Patent ID: 7812710
Filing Date: 2010-10-12
Classification: H04W,Y02D

Abstract:
1. A wireless sensor for a sensor network of wireless sensors, comprising: a power source; a sensor unit configured to perform (1) a sensing process to sense at least one of environment and circumstance, (2) a first routing process to send first sensing information obtained by the sensing process to a server in accordance with routing information, and (3) a second routing process to send second sensing information from another wireless sensor to the server in accordance with the routing information, when being supplied with power from the power source; a timer set at a set time and including a capacitor to be charged by the power supplied from the power source and performs a time limit operation due to self-discharge of the capacitor; a first control switch which controls the supply of the power to the timer from the power source to make the timer perform the time limit operation at the set time; a rectifier which converts a radio signal from the another wireless sensor into power to output a control signal; and a second control switch which, upon receiving the control signal while the timer is performing the time limit operation, starts the supply of the power from the power source to the sensor unit.