SquareWave

SquareWave[x] gives a square wave that alternates between +1 and -1 with unit period.

SquareWave[{y1, y2}, x] gives a square wave that alternates between y1 and y2 with unit period.

Examples

Plot a square wave:

Plot[SquareWave[x], {x, 0, 3}]

Square wave alternating between 0 and 5:

Plot[SquareWave[{0, 5}, x], {x, 0, 3}]

Please visit the official Wolfram Language Reference for more details.