Central control system

Abstract

Provided is a structure which is capable of central control of an electric device and a sensor device and a structure which can reduce power consumption of an electric device and a sensor device. A central control system includes at least a central control device, an output unit, and an electric device or a sensor device. The central control device performs arithmetic processing on information transmitted from the electric device or the sensor device and makes the output unit output information obtained by the arithmetic processing. It is possible to know the state of the electric device or the sensor device even apart from the electric device or the sensor device. The electric device or the sensor device includes a transistor which includes an activation layer using a semiconductor with the band gap wider than that of single crystal silicon.

1 . (canceled) 
     
     
         2 . A sensor device comprising:
 a power switch;   wherein the power switch comprises a transistor comprising an oxide semiconductor layer comprising a channel formation region, and   wherein the sensor device is one selected from the group consisting of a fire alarm, a human detection sensor, a proximity switch, a vibration sensor, a radiation sensor, a surveillance camera, an electricity meter, a water meter, and a gas meter.   
     
     
         3 . The sensor device according to  claim 2 ,
 wherein the sensor device is connected to a central control device by wireless communication.   
     
     
         4 . A sensor device comprising:
 a first power switch;   a second power switch; and   a voltage regulator circuit connected to the first power switch and the second power switch,   wherein each of the first power switch and the second power switch comprises a transistor comprising an oxide semiconductor layer comprising a channel formation region, and   wherein the sensor device is one selected from the group consisting of a fire alarm, a human detection sensor, a proximity switch, a vibration sensor, a radiation sensor, a surveillance camera, an electricity meter, a water meter, and a gas meter.   
     
     
         5 . The sensor device according to  claim 4 ,
 wherein the sensor device is connected to a central control device by wireless communication.   
     
     
         6 . A sensor device comprising:
 a power switch;   a voltage regulator circuit connected to the power switch; and   a load connected to the voltage regulator circuit, the load comprising a sensor,   wherein the power switch comprises a transistor comprising an oxide semiconductor layer comprising a channel formation region, and   wherein the sensor is one selected from the group consisting of a temperature sensor, an optical sensor, a gas sensor, a flame sensor, a smoke sensor, a humidity sensor, a pressure sensor, a flow sensor, a vibration sensor, a voice sensor, a magnetic sensor, a radiation sensor, a smell sensor, a pollen sensor, an acceleration sensor, an inclination sensor, a gyro sensor, a direction sensor, or a power sensor.   
     
     
         7 . The sensor device according to  claim 6 ,
 wherein the sensor device is connected to a central control device by wireless communication.   
     
     
         8 . The sensor device according to  claim 6 ,
 wherein the load further comprises a micro control unit, an amplifier circuit and an AD converter,   wherein the amplifier circuit is configured to amplify an input voltage from the sensor and output amplified voltage, and   wherein the AD converter is configured to convert the amplified voltage to a digital signal and transmit the digital signal to the micro control unit.