This module is a solution verification board for the TS04 four-channel touch module with product number C95874 in the Lichuang Mall . Adjust sensitivity by adjusting C2-C5 and R4-R6. When a touch pad PAD is touched, the LED light corresponding to the PAD is lit and goes out when left. When this module detects that the corresponding PAD is touched, it will output a low level through the corresponding IO port. On the other hand, if PAD is not pressed, the corresponding IO is placed in a floating state [open-drain output]. If you need to output a high level, you need to use a pull-up resistor of about 10K. The schematic diagram is as follows:
Below is the PCB preview
Below is the 3D preview
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