Difference between revisions of "Wireless sensor network - Smilenet"

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===GPRS:===
 
===GPRS:===
 +
 +
Yes, with Autossh and tunneling
  
 
===Mesh limitations:===
 
===Mesh limitations:===
  
 
number of sensors:
 
number of sensors:
 +
 +
8 temperature and moisture sensors,
 +
 +
8 analog inputs or digital, 1 RS232
 +
  
 
number of nodes per router:
 
number of nodes per router:
 +
 +
several hundreds
  
  
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===Reliability:===
 
===Reliability:===
  
Years in service:
+
Years in service: 1 year
  
Failure rate instrument (years):
+
Failure rate instrument (years):  
  
Packet failure (%):
+
Packet failure (%): Depends on environment
  
 
===Installation procedure:===
 
===Installation procedure:===
 +
 +
Configuration in lab
 +
 +
Power on
 +
 +
Range test in field, handheld radio for communication
 +
  
 
===Installation underground possible:===
 
===Installation underground possible:===
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===Maintenance required /Ease of maintenance:===
 
===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
  
=== Support:===
 
  
 
===Software:===
 
===Software:===
  
 
Web friendly interface:  
 
Web friendly interface:  
 +
 +
Yes,
 +
Webpage with graphics based on Gnuplot
  
  
 
Data base:
 
Data base:
  
 +
No, future optional
  
 
Scripting language:  
 
Scripting language:  
  
Ease of update:
+
No, future optional
 +
 
 +
Update in the field:
 +
 
 +
Yes, but only with wired connection, wireless update is future option
  
 
Open source:
 
Open source:
 
+
 +
Yes (Linux, gnuplot, mysql)
  
 
===Cost (non profit):===
 
===Cost (non profit):===

Revision as of 16:13, 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:

Yes, with Autossh and tunneling

Mesh limitations:

number of sensors:

8 temperature and moisture sensors,

8 analog inputs or digital, 1 RS232


number of nodes per router:

several hundreds


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: 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


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

Distributors


References