Air Gap between Capsense Sensor and an Overlay | Cypress Semiconductor
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Air Gap between Capsense Sensor and an Overlay
Can there be an air gap between a Capsense sensor and an Overlay?
Capsense is not recommended to have any air gap between Capactitve Sensor PCB and an Overlay material.
If the requirement demands an air gap, you may connect a spring between the capsense button and the overlay, this should enable to detect it as a button with better sensitivity.
You may also refer an application note "
Using Springs as CapSense Sensors AN44999"
This application note considers the possibility of using springs as sensors. A comparison with solid conductive sensors and recommendations for the practical usage of springs are also discussed.