Difference between revisions of "Wireless sensor network - Smilenet"

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[[Image:image1.jpg|right|200px|Wireless sensor network - image 1]]
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[[Image:image1.jpg|right|400px|Wireless sensor network - image 2]]
[[Image:image2.jpg|right|400px|Wireless sensor network - image 2]]
 
 
Wireless sensor network
 
Wireless sensor network
  
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===Summary:===
 
===Summary:===
 +
Smilenetz means Soil Moisture Intelligent Long-Range Environmental Network
  
 
===Radio frequency used:===
 
===Radio frequency used:===
 
+
868 MHz and 2.4 GHz
  
 
===Radio protocol used:===
 
===Radio protocol used:===
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300 m wet forest
 
300 m wet forest
  
868 MHz
+
at 868 MHz with 300 mW and quarter wave antenna
  
300 mW TX power
 
 
l/4 antenna
 
  
  
 
===Hop modes:===
 
===Hop modes:===
  
Point-to-multipoint
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Point-to-multipoint or Zigbee dependent on
 
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radio module
Zigbee (not reliable)
 
  
  
 
===GPRS:===
 
===GPRS:===
  
Yes, with Autossh and tunneling
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GPRS modem at gateway
  
 
===Mesh limitations:===
 
===Mesh limitations:===
  
number of sensors:
 
 
8 temperature and moisture sensors,
 
 
8 analog inputs or digital, 1 RS232
 
 
 
number of nodes per router:
 
 
several hundreds
 
  
  
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Frequency counter
 
Frequency counter
  
Future: I2C, SDI12 ?
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RS232
 +
 
 +
Future options: SDI12, I2C, SPI
  
  
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Data format: plain ASCII text file
 
Data format: plain ASCII text file
 +
 +
Future option: database
  
 
===Power consumption:===
 
===Power consumption:===
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Active mode with radio RX: 50 mA
 
Active mode with radio RX: 50 mA
  
Active mode with radio TX: 150 mA
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Active mode with high power radio TX: 150 mA
  
  
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Range test in field, handheld radio for communication
 
Range test in field, handheld radio for communication
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 +
Monitoring software for incoming packets including RSSI
  
  
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Other related web sites:
 
Other related web sites:
  
Technical information
+
Technical information: http://www.mx.hs-mannheim.de
  
 
Distributors
 
Distributors

Latest revision as of 18:47, 13 June 2010

Wireless sensor network - image 2

Wireless sensor network


Method:

Summary:

Smilenetz means Soil Moisture Intelligent Long-Range Environmental Network

Radio frequency used:

868 MHz and 2.4 GHz

Radio protocol used:

Range/Power (line of sight/dBm):

20 km line of sight

300 m wet forest

at 868 MHz with 300 mW and quarter wave antenna


Hop modes:

Point-to-multipoint or Zigbee dependent on radio module


GPRS:

GPRS modem at gateway

Mesh limitations:

Additional information:

Sensor compatibility:

1 Wire

Digital IO

8 channel 10 bit AD converter, 0 to 2.5V

Frequency counter

RS232

Future options: SDI12, I2C, SPI


Data reading frequency:

Adjustable, e.g. 30 s, 1 min, 15 min


Storage of data/backup:

SD card on node (e.g. 2 GByte)

CF card on Gateway (4 GByte)

Server with database on Internet

Data format: plain ASCII text file

Future option: database

Power consumption:

Sleep mode: about 40 uA

Active mode without radio/sensor: 8 mA

Active mode with soil moisture sensor: 50 mA for 400 ms

Active mode with radio RX: 50 mA

Active mode with high power radio TX: 150 mA


Reliability:

Years in service: 1 year

Failure rate instrument (years):

Packet failure (%): Depends on environment

Installation procedure:

Configuration in lab

Power on

Range test in field, handheld radio for communication

Monitoring software for incoming packets including RSSI


Installation underground possible:

yes

Battery life:

1 min interval: 2 weeks

90 min interval: approx. 2 years

Battery type

4x AA, 6V (5.2 V)

Sanyo Eneloop NiMh rechargeable, 2000 mAh, self discharge about 15% in 1 year

Alkalines as well (solar power optional in future)


Maintenance required /Ease of maintenance:

Change of battery required

Support:

Yes, but research institution

Software debug: Monitor mode to see all raw data, over the air programming in future


Software:

Web friendly interface:

Yes, Webpage with graphics based on Gnuplot


Data base:

No, future optional

Scripting language:

No, future optional

Update in the field:

Yes, but only with wired connection, wireless update is future option

Open source:

Yes (Linux, gnuplot, mysql)

Cost (non profit):

30 Euro microcontroller board

15 to 50 Euros radio (depending on frequency and power)

Gateway: 135 Euro embedded pc +30 to 65 Euro for radio modem

GPRS: 150 Euro

Communication costs: 0.2 Euro for 1 MByte



What to watch out for:

Problems/Questions:

Links

Projects that used the above equipment:


Other related web sites:

Technical information: http://www.mx.hs-mannheim.de

Distributors


References