Grove LED buttons are available in 3 different main colors: yellow, blue, and red .
There is a 4-pin socket on the LED button module. 2 of these pins are used to supply power. It can operate with 5V or 3.3V. Of the other two pins, one is used for the input signal and the other for the output signal.
The LED on the button can be controlled via the input pin (SIG1). LED control is performed with an N-Channel MOSFET. Although the LED is initially off, it becomes active when a HIGH value is sent from the signal pin.
The output pin (SIG2) is designed as normally closed. Therefore, while a HIGH value is read from the pin when the button is not pressed, a LOW value is read when the button is pressed.

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