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Tree Totally Powers Custom Circuit

Monday, September 14 2009

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From right to left: Electrical engineers Babak Parviz and Brian Otis and undergraduate student Carlton Himes demonstrate a circuit that runs completely off tree power. (Dustin Schroeder/University of Washington)
From right to left: Electrical engineers Babak Parviz and Brian Otis and undergraduate student Carlton Himes demonstrate a circuit that runs completely off tree power. (Dustin Schroeder/University of Washington)
Last year, MIT researchers found that plants generate a voltage of up to 200 millivolts when one electrode is placed in a plant and the other in the surrounding soil. A University of Washington team followed up on this research, and has run a custom circuit entirely off tree power.

By hooking nails to trees and connecting a voltmeter, Carlton Himes, a UW undergraduate student, found that bigleaf maples generate a steady voltage of up to a few hundred millivolts.

The UW researchers next built a device that could run on this available power. Brian Otis, assistant professor of Electrical Engineering, led the development of a boost converter - a device that takes a low incoming voltage and stores it to produce a greater output.

The team's custom boost converter works for input voltages of as little as 20 millivolts, an input voltage lower than any existing such device. It produces an output voltage of 1.1 volts, which is enough to run low-power sensors.

The UW circuit is built from parts measuring 130 nanometers and it consumes on average just 10 nanowatts of power during operation.


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Comments (2)
Tree Power
It occurs to me that they have created a dipole antenna. It is also pretty well known that there are strong oscillations at 60Hz in the earth (as well as VLF radio waves). Reckon they should use an oscilloscope to determine whether or not there is an AC component.
Posted on Wednesday, September 16 2009 by Ron Garrett
Tree Power
Okay you gave us all the idea but it is very skimpy information. What about paralel configurations like a multiple of trees and shared grounds looped together? Instead of a rod what about burying a thin copper plate for much more surface area. Should provide a better pickup. What about trying this out?
Posted on Tuesday, September 15 2009 by Richard Williams

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