Breaking News
Comments
Newest First | Oldest First | Threaded View
green_is_now
User Rank
CEO
re: Energy harvesting tipping point for wireless sensor applications
green_is_now   6/30/2011 8:42:22 PM
NO RATINGS
many applications will not run on 100% harvested power but many other will. The ones that will not operate on 100% harvested power still will benifit because it will extend the life by the proportion of power being supplied via vibrations and/or heat gradients. it can even allow infinite life with reduced dutycycle if coupled with a capacitor even after the battery fails or degrade beyond adding value. This is possible if the battery and capacitor can be switched in independently by the micro based on health monitoring. So even when the battery fails and continuos operation or higher duty cycle with batteries it can still function at a much lower duty cycle. take a bridge strain gauge monitor...these take years to fail and so a once an hour update that was stretched to once a day or week would still have value to the monitoring system and allow high level of safety. Also as a vibration mode changes (think rusted bolt on a bridge or a bad bearing on rotating equipment the vibration waveform and amplitude would change. this could actually add extra power just when it is needed! (assuming the bandwidth and amplitude envelope that can be capture is sufficient.

IanWelch
User Rank
Rookie
re: Energy harvesting tipping point for wireless sensor applications
IanWelch   6/29/2011 2:07:16 PM
NO RATINGS
One thing to consider is the life of the battery. This will ultimately be the limiting factor of the sensor node and will need to be considered when deploying a sensor network.

Dan.Wright
User Rank
Rookie
re: Energy harvesting tipping point for wireless sensor applications
Dan.Wright   6/9/2011 12:39:43 AM
NO RATINGS
Nice article. I've found the bridge time to be a challenge (using super caps). Also keeping the average current as low as possible means a much less transmission rate when occupancy. There are also challenges with LUX level on ceilings which tend to be closer to 50-100 LUX level. Your 51uA with transmission every second for 3 minutes is impressive.

Simpleton
User Rank
Rookie
re: Energy harvesting tipping point for wireless sensor applications
Simpleton   6/8/2011 1:42:58 PM
NO RATINGS
Harvesting energy from sun is not that challeging now a days due to availability of many single chip energy harvesting and power management chips but mostly the sensor networks are installed within building areas where sunlight can hardly reach. If energy harvesting devices becomes more efficient for use in indoor ambient condition harnessing energy from indoor lights or room temperature variations then definitely it will be a great leap in energy harvesting technology.

Chris.Shepherd_#1
User Rank
Rookie
re: Energy harvesting tipping point for wireless sensor applications
Chris.Shepherd_#1   6/8/2011 7:31:46 AM
NO RATINGS
An interesting article which I thought overdid the CPU aspect a bit - I was hoping for more on energy harvesting; but that is Mr Bannatyne's job I suppose.

chanj0
User Rank
CEO
re: Energy harvesting tipping point for wireless sensor applications
chanj0   6/2/2011 5:21:43 PM
NO RATINGS
Wireless sensor node will be adopted widely if it can run on renewable energy source. Efficient energy harvesting is indeed one of the major breakthroughs. Using high efficient solar panel can help to better supply energy. High capacity energy storage is crucial to keep the sensor running while Sun is not available. The cost of ownership will include the maintenance cost. When a company deploys a thousand, there is very little chance that they can run to hunt for the units to replace battery even though the battery energy can keep the unit run for 2-3 years. Harvesting shall not limit to renewable energy source. I have seen product which is able to harvest energy off from open a door or a window. To turn a light switch on has produced enough energy to send a signal to a remote switch to turn on an actual light. It is amazing how energy harvesting technology has gone so far.



Flash Poll
Top Comments of the Week
Like Us on Facebook
EE Times on Twitter
EE Times Twitter Feed

Datasheets.com Parts Search

185 million searchable parts
(please enter a part number or hit search to begin)
EE Life
Frankenstein's Fix, Teardowns, Sideshows, Design Contests, Reader Content & More
Max Maxfield

Energizing the Young Engineers of Tomorrow
Max Maxfield
15 comments
It doesn't seem all that long ago when I was a bright-eyed, bushy-tailed young engineer. Now I feel like an old fool, but where are we going to find one at this time of the day (LOL)?

Jolt Judges and Andrew Binstock

Jolt Awards: The Best Books
Jolt Judges and Andrew Binstock
1 Comment
As we do every year, Dr. Dobb's recognizes the best books of the last 12 months via the Jolt Awards -- our cycle of product awards given out every two months in each of six categories. No ...

Engineering Investigations

Air Conditioner Falls From Window, Still Works
Engineering Investigations
2 comments
It's autumn in New England. The leaves are turning to red, orange, and gold, my roses are in their second bloom, and it's time to remove the air conditioner from the window. On September ...

David Blaza

The Other Tesla
David Blaza
5 comments
I find myself going to Kickstarter and Indiegogo on a regular basis these days because they have become real innovation marketplaces. As far as I'm concerned, this is where a lot of cool ...