This paper presents a wireless, medical network system for vital signs monitoring with a low-power wearable sensor node. The proposed implementation consists of a master sensor board, a sensor node and a gateway (mobile or fixed). The master board has a microcontroller (MeU) for signal processing, a Bluetooth low energy (BLE) module for data transmission, and a power management circuit for charging a 120 mAh rechargeable battery. The sensor node, with a temperature sensor and a photoplethysmography (PPG) sensor, is aimed to be attached to the subject's chest to measure the vital signs, including heart rate (HR), respiration rate (RR) and body temperature. Experimental results demonstrate that the proposed wearable device can monitor and transmit the subject's vital signs to the gateway for data storage and further healthcare analysis.
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