Pulsing

-- Pulsing
-- by Fenthis

sides = { "left", "right", "top"}
speed = 1.0

print("Pulsing the ", table.concat(sides, ", "), " sides.")

local function setSides(val)
    for i = 1, #sides do
        redstone.setOutput(sides[i], val)
    end
end

while true do
    setSides(true)
    sleep(0.1)
    setSides(false)
    sleep(speed - 0.1)
end