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Actually, there are only really two electrical connections, as inside the switch package pins
B and C are connected together, as are A and D.
Principle
BUTTON SWITCH and number 13 port have the built-in LED simple circuit. To produce a
switch flasher, we can use connect the digital port 13 to the built-in LED and connect the
BUTTON SWITCHS port to number3 port of Elego Uno board. When the switch sensing, LED
twinkle light to the switch signal.
Connection
Schematic