door.lua

rednet.open("top")
message=""
redstone.setOutput("front",true)

while true do
    id,message=rednet.receive()
    if message == "vroom" and id==12 then
        redstone.setOutput("front",false)
        sleep(2)
        redstone.setOutput("front",true)
    else
        print("NO SIGNAL")
    end
end