An illuminating device includes a light source module and a power source module. The controller generates n kinds of waveforms used to eject different amounts of ink from the nozzles ). This assay format enables rapid, one-step assays for a variety of analytes without wash steps that do not sacrifice sensitivity. Further, the method includes verifying the generated classification signature matches the predetermined classification signature. In the present embodiment, a universal interconnect for providing electronic and communicative interconnection of each modular layer is disposed at least once on each modular layer.