World Library  
Flag as Inappropriate
Email this Article

Sun SPOT

Article Id: WHEBN0004406537
Reproduction Date:

Title: Sun SPOT  
Author: World Heritage Encyclopedia
Language: English
Subject: Macfarlane Observatory, Wireless Sensor Network, Upper-atmospheric models, LiteOS, MiWi
Collection:
Publisher: World Heritage Encyclopedia
Publication
Date:
 

Sun SPOT

Sun SPOTs beside an AA battery

Sun SPOT (Sun Small Programmable Object Technology) was a sensor node for a wireless sensor network developed by Sun Microsystems announced in 2007. The device used the IEEE 802.15.4 standard for its networking, and unlike other available sensor nodes, used the Squawk Java Virtual Machine.

After the acquisition of Sun Microsystems by Oracle Corporation, the SunSPOT platform was supported but its forum was shut down in 2012.[1]

Hardware

The completely assembled device fit in the palm of a hand.

Its first processor board included an ARM architecture 32 bit CPU with ARM920T core running at 180 MHz. It had 512 KB RAM and 4 MB flash memory. A 2.4 GHz IEEE 802.15.4 radio had an integrated antenna and a USB interface was included.[2]

A sensor board included a three-axis accelerometer (with 2G and 6G range settings), temperature sensor, light sensor, 8 tri-color LEDs, analog and digital inputs, two momentary switches, and 4 high current output pins.[2]

The unit used a 3.7V rechargeable 750 mAh lithium-ion battery, had a 30 uA deep sleep mode, and battery management provided by software.[2]

Software

The device's use of Java device drivers is unusual since Java is generally hardware-independent. Sun SPOT uses a small Java ME Squawk which ran directly on the processor without an operating system. Both the Squawk VM and the Sun SPOT code are open source.[3] Standard Java development environments such as NetBeans can be used to create SunSPOT applications. The management and deployment of application are handled by ant scripts, which can be called from a development environment, command line, or the tool provided with the SPOT SDK, "solarium".

The nodes communicate using the IEEE 802.15.4 standard including the base-station approach to sensor networking. Protocols such as Zigbee can be built on 802.15.4. Sun Labs reported implementations of RSA and elliptic curve cryptography (ECC) optimized for small embedded devices.

Availability

Sun Microsystems Laboratories started research on sensor networks around 2004. After some initial experience using "Motes" from Crossbow Technology, a project began under Roger Meike to design an integrated hardware and software system.[4] Sun sponsored a project at the Art Center College of Design called Autonomous Light Air Vessels in 2005.[5] The first limited-production run of Sun SPOT development kits were released April 2, 2007, after months of delays. This introduction kit included two Sun SPOT demo sensor boards, a Sun SPOT base station, the software development tools, and a USB cable. The software was compatible with Windows XP, Mac OS X 10.4, and common Linux distributions. Some demonstration code was provided.

A developer from Sun gave a demonstration in September 2007.[2] After investigating commercial use, Sun moved to focus on educational users. The entire project, hardware, operating environment, Java virtual machine, drivers and applications, was available as open source in January 2008.[3][6][7]

Oracle Corporation acquired Sun Microsystems in 2010 and continued Sun SPOT development, through release 8 of the hardware (with Sun-Oracle logo) by March 2011.[8] The 2011 version included larger memories and a faster processor, but with fewer inputs.[9]

In 2012 the forum said it would be "down for maintenance" until "mid-June".[1] A new forum was started on the Oracle Technology Network on May 7, 2013.[10] David G. Simmons, one of the SunSPOT developers for Sun Microsystems, maintained a blog through the end of 2010.[11] He opened an alternative developers forum in July 2013 not connected to Oracle.[12]

References

  1. ^ a b "The SunSpotWorld Forums are down for maintenance". Oracle Labs. Archived from the original on June 9, 2012. Retrieved November 17, 2013. 
  2. ^ a b c d Simon Ritter (September 24, 2007). "Sun SPOTs In Action". Archived from the original on April 20, 2008. Retrieved November 17, 2013.  Republished in February 2011
  3. ^ a b "spots: SPOTs project". Archived from the original on 2008 through 2012. 
  4. ^ Rob Tow. "Sun "SPOT" Wireless Sensor Networks". Personal web page. Retrieved November 17, 2013. 
  5. ^ Jed Berk and Nikhil Mitter (2006). "Autonomous Light Air Vessels". Retrieved November 17, 2013. 
  6. ^ Austin Modine (January 29, 2008). "Sun open sources doohickeys: Tiny, sensor-driven devices exposed". The Register. Retrieved November 17, 2013. 
  7. ^ "Sun Brings Innovative Sun Small Programmable Object Technology (SPOT) Sensors to Open Source Community; Expands Program to Educational Institutions Around the Globe". Press release (Sun Microsystems). January 29, 2008. Archived from the original on February 3, 2008. Retrieved November 17, 2013. 
  8. ^ Ron Goldman (March 19, 2011). "Spots: Wiki: Home — Project Kenai". Project web site. Retrieved November 17, 2013. 
  9. ^ "SunSPOTWorld - Purchase". Commercial web site. Retrieved November 17, 2013. 
  10. ^ SunSPOT forum at Oracle Technology Network
  11. ^ "On the SPOT: David G. Simmons". Blog. Archived from the original on May 9, 2012. Retrieved November 17, 2013. 
  12. ^ "Sun SPOTs Forums". Alternative non-official developers forum. Retrieved November 17, 2013. 

External links

  • Official website
This article was sourced from Creative Commons Attribution-ShareAlike License; additional terms may apply. World Heritage Encyclopedia content is assembled from numerous content providers, Open Access Publishing, and in compliance with The Fair Access to Science and Technology Research Act (FASTR), Wikimedia Foundation, Inc., Public Library of Science, The Encyclopedia of Life, Open Book Publishers (OBP), PubMed, U.S. National Library of Medicine, National Center for Biotechnology Information, U.S. National Library of Medicine, National Institutes of Health (NIH), U.S. Department of Health & Human Services, and USA.gov, which sources content from all federal, state, local, tribal, and territorial government publication portals (.gov, .mil, .edu). Funding for USA.gov and content contributors is made possible from the U.S. Congress, E-Government Act of 2002.
 
Crowd sourced content that is contributed to World Heritage Encyclopedia is peer reviewed and edited by our editorial staff to ensure quality scholarly research articles.
 
By using this site, you agree to the Terms of Use and Privacy Policy. World Heritage Encyclopedia™ is a registered trademark of the World Public Library Association, a non-profit organization.
 


Copyright © World Library Foundation. All rights reserved. eBooks from Project Gutenberg are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.