door2

local modem = peripheral.wrap("top")
modem.open(3)  -- Open channel 3 so that we can listen on it
while true do
event, side, senderChannel, replyChannel, msg, distance = os.pullEvent("modem_message")

if (message == "Open") then
print(msg)

redstone.setOutput("back", true)

os.sleep(.5)

redstone.setOutput("back", false)

end

end