The assembly for use in a coffee machine comprises a container having a bowl-shaped inner space bounded by a bottom having at least one outlet opening and at least one vertical sidewall. A drive circuitry layer is positioned in the substrate. A given filter bank is built by first computing a set of shifts i as D1 t1, i1, 2,. A second light transmitting section changes an intensity of the infrared light in accordance with an output signal of the second modulation section to transmit an infrared light signal, which conveys the second data, in parallel with the visible light signal.