LED Module is a part of Blockduino Kit. It was design to simplify the wiring connection between microntroller and the module. It have three wire connection which is Signal (S), Vcc (V) and Ground (G). The signal pin should be connected to Arduino I/O, Vcc to +5v / +3.3v (ESP) and Ground. This LED Module built in resistor 10K to make it as Active High switching triggering. When button pushed the signal will send High (+5v) to Arduino pin.
Mycest Button Module
Mycest Solution 
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