The invention discloses a pulmonary function meter, comprising a
mobile phone and a pulmonary function sensor, wherein the pulmonary function sensor comprises an outer shell; the lower side of the outer shell is provided with a blowing
nozzle; the left side or the right side of the outer shell is provided with an air outlet; the upper side of the outer shell is provided with a plug; a rotor and a
stator are arranged in the outer shell; the rotor is located at the right upper part of the blowing
nozzle; the
stator is located at the right upper part of the rotor; the pulmonary function sensor is connected with a
mobile phone circuit through the plug. The working principle is as follows: an user breaths towards the blowing
nozzle, the air flow is blown in from the blowing nozzle to drive a rotary blade to rotate; as the rotary blade is made of magnetic materials, when the rotary blade is rotated, an electro-magnetic induction is generated between the rotary blade and a coil, a current
signal is generated in the coil; and the current
signal is transmitted to the
mobile phone through the plug, the
microphone (mic) current receiving, wave filtering and
spectrum analysis are performed by the mobile phone, and are compared with the data implanted in the mobile phone in advance, thereby the condition of the pulmonary function is obtained. The pulmonary function meter provided by the invention is simple in structure, convenient to use, good in use effect, low in cost, and can be popularized and applied.