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MICA2 - WIRELESS MEASUREMENT SYSTEM

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MICA2

The MICA2 Mote is a third
generation mote module used for
enabling low-power, wireless,
sensor networks. The MICA2
Mote features several new
improvements over the original
MICA Mote. The following
features make the MICA2 better
suited to commercial deployment:
· 868/916MHz, 433 or 315MHz
multi-channel transceiver with
extended range · TinyOS (TOS) Distributed
Software Operating System v1.0
with improved networking stack
and improved debugging
features · Support for wireless remote
reprogramming · Wide range of sensor boards
and data acquisition add-on
boards ·Compatible with MICA2DOT
(MPR500) quarter-sized Mote

Processor and Radio Platform
(MPR400CB):

The MPR400CB is based on the
Atmel ATmega 128L. The
ATmega 128L is a low-power
microcontroller which runs TOS
from its internal flash memory.
Using TOS, a single processor
board (MPR400CB) can be
configured to run your sensor
application/processing and the
network/radio communications
stack simultaneously. The
MICA2 51-pin expansion
connector supports Analog Inputs,
Digital I/O, I2C, SPI, and UART
interfaces. These interfaces
make it easy to connect to a wide
variety of external peripherals.

Sensor Boards:

Various sensor and data
acquisition boards are available
from Crossbow . These boards
connect to the MICA2 through
a surface mount 51-pin connector.
Crossbow supplies the following
sensor boards:
· MTS101CA Photocell/
Thermistor/Proto and
Experiment Board · MTS300CA/MTS310CA Photocell,
Thermistor, Microphone,
Sounder, Magnetic (310 only),
Acceleration (310 only) · Contact Crossbow for
information on other boards

Base Stations:

A base station allows the aggregation of
sensor network data onto a PC or other
computer platform. Any MICA2 node
(MPR400CB) can function as a base
station by plugging the MPR400CB
processor/radio board into a standard
PC interface board, known as the Mote
Interface Board (MIB510CA). The
MIB510CA provides a serial interface for
RS-232 as well as a parallel port
programming interface for the Motes.
Crossbow also offers a stand-alone
gateway solution, the MICA-WEB for
both TCP/IP-based Ethernet networks
and serial networks.

In this work, a wireless measurement system based on wireless sensor networks (WSN) was developed for large bridges. The general architecture of the wireless system is introduced; the design of wireless nodes and the principle of the central station are given in detail. Experiments are carried out in the laboratory and Nanjing Bridge IV Yangtze River to verify the performance of the designed system. Experimental results show that the performance of the designed system is improved over the transmission distance. The system's anti-blocking capability and packet loss rate of data transmission are also improved compared to traditional wireless sensor systems. Meanwhile, with the external detection interfaces, the system has superior performance in features of high sensitivity and ultra low frequency. You can quickly and easily perform the detection of structural vibrations for a large bridge in its construction, future operation and maintenance periods with a great practicality and high value of application.

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