You should disclose anything (hardware, software, or process) you create from scratch or from existing parts, while you are on the job. If you are unsure, send us an email at NOAA.T2@noaa.gov and we will give you an opinion.
Other than your time to prepare a disclosure form and get it signed by your manager, there is no cost for your or the Lab/Center and this process will not limit your ability to use your technology.