A Capacitive Touch Sensing Technique with Series-connected Sensing Electrodes
summary
Electrodes are wired in series-connected electrodes through small capacitors so a single sensing circuit attaches with a two-wire interface that measures two capacitances while switching signal polarity; simulations and hardware match and after per-user calibration the system reliably distinguishes up to ten electrodes recognized and supports two-finger multi-touch. Prototypes include thin PCB, wire, flexible and paper “capacitor-free” electrodes; limits: needs calibration, accuracy degrades past ~10 pads and three-finger touch fails.
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chapters (9)
- 0:00Introduction to touch sensing
- 1:27Challenges in prototyping touch sensors
- 4:50Proposed series-connected sensing technique
- 9:01Electrode prototypes and designs
- 11:46Simulation and measurement results
- 13:38User tests and calibration impact
- 15:32Application demos and examples
- 16:43Limitations and future work
- 17:29Q&A on calibration methods
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