 Study participants will be asked to use the CGM and the study insulin pump provided for approximately 3 to 7 days prior to initiation of the HCL PID-IFB system. All participants with diabetes and the parent guardian of participants 18 years of age will be asked to stay overnight in a hotel while the HCL PID-IFB system is on and to remain close to Stanford University during the day. For participants 18 years of age, designated remote monitors will be asked to receive alerts for low high glucose levels. 