Sharing data that you create through a project funded by a federal agency, foundation, or other research sponsor is an important component of your data management plan. As stated within the NSF Data Sharing Policy:
"Investigators are expected to share with other researchers, at no more than incremental cost and within a reasonable time, the primary data, samples, physical collections and other supporting materials created or gathered in the course of work under NSF grants. Grantees are expected to encourage and facilitate such sharing." (http://www.nsf.gov/bfa/dias/policy/dmp.jsp, as on Aug. 1, 2019)
You can share your data in a number of ways, including simple ones such as posting it online through a project or university website. Be aware, however, that this may not be a long-term archival solution - for example, of the website's existence is bound to the account of a particular project member, who might leave the university - which may be regarded critically by a funding application reviewer.
One of the most effective ways of sharing your data is depositing it into a known archive for your institution or discipline. American University Library has a Digital Repository that can be used by AU faculty to share their data, within certain technical restrictions (such as file size).