Wearable health status monitoring device for electricity workers using ZigBee-based wireless sensor network

A kind of novel wearable health condition monitoring device based on ZigBee technology for electricity workers to improve the safety of working and training is presented, which can monitor the user´s pulse wave and body temperature wirelessly. In this paper, the system architecture, details of the monitoring sensor nodes, hardware design of the ZigBee module and data packet structure definition of wireless communication are introduced. Especially, field experiments were conducted to evaluate the transmission performance of the distance-increased ZigBee module. Several important techniques, including adopting wavelet transform method to process the detected pulse wave signal to remove the noise and baseline wander before calculating the pulse rate and designing a new algorithm of numbering the ZigBee data packet circularly to get larger tolerability of data packet loss when accurate pulse rate is required. Lastly, an application example is given.