Initializing a capacitive sensing switch for a wireless device
US9130571B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 11, 2007 |
| Grant date | Sep 8, 2015 |
| Priority date | — |
| Expiry date | Jan 12, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K2217/94089
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An apparatus, system, and method that initialize a capacitive sensing switch and detects a pushed button are described. The apparatus comprises a keypad, a logic component, an initialization threshold, a measured capacitive value, and a processor. The keypad comprises at least one capacitive sensing switch. The logic component is configured to determine a capacitive sensing range for each capacitive sensing switch, wherein the range corresponds to the difference between the maximum and minimum capacitance. Each capacitive sensing switch is initialized when the capacitive sensing range exceeds the initialization threshold. The measured capacitive value measures the capacitive value for each switch and a corresponding push-button threshold determines whether the button has been pushed. The processor is configured to process computer instructions that correspond to each switch when the capacitive sensing range exceeds the initialization threshold and when the measured capacitive value for each capacitive sensing switch exceeds the push-button threshold.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.