SENSOR NODE

• US 20120139750A1
• Filed: 02/10/2012
• Published: 06/07/2012
• Est. Priority Date: 05/30/2007
• Status: Abandoned Application

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: HAYAKAWA, Miki, Moriwaki, Norihiko, Yano, Kazuo, Tsuji, Satomi, Ohkubo, Norio
• Application Number:
  US13/370,788
• Publication Number:
  US 20120139750A1
• Time in Patent Office: Days
• US Class Current: 340/870.03
• CPC Class Codes: H04Q 2209/40 using a wireless architecture
• CPC Class Codes: H04Q 2209/845 where the measuring is synchronized between sensing devices
• CPC Class Codes: H04Q 2209/88 Providing power supply at the sub-station
• CPC Class Codes: H04Q 9/00 Arrangements in telecontrol or telemetry systems for selectively calling a substation from a main station, in which substation desired apparatus is selected for applying a control signal thereto or for obtaining measured values therefrom

Abstract

There is disclosed a sensor node capable of transmitting and receiving a large amount of data or data desired to be reliable without missing data, while preventing battery exhaustion and unnecessary compression of the transmission bandwidth. A name-tag type sensor node includes a detector for detecting connection of an external power supply. When the detector detects that the external power is supplied, the name-tag type sensor node transmits and receives a large amount of data, such as bulk transmission data, at an increased frequency by means of a data selector, a communication timing controller, and a wireless communication controller. Alternatively, the name-tag type sensor node transmits and receives the data desired to be reliable, such as rewriting data of firmware.

Claims

1. A sensor node for measuring and transmitting physical quantities, comprising:

a controller for controlling the measurement of the physical quantities by driving a plurality of sensors; and

a communication circuit for transmitting physical quantity data obtained by the controller from the plurality of sensors via wireless or wired communication,

wherein each of the sensors includes a plurality of infrared transceivers for detecting that the sensor nodes face each other, and

wherein the plurality of infrared transceivers are mounted on the sensor node at different angles, and

wherein transmitters or receivers of the plurality of infrared transceivers are operated in a time-sharing manner.

2. A sensor node for measuring and transmitting physical quantities, comprising:

a controller for controlling the measurement of the physical quantities by driving a plurality of sensors; and

a communication circuit for transmitting physical quantity data obtained by the controller from the plurality of sensors via wireless or wired communication,

wherein each of the sensors includes a plurality of infrared transceivers for detecting that the sensor nodes face each other, and

wherein the plurality of infrared transceivers are mounted on the sensor node at different angles, and

wherein the sensor node obtains information about the direction of another sensor node which faces each other.