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This is a capacitive touch sensor module with 4 channels. It's perfect for adding capacitive touch inputs to any project. It can accurately detect up to 4 points. This keypad can also be used in place of a mechanical keypad. To check the status of each pressed key, four status LED SMD types are provided. The TTP 224 IC offers a capacitive sense input feed designed for touchpad control, pursued by a 4-finger-sized touchpad, and is a 4-Switch digital touch sensor with capacitive sense technology. The board's output side has six pin headers, four of which can be connected to the digital I/O of any microcontroller board (Arduino, ARM STM32).
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