The overall aim of this proposed research is to determine the safety, feasibility and efficacy of the Diabetes Assistant (DiAs) controller in day and night closed-loop control in children and adolescents with type 1 diabetes over multiple days in a diabetes camp setting. This will be addressed in two parts: 1) An in residence, outpatient study to determine safety and feasibility of the DiAs during 72 continuous hours of day and night glucose control; and 2) Camp studies planned for the summer of 2014 with randomization to either full closed-loop or sensor-augmented pump therapy over the duration of 6-7 day diabetes camps.