Reference
The article discusses capacitive touch sensors, explaining how human touch forms a coupling capacitor with the sensor's surface, allowing detection through insulating materials over 20mm thick. It highlights the need for users to solder the copper foil sensor plate to the sensor board.
Principle
This is a capacitive sensing-based touch sensor. When the human body directly touches the metal surface on the sensor, the electric field of the human body forms a coupling capacitor between the human finger and the working surface, and the coupling capacitance can be sensed. It can detect the touch of a finger through insulating masterial (glass, plastic, etc.) shell with thickness above 20mm.
Other Supplementary Information
When a finger touches the metal surface on the touch sensor, the touch sensor outputs a high level, otherwise, it outputs low level.
Note: This touch sensor requires users to connect and solder the copper foil sensor plate and the sensor board according to their own needs.
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