FEEIT WSN Testbed: Effective System for Providing Emergency Situations’ Prevention and Surveillance - Application and Multidisciplinary Aspects of Wireless Sensor Networks - page 243

Table 11.1 Testbed hardware components
Equipment Scenario Comments about testbed hardware components

Sun SPOT [ 1 ] 1, 3, 4,

and 5

- Problems with frequent restarting
- Provides unstable output voltage
- Problems for deploying an application
'over-the-air' (without connected Sun
SPOTs on USB cable)
- Interference sensitive

Temperature sensor - Phidgets
SKU#33440 [ 8 ]

1 - Needs proper calibration

- The temperature sensor component is
rated at −50°C to +150°C, but the other
components on the board, the connector and
the cable, are rated at −30°C to +80°C

Smoke sensor MHz-11 [ 9 ] 1 and 5 - Highly sensitive

- Needs proper calibration
- Provides stabile digital and analog output

Speed sensor - tachometer
SERVO TEK S-60
-P1104 [ 2 ]

3 - Specific wiring and connectors needed

- Provides accurate results

Distance sensor - ultrasound
distance sensor EZ0 [ 3 ]

3 - Problems when using the Sun SPOT battery

- Requires separate batteries and specific
connectors and wiring

Phidgets Precision Light
Sensor [ 10 ]

4 - Needs proper calibration

Temperature and humidity
sensor - Precon HS
-2000V [ 5 ]

4 and 5 - Needs proper calibration (different sensors

give diverse results)

Motion sensor - Phidgets
SKU#33080 [ 4 ]

4 - Needs proper calibration

- Sensitive to around 8m

Hitech Sound Sensor [ 7 ] 4 - Measures only above 80 dB

Wind speed and wind
direction sensor
A100L2 [ 6 ]

5 - Need to use universal board for connecting

two wires from the anemometer to GND on
the Sun SPOT (analog output is used)
- Need to use condenser, like a filter, for
more stable output voltage

Active Wave RFID kit [ 11 ] 1 - Incomplete version of the provided software

- Asset tags encounter problems when
entering into a local database

Anviz, OC200 RFID [ 13 ] 1 - Could not be connected by a network cable

to PC, only by serial RS232 port
- The reader data cannot be extracted into a
separate database

GAO RFID reader and
antenna [ 12 ]

2 - There is a minimum size limit for the tags

- The reader needs an upgrade to be installed

GSM Module Cel-00757 and
GSM Evaluation Board
CEL-00477 [ 14 ]

1, 3, 4,
and 5

- Working with AT commands via SerialPort
- Using SMSLib library

XBee-Pro [ 15 ] 4 - Problem with power supply (work on

adapter/battery)

HPS-120 [ 16 ] 4 - Works properly

WLAN-Box (W21133) [ 17 ] 4 - Requires establishing virtual WLAN

connection