This paper describes the design and development of a breathing sounds monitor that with the function of filtering environmental noise. Because there are some noise sources such as voice and air-conditioner that would interfere with breathing sounds while measuring.
We try to filter out some of the noise by integrating capacitance microphone, pre-amplifier and filter into the hardware. In addition, two input channels are designed, one for picking up the lung sound, another for picking up the environmental noise as reference.
Our purpose is to design a wearable, low costs, and long life time wireless breathing sensor network for homecare application by the integration of breathing sensor and micro-controller together with wireless area network due to the increasing population of elderly people. Therefore, we can not only instantly report the home accident to community control center through VoIP voice system, but also to track and report the collected breathing signal to hospital for data storage through the internet. On the other hand, elderly people can have video/voice integrated communication with doctor through this personalized bio-sensing network for better care and let his(or her) families who work outside cease their worry.