A system that supports automatic blogging as well as social group interactions comprises a mobile device with a client application that is communicatively coupled over Internet to an interaction management server capable of facilitating message distribution to social groups as well as blogging of messages selectively. The processor reads commands, which contain a set of predetermined parameters of the camera module, via the second interface and transmits the set of predetermined parameters to the camera module via the first interface. For an optimization of the signal transmission with a simultaneous reduction of the stray radiation or the interference sensitivity, respectively, the transmitter comprises means for controlling the amplitude of the transmitted signal. The intensity of the reflected light varies sinusoidally with the change in layer thickness as the layer is removed.