Switch
A manual 0/1 input — the usual way to feed variables into a circuit.
Pins
One output on the right.
How to use it
Click to flip between 0 and 1. Double-click to name it (A, B…) — the truth table and expressions use that name.
Usage example
Switches are inputs, LEDs are outputs: wire a switch to an LED and it's dark when off (0) and lit when on (1). Click a switch to flip it.