Data Sheet

7.2 Community Resources 7 SUPPORTED RESOURCES
Appendix A - Touch Sensor
A touch sensor system is built on a substrate which carries electrodes and relevant connections with a flat protective
surface. When a user touches the surface, the capacitance variation is triggered, and a binary signal is generated
to indicate whether the touch is valid.
Protective cover
Substrate
Electrode
C
ESP32
Figure 5: A Typical Touch Sensor Application
In order to prevent capacitive coupling and other electrical interference to the sensitivity of the touch sensor system,
the following factors should be taken into account.
A.1. Electrode Pattern
The proper size and shape of an electrode helps improve system sensitivity. Round, oval, or shapes similar to a
human fingertip is commonly applied. Large size or irregular shape might lead to incorrect responses from nearby
electrodes.
Figure 6: Electrode Pattern Requirements
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