Difference between revisions of "WSN development overview"

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Latest revision as of 16:51, 11 September 2015

Overview of Technology used for Wireless Sensor Networks (wsn)

  • Self Organizing, Self Healing, FCC approval
  • CC2500 has not 802.15.4 MAC. Contiki support: Only a small project for 2 nodes. Simplicity to be tested, TinyOS to be checked
  • Squibdee openhardware project from Libelium is 'support of Arduino + XBee'. To be used as software example. ArduinoFIO is better design.
  • PowWow based on MSP430 and CC2420 2.4GHz 802.15.4
This combination is well supported by TinyOS, Contiki
Very 'light' (in terms of Software)implementation of mesh WSN :)
CC2420 board not easy to get in good price :(
  • ATmega128RFA1
Is supported by Contiki (TinyOS to be checked)
Used by Synapse in series RF200
Excellent performance but work only with their proprietary firmware.
Used by Dresden in their modules.
Dresden modules start at 20EU with good performance and FCC approval.
JTAG and SPI connectors for Firmware download. They are open for Firmware Development
Disadvantages of ATmega128RFA1: Chip is new, Contiki, TinyOS support might not be mature
It is good idea to create Altium libraries for ATmega128RFA1. Not too hard to design a module, but no FCC and other approvals.
  • Trends on wsn modules:
MSP430 or AVR + CC2420 or other RF is the 'classic' solution. Single-chip is preferred for new modules
Single chip ATmega128RFA1 for the low cost modules
Single chip Freescale ARM7 MC13224 for the performance modules
New star is single chip STM32W108 ARM-Cortex + 802.15.4. Included in Contiki Platforms but not yet in known commercial module




Second scan

  • Mesh network is the choice due to self-healing and range.


Open source

  • Open source environments are appropriate for University and European-founded projects
  • Very interesting but big resources needed to manage the project
  • ITEM [check below] project at Czech Technical university, is the most complete project found up to now...
  • Libelium [check below] commercial products based on open-source

Dust networks

  • Dust Networks [check below] has the best documentation on the wireless-HART protocol which is standardized by ISO.
  • The only provider of wireless-HART, their devices have best characteristics.
  • But Dust Networks does not have any distributor. No price and availability info. Their competition says they are very expensive!

DIGI

  • Digi [check below] XBee modules are sold everywhere at logical prices
  • Many public projects available
  • Digimesh protocol is competitive to wireless-HART
  • Used by intelligent-devices, Libellium
  • Still the best starting point

Synapse

  • Synapse [check below
  • Can not support sleeping mesh
  • Good documentation
  • They do not describe the details of how the SNAP protocol works, in the detail Dust-networks does.
  • No CPU needed, Python Engine is included in the module.
  • Over the air Python application download
  • Nodes are engaged in the mesh network instantly at power-on, out-of-the-box
  • Different modules available with nice price/performance
  • Very good pricing. The lowest cost module at $20 no CPU needed, very good low-power and range characteristics, SNAP-network-protocol and Python-Interpreter included.

SimpliciTI

  • TI very simple OS for wireless networks
  • API and source code for MSP430
  • Peer-Peer capability
  • The route Layer has to be developed, to implement the mesh, based on the peer-peer.

ANT

  • ANT [check below] WSN protocol used for sports devices
  • Professional approach, good network characteristics
  • As it is designed for peripheral devices of an athlete, the range might be LOW.
  • Chips by Nordic for some years and TI starting in 2011
  • Big names including Nike are using it.
  • Available boards only from Sparkfun which is Hobby-electronics oriented.

First approach (check newer text titled: second scan)

  • Most used CPU is MSP430. Mostly BIG devices with 60-90KB Flash
  • Second used CPU: AVR. Here also large Versions with 128KB Flash are used.
  • Most used OS is TinyOS, second is Contiki.
  • Most used RF module is XBEE.
ZigBee network implementation.
Used by amateurs and professionals.
Does not need a wireless Operating system.
Does not need a large processor.
Book Building Wireless Sensor Networks with ZigBee, XBee, Arduino, and Processing
To check if already tested TinyOS to control XBee via AT-commands.
To check Arduino-FIO+XBee and over-air sketch download.
  • Most Used RF chips:
TI CC24xx 2.4GHz ZigBee devices with good support from TinyOS and Contiki
TI CC11xx Sub GHz devices with TinyOs support but not as good as above
  • A large serial flash (~8Mbit) is used to store the golden-image and the new over-air downloaded images of the firmware
  • TinyOS supports over-air programing.
  • TinyOs evaluation and implementation has a rather long learning curve.
  • Companies that make Wireless sensor boards, have also ported and give to customers their version of TinyOs and Contiki.

Overview Links










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