Portcullis

local RUNNING = true
local OPENING = false
local CLOSING = false
local STATE = "closed"

function open(autoClose)
    if OPENING or CLOSING then
        return
    end

    print("OPENING")

        CLOSING = false
        OPENING = true

        rs.setOutput("top", true)
        os.sleep(0.2)
        rs.setOutput("top", false)
        os.sleep(0.7)
    print(".")

        rs.setOutput("top", true)
        os.sleep(0.2)
        rs.setOutput("top", false)
        os.sleep(0.7)
    print(". .")

        rs.setOutput("top", true)
        os.sleep(0.2)
        rs.setOutput("top", false)
        os.sleep(0.7)
    print(". . .")

        rs.setOutput("top", true)
        os.sleep(0.2)
        rs.setOutput("top", false)
        os.sleep(0.7)
    print(". . . .")


        OPENING = false
        STATE = "opened"

    if autoClose then
        sleep(3)
        close()
    end
end

function close()
    if OPENING or CLOSING then
        return
    end

    OPENING = false
        CLOSING = true

    print("CLOSING")

        rs.setOutput("bottom", true)
        os.sleep(0.2)
        rs.setOutput("bottom", false)
        os.sleep(0.7)
    print(".")

        rs.setOutput("bottom", true)
        os.sleep(0.2)
        rs.setOutput("bottom", false)
        os.sleep(0.7)
    print(". .")

        rs.setOutput("bottom", true)
        os.sleep(0.2)
        rs.setOutput("bottom", false)
        os.sleep(0.7)
    print(". . .")

        rs.setOutput("bottom", true)
        os.sleep(0.2)
        rs.setOutput("bottom", false)
        os.sleep(0.7)
    print(". . . .")

        CLOSING = false
        STATE = "closed"
end

term.clear()

while RUNNING do
  local type = os.pullEvent("redstone")

  if not OPENING and not CLOSING then
    if rs.getInput("back") or rs.getInput("front") then
      if STATE == "closed" then
    open(true)
      else
    close()
      end
    end
  end
end