We report a wireless Sensor network (WSN) for monitoring patient's physiological signal continuously using Zigbee. The output of biosensor has to be transmitted via Zigbee and the same has to be sent to the remote wireless monitor for acquiring the observed patient's physiological signal. The remote wireless monitor is constructed of Zigbee and personal computer (PC). The measured signal has to be sent to the PC for data collection. When the measured signals over the standard value, the personal computer sends Global system for Mobile communication (GSM) short message to the caretaker. Although Bluetooth is better than Zigbee for transmission rate, but Zigbee has lower power consumption. Hence, Zigbee is generally used for 24 hours monitor of communication transmission system. The first procedure of the system is that the biosensor is used to measure heart rate, respiration rate and blood pressure from human body using Zigbee. This measured signal is to be sent to the PC via the RS-232 serial port communication interface. It can send the signal to remote PC or PDA from the internet. In particular, when measured signals over the standard value, the personal computer will send GSM short message to absent care taker's mobile phone.
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