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In this paper we present the design of a low-cost system that can be used to monitor physiological parameters, such as temperature and heart rate, ofa human subject. The system consists of an electronic device which is worn on the wrist andfinger, by an elderly or at-risk person. Using several sensors to measure different vital signs, the person is wirelessly monitored within his own home. An impact sensor has been used to detectfalls. The device detects if a person is medically distressed and sends an alarm to a receiver unit that is connected to a computer. This sets offan alarm, allowing help to be provided to the patient. The device is battery poweredfor use indoors. The device can be easily adapted to monitor athletes and infants. The low cost ofthe device will help to lower the cost of home monitoring ofpatients recoveringfrom illness. A prototype of the device has beenfabricated and extensively tested with very good results.

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