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A minimally invasive low-cost actigraph, with simple on-line movements features extraction, but with performance enhanced by off-line post-processing, is proposed. Despite its cost significantly lower, the proposed actigraph has performance similar to commercially available solutions. Moreover, its open downloading system and wireless integration capabilities make it apposite for telemedicine home care settings. The proposed device has been characterized experimentally by comparing its performance with an emerging gold standard in clinical monitoring physical activity assessment.