Diabeloop WP6.2 : Crossover Evaluation of Glycemic Control

The study will be conducted in crossover trial, with two 72-hour hospitalization separated by a period Wash-out of at least one week. Each hospitalization is a period of treatment. According to randomization, patients will be provided with either Diabeloop system or the usual system. In both treatment periods: * patients in a situation of sedentarity or physical activity, will be equipped with ActiGraph (measuring motricity) and a ActiHeart ( measuring heart rate) * meals and physical activities will be similar in both periods * the same blood glucose meter will be used throughout the duration of the study. * the capillary blood glucose will be performed : before bolus and 2 hours after a meal, before exercise, in case of hypo or hyper-glycemic episodes and when the patient and / or investigator deem it necessary.