| 摘要 |
Disclosed is a reader, 1, for capacitively-reading a coded electrically-conductive pattern (4; Fig. 5). The reader comprises a set of electrodes, 7, (including a sense electrode, 13, and a plurality of excitation electrodes, 14), an amplifier, 8, a Schmitt trigger, 9, and a microcontroller, 10. The microcontroller comprises a plurality of input/output ports, 11, wherein each excitation electrode is coupled to one of the respective input/output ports. The microcontroller is configured to apply a signal waveform, 16, of a given shape and a given frequency to each excitation electrode at different phase offsets and to process the detected signal from the sense electrode. A second inventive concept is for an article comprising a substrate with an electrically conductive pattern. The pattern comprises a central pad and at least one peripheral pad extending from the central pad. The number position and size of the pads may be used to encode data. |
