Abstract: Impact at a protective headpiece, for example a protective headpiece, may be characterized in part using an impact sensor including at least one acceleration sensor positioned on the protective headpiece. A microcontroller may be configured to identify and store acceleration sensor data based on the output values of the at least one acceleration sensor. A processor device receives the acceleration and/or deceleration data, and may determine whether the experienced impact force is associated with an impact force magnitude that is within a predetermined head injury range of magnitude. An impact alert may be generated when the impact force magnitude is within the predetermined head injury range of magnitude, wherein a predetermined head injury range of magnitude may be adjustable between a practice setting and a game setting, and wherein the impact alert may be visible to an individual wearing the protective headpiece. An electronic device (e.g.