In what follows, we describe three sensor
network projects, and illustrate the above issues.
6.1 The Great Duck Island Experiment
Objective
Intel Research Laboratory at Berkeley, in cooperation with the College of
the Atlantic at Bar Harbor, and the University of California at Berkeley,
deployed on the Great Duck Island, Maine a sensor network consisting of over
21 Chapter 1 Design of Large-scale Sensor Networks
Aravind Iyer et al.
150 sensor nodes [48, 50, 47]. The sensor network was designed to collect the
data at nesting burrows used by Leach??™s Storm Petrel, a particular species
of duck. The main objective of developing this sensor network was to study
in a non-intrusive way, (i) the occupancy of the burrows by these ducks,
and (ii) the role of the micro-climatic factors in their habitat selection. Two
sets of experiments were carried out, one in summer 2002 and another in
summer 2003. We focus our attention on the details of the experiments from
summer 2003. However we also note some important observations made from
the experiments in summer 2002.
Node Architecture
The experiment used several Mica2Dot sensor nodes, running the TinyOS
operating system [52]. The Mico2Dot is a repackaged Mica2 sensor node developed
by Crossbow Inc. [53]. The Mica2Dot uses an ATmega128 microcontroller
at 4MHz with 512 KB of memory, and a 433 MHz radio with a data
rate of 40Kbps. All the sensing elements, namely, the photoresistive light sensor,
the digital temperature sensor, the capacitive humidity sensor, the digital
barometric pressure sensor, and the infrared detector, were integrated into a
single sensor board.
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