Inclusion Criteria:  Clinical diagnosis of type 1 diabetes >0.5 year prior to consent date. Diagnosis of type 1 diabetes is based on the investigator's judgment; C peptide level and antibody determinations are not required. Age 12-18 years and above at the initiation of the system Total daily insulin use of great than 8.0 units per day over a 1-week period Willing and able (access to internet from home) Clinically able to start the AHCL system  Exclusion Criteria:  Pregnancy Untreated diabetes retinopathy, or other causes that in the investigator's opinion , precludes the individual from participating in the trial. Currently in other Clinical Trial