Door

chat = peripheral.wrap("bottom")

function move(side)
  for i = 1, 3 do
    rs.setOutput(side, true)
    os.sleep(0.5)
    rs.setOutput(side, false)
    os.sleep(0.5)
  end
end

while true do
  _, user, command = os.pullEvent("command")
  if command[1] == "open" then
    move("top")
  elseif command[1] == "close" then
    move("back")
  end
end