launch_sequence

local name = "monitor_0"
local modem_pos = "back"
local monitor = peripheral.find("monitor", function(n, monitor)
    return n == name
end)
monitor.clear()

function writeMiddle(message)
    monitor.clear()
    local x, y = monitor.getSize()
    y = math.ceil(y/2)
    x = math.ceil((x - string.len(message))/2)
    monitor.setCursorPos(x, y)
    monitor.write(message)
end

function launchSequence()
    rednet.open(modem_pos)
    writeMiddle("Starting...")
    sleep(30)
    for i=10,1,-1 do
        writeMiddle(tostring(i))
        if i == 5 then
            local id = rednet.lookup("door_control", "rocket")
            rednet.send(id, "open", "door_control")
        end
        sleep(1)
    end

    writeMiddle("GO GO GO!")
    rednet.close(modem_pos)
    while true do
        print("Mission complete? (y/n)")
        if read() == "y" then
            break
        end
    end

    rednet.open(modem_pos)
    writeMiddle("Hangar closed!")
    local id = rednet.lookup("door_control", "rocket")
    rednet.send(id, "close", "door_control")
    rednet.close(modem_pos)
end

print("Initiating launch sequence")
launchSequence()