System and method of monitoring respiratory parameters

A spirometer comprising:

• a housing;
• a mouthpiece coupled to the housing;
• a measurement unit including a fan and a motor, the measurement unit configured to receive air expelled by a user, and generate an electrical quantity corresponding to a peak expiratory flow or a forced expiratory volume based on the expelled air;
• a controller supported by the housing, and configured to receive the electrical quantity from the measurement unit;
• an energy harvester coupled to the measurement unit and the controller, the energy harvester configured to
• receive energy from the measurement unit or an energy device,
• store the received energy in an energy storage device, and
• transfer the energy to the controller;
• and
• an outer ring coupled to the mouthpiece, and wherein the outer ring covers a display when the mouthpiece is in the first position and the outer ring exposes the display when the mouthpiece is in the second position, and
• wherein the housing includes a set of guiderails along a length of the housing, and wherein the mouthpiece is movable relative to the housing between a first position in which the mouthpiece is recessed within the housing, and a second position in which the mouthpiece is exposed outside the housing.