pistonDoor

arg = {...}
assert(#arg == 2,'usage: pistonDoor <2 pistons signal> <4 pistons signal>')

--Send a signal to open the hidden door
function open()
    rs.setOutput(arg[1],false)
    os.sleep(0.3)
    rs.setOutput(arg[2],false)
end
--Send a signal to close it
function close()
    rs.setOutput(arg[2],true)
    os.sleep(0.3)
    rs.setOutput(arg[1],true)
end

--Waits for a change in redstone signal, once detected it will send signal to open, wait 4 seconds then close. Defaults to staying closed.

close()
while true do
    event = os.pullEvent('redstone')
    open()
    os.sleep(4)
    close()
end