Wake-up time Measurement of Wireless Sensor Node with Zero Standby-power

The wireless sensor network is a promising technology for environmental monitoring system, earthquake monitoring system, and person tracking system. The battery replacement is one of the problems for the wireless sensor network. To tackle this problem, we have proposed and developed a power saving sensor node which does not consume any power by disconnecting the ground line by MOSFET when sleeping. However, this feature may affect waking up time of the sensor node because the proposed sensor node has to wake-up from the state without any power. In this study, the wake-up time of the proposed sensor node is measured to demonstrate our sensor node can be applied to some application of the wireless sensor network.