Difference between revisions of "Wireless sensor network - Smilenet"
Line 35: | Line 35: | ||
===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 | ||
Line 88: | Line 97: | ||
===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:=== | ||
Line 117: | Line 133: | ||
===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 | ||
− | |||
===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: | ||
− | + | 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 15:13, 9 July 2009
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