//////////////////////weblog

outlt – final presentation

May 7th, 2008 admin

project overview

Bearing no dependencies on the power or data infrastructure this project, known as ‘outlet’, is an autonomous device that aims to appropriate both virtual and physical spaces. Comprised of a wind-generator designed for urban deployment mated with a highly efficient portable web-server this device creates virtual ‘islands’ within urban environments. Hosting a public messaging interface, users who engage the system are encouraged to leave their thoughts, opinions, or any other form of written expression on the publicly available message board. The written entries are then vocalized by an internal speaker allowing those individuals in the physical space surrounding the portable server to passively participate in the mediated discussion. The anonymity and transparency of the entire process encourages participants to broadcast their opinions freely in public spaces. The untethered nature of this virtual experience explores the realms of free speech and the temporary autonomous zone.

general interaction diagram

web interface [follow this link to find a working sample of the web interface]

technical overview

The primary technical aspect of this project is comprised of a Gumstix embedded Linux computer. Within this small computer that is mounted on the tail-fin of the wind generator there is a highly efficient BOA web-server. With the use of simple Perl based CGI scripts, the virtual message board is able to exist on such a minimal platform. Using a compact flash based 802.11 b/g wireless adapter the unit is able to be seen as a wireless access point in virtual space.

This project is able to autonomously exist due to the onboard wind generator that converts ambient energy in the form of wind into a stable electric current. A bearing has been installed into the structure of the wind generator allowing for the unit to automatically orient itself allowing for the strongest possible windflow to engage the blades.

Below is a simple breakdown of the power delivery circuit:

* Ambient energy rotates blades of wind-generator. The blades are connected to a 7:1 ratio gearbox that is connected to a small DC motor.

* Low voltage / low current signal created by the generator are passed to the MAXIM 856 integrated circuit (IC). This IC accepts low voltage / low current signals. With the aid of an inductor a 5V / 100 mA signal is output.

* The 5V / 100 mA signal is then accepted by the Maxim 1555 IC that mediates that charging of a 2000 mAh battery. This battery outputs 3.8 volts when fully charged.

* The output from the batter is then passed through the MAXIM 1771 IC which converts the 3.8 V signal incoming from the battery into a 5.0 V signal, satisfying the requirements of the onboard web-server.

* With no wind and at full battery charge the system is able to remain operational for approximately 30 minutes.

Select technical components are displayed in the image gallery below

general image gallery

technical presentation [1/2]

conceptual presentation [2/2]

Posted in home, networked objects, sustainable | No Comments »

climate change and the solar cycle.

February 28th, 2008 admin

for my class discussion, i selected the topic of the solar cycle and its effect on global climate change. although there is significant support for the greenhouse effect, few are informed of the alternative theories which can also explain our changing terrestrial climate.

in this discussion i first introduced the solar cycle in order to explain the various states of our sun (solar maximum, solar minimum). these states essentially describe the the magnetic activity of the sun due to internal solar flows. solar maximum is commonly known as it is at this state where one is able to identify ’sun spots’ on the solar surface. these dark spots represent regions of heightened magnetic activity and are characteristically cooler then the surrounding areas. the cooler temperate of these regions explains the formation of ’spots’ on the solar surface.

the theory which links the solar cycle to global climate change is based upon the fact that at solar maximum (where the sun is at maximum magnetic activity) the earth is shielded from cosmic radiation that is able to penetrate within our atmosphere. cosmic radiation is hypothesized to have the ability to ionize water particles in the troposphere increasing the occurrence of cloud formation. to clarify, high solar magnetism prevents cosmic radiation from entering the atmosphere reducing cloud formation where as periods of low solar magnetism are conducive to increased levels of cosmic radiation within the atmosphere leading to an increase in cloud formation. water vapor is the most abundant greenhouse gas found within our atmosphere, and one can not deny the sticking link that does present itself between the solar cycle and changes in global climate.

please refer to the links below for additional information regarding this issue.

Inﬂuence of Cosmic Rays on Earth’s Climate. Henrik Svensmark

Reply to Lockwood and Fröhlich – The persistent role of the Sun in climate forcing. Svensmark, H. and Friis-Christensen, E.

solar variation. wikipedia.

Posted in home, sustainable | No Comments »

energy flow – 2007 formula 1

February 27th, 2008 admin

this assignment asked us to explore the flow of energy within a given medium. as a follower of formula 1 racing, i took this opportunity to understand how these expressions of the most advanced automotive development are able to sustain unprecedented levels of performance through a specific focus on the over-all energy associated with the vehicle.

please follow this link to view my presentation notes in pdf format.