test

    local mon
    local timer = 600
    local function findMonitor()
      for i,v in pairs(rs.getSides()) do
            if peripheral.getType(v) == "monitor" then
              mon = peripheral.wrap(v)
              return
            end
      end
      error("No monitor found!")
    end
    findMonitor()
    for i = timer, 0, -1 do
    mon.write("Waiting", timer, "seconds!")
    end