Design and Development of Real Time Respiratory Rate Monitor Using Non-invasive Biosensor

Respiration Rate is one of the vital signs which require regular monitoring among diseased people. There are a number of medical devices developed to monitor human health condition among them RR monitor is one. The Respiration rate monitor is a device that measures the subject’s respiration rate non-invasively. The objective of the proposed work is to design and develop a low cost Respiration rate monitor for clinical applications. The main parameter to be used is the temperature of respired air i.e. both inspired and expired air. Hence this device uses Thermistor as the source sensor which will provide the temperature feedback of the inspired and expired air. The proposed work uses the ATMEL AT89S52 microprocessor with external ADC0809. The magnitude voltage during the inhalation and exhalation is converted into digital signal using ADC. The further process involves a peak detection technique. The number of peaks obtained in duration of one minute gives the Respiration Rate. The so obtained Respiration Rate is sent to the concerned physician’s cell phone through GSM modem. The device gives an alarm and sends request via SMS if there is tachyopnea and bradyapnea.