This module is a capacitive touch switch module based on touch detection IC (TTP223B).
Under normal conditions, the module outputs low level and the mode is low power consumption mode; when the corresponding position is touched with a finger, the module will output high level and the mode is switched to fast mode; when there is no touch for 12 seconds, the mode is switched to low again Power consumption mode.
The module can be installed on the surface of non-metallic materials such as plastic and glass, and a thin piece of paper (non-metal) can be covered on the surface of the module. As long as the touch position is correct, it can be made into a hidden wall, desktop, etc. button.
This module allows you to avoid the trouble of regular pressing buttons.

Features:

• Inching type: the initial state is low level, touch is high level, non-touch is low level (similar to the function of tapping the button)
  
• Low power consumption: power supply can be 2~5.5V DC
  
• Both front and back sides can be used as touch surfaces, which can replace traditional touch buttons
  
• 4 M2 screw positioning holes for easy installation
  
• Control interface: a total of 3 pins (GND, VCC, SIG), GND is the ground, VCC is the power supply, and SIG is the digital signal output pin;
  
• Power indicator: green LED, it lights up when power on correctly;
  
• Touch area: the inner area of the icon similar to a fingerprint, which can be triggered by a light touch of a finger.
  
• Positioning holes: 4 M2 screw positioning holes with a diameter of 2.2mm, which makes the module easy to install and position and realize the combination between modules