| 摘要 |
<p>A piezoelectric sensor (2) for detecting an actuation direction comprises: - a plurality of piezoelectric sensor elements (22, I; 22, II; 22, III) each having a terminal (26) and a reference terminal (18); and - a microcontroller (40) electrically connected to the terminals (26) of each of the piezoelectric sensor elements (22, I; 22, II; 22, III) and configured to read signals from each piezoelectric sensor elements (22, I; 22, II; 22, III) between the terminal and the reference terminal (18) indicative of the voltages of each of the piezoelectric sensor elements (22, I; 22, II; 22, III). The microcontroller (40) is configured to i) to detect actuation direction by analysing signals read from neighbouring piezoelectric sensor elements (22, I; 22, II; 22, III) and ii) to store or output the detected direction. In the microcontroller (40) i) at least one but preferably two or three sensitivity ranges for sweeping, sliding, and/or rocking have been defined, and ii) one sensitivity threshold for switching has been defined, in such a manner that the sensitivity threshold for switching requires a higher maximum voltage or time sum for a signal read from each piezoelectric sensor element (22, I; 22, II; 22, III) than the sensitivity range or ranges for sweeping, sliding, and/or rocking. Said range/ranges is/are individual for each of the piezoelectric sensor elements (22, I; 22, II; 22, III).</p> |
