Difference between revisions of "Wireless sensor network - Smilenet"

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(New page: right|200px|Wireless sensor network - image 1 right|400px|Wireless sensor network - image 2 Wireless sensor network ==Method:== ===Summary:=== ...)
 
Line 15: Line 15:
  
 
===Range/Power (line of sight/dBm):===
 
===Range/Power (line of sight/dBm):===
 +
 +
20 km line of sight
 +
 +
300 m wet forest
 +
 +
868 MHz
 +
 +
300 mW TX power
 +
 +
l/4 antenna
  
  
 
===Hop modes:===
 
===Hop modes:===
 +
 +
Point-to-multipoint
 +
 +
Zigbee (not reliable)
  
  
Line 32: Line 46:
  
 
===Sensor compatibility:===
 
===Sensor compatibility:===
 +
 +
1 Wire
 +
 +
Digital IO
 +
 +
8 channel 10 bit AD converter, 0 to 2.5V
 +
 +
Frequency counter
 +
 +
Future: I2C, SDI12 ?
  
  
 
===Data reading frequency:===
 
===Data reading frequency:===
 +
 +
Adjustable, e.g. 30 s, 1 min, 15 min
  
  
 
===Storage of data/backup:===
 
===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
  
 
===Power consumption:===
 
===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 radio TX: 150 mA
  
  
Line 55: Line 98:
 
===Installation underground possible:===
 
===Installation underground possible:===
  
 +
yes
  
 
===Battery life:===
 
===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)
  
  
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===Cost:===
+
===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
 +
 
  
  

Revision as of 16:04, 9 July 2009

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Wireless sensor network


Method:

Summary:

Radio frequency used:

Radio protocol used:

Range/Power (line of sight/dBm):

20 km line of sight

300 m wet forest

868 MHz

300 mW TX power

l/4 antenna


Hop modes:

Point-to-multipoint

Zigbee (not reliable)


GPRS:

Mesh limitations:

number of sensors:

number of nodes per router:


Additional information:

Sensor compatibility:

1 Wire

Digital IO

8 channel 10 bit AD converter, 0 to 2.5V

Frequency counter

Future: I2C, SDI12 ?


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

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 radio TX: 150 mA


Reliability:

Years in service:

Failure rate instrument (years):

Packet failure (%):

Installation procedure:

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:

Support:

Software:

Web friendly interface:


Data base:


Scripting language:

Ease of update:

Open source:


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

Distributors


References