is a wireless sensor network that monitors the environmental conditions such as
light, temperature, and humidity. This network is comprised of nodes called "motes"
that form an ad-hoc network to transmit this data to a computer that function
as a server. The server stores the data in a database where it can later be retrieved
and analyzed via a web-based interface. The network works successfully with an
implementation of one sensor mote.
The technological drive for smaller devices using less power with greater functionality
has created new potential applications in the sensor and data acquisition sectors.
Low-power microcontrollers with RF transceivers and various digital and analog
sensors allow a wireless, battery-operated network of sensor modules ("motes")
to acquire a wide range of data. The TinyOS is a real-time operating system to
address the priorities of such a sensor network using low power, hard real-time
constraints, and robust communications.
first goal of WISENET is to create a new hardware platform to take advantage of
newer microcontrollers with greater functionality and more features. This involves
selecting the hardware, designing the motes, and porting TinyOS. Once the platform
is completed and TinyOS was ported to it, the next stage is to use this platform
to create a small-scale system of wireless networked sensors.
There are two primary subsystems (Data Analysis and Data
Acquisition) comprised of three major components (Client, Server, Sensor Mote
There are two top-level subsystems -
This subsystem is software-only (relative to WISENET). It relied
on existing Internet and web (HTTP) infrastructure to provide communications between
the Client and Server components. The focus of this subsystem was to selectively
present the collected environmental data to the end user in a graphical manner.
The purpose of this subsystem is to collect and
store environmental data for later processing by the Data Analysis subsystem.
This is a mix of both PC & embedded system software, as well as embedded system
hardware. It is composed of both the Server and Sensor Mote Network components.
WISENET includes a socketed evaluation board
(CC1010EB) and two evaluation modules (CC1010EM). The evaluation board provided
access to all of the analog and digital pins on the CC1010, as well as two serial
ports, a parallel programming port, RF network analysis ports, and other peripherals.
Each evaluation module featured the CC1010, RF network hardware, an antenna port,
and an analog temperature sensor. The modules connected to the evaluation board
via two TFM-D sockets. These sockets also allowed the possibility of designing
a custom expansion board.
WISENET is designed to measure light, temperature,
and humidity. There are many digital temperature sensors available, but there
is a much smaller selection of digital humidity and light sensors. A larger selection
of analog sensors are available; however, analog sensors tended to require more
power and be less precise than their digital counterparts, in addition to requiring
more complex circuitry. For these reasons, digital sensors are given higher priority.
Two new sensors provided the required functionality. First, Sensirion released
the SHT11, a digital temperature and humidity sensor with ultra low power consumption
(550 MicroA while measuring, 1 MicroA when in sleep mode), a 14 bit analog to
digital converter, and the desired accuracy (±5% relative humidity, ±3ºC).
It also featured a simple serial interface.
light sensor chosen was the Texas Advanced Optoelectonic Solutions (TAOS) TSL2550
ambient light sensor with SMBus interface. This sensor also featured ultra-low
power (600 MicroA active, 10 MicroA power down), a 12-bit analog to digital converter,
and dual photo diodes. The TSL2550 uses both photo diodes to compensate for infrared
light and to produce a measurement that approximates the human eye response.
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