 architecture.
Otherwise I guess I need to implement the handling of my Sensor values and outputs by myself.
As you mention the Model-Based Design Toolboxdoes not support the LPC1768. Unfortunately we dont have information on the Simulink Matlab toolbox, I recommend to speak with their support team regarding the toolboxes that they support.