Thursday, September 29, 2005

Lab # 2 - PIC programming - LED's lit in sequence

Here are a number of LED's being lit in sequence using a PIC 18F452 chip and a program that lights one at a time for 500 ms. I am attampting to introduce a switch which when engaged, will cause all the lights to be on but thus far, no such luck. First attempts don't often give the desired results.

Observation Project - accommodative "Noise" Reduction

Because noise arises through the din of simultaneous conversation....

The idea for this project occurred to me after having been in places where groups of people, that happen to fluctuate in size at any given time were going about their business as they might do at these locations. A mall, a reception area where a function can be held or a vestibule of a building where people might congregate prior to an event in an adjoining space. The common and expected thing that arises from each of these places is - noise. I generally don't care to have to yell to the person next to me to have a conversation or provide some necessary information, but that often is the case in spaces where people are. The noise level will not always be the same all the time at these places and so, the need to attenuate the noise will vary. The goal is to assist in providing an aural environment where noise can exist as it needs to but not so that it becomes a force to be reckoned with for the sake of any individuals need to be understood or who simply would like to hear themselves think !

The architectural consideration of a given space cannot be ignored so, the system must not only be consistent with design needs but also accommodate the users. It should interact on a realtime basis with the need of the people in the environment, adjusting, for the time necessary.

This system provides for an adjustable mechanism to increase as needed, the acoustic absorptive capability, essentially, of the space. The reduction of competing background noise, helps to maintain a more comfortable overall sound level. More normalized volume levels for conversation are then realized by the occupants. The need to shout over each other is diminished, civility is increased, energy is conserved and more is right with the world.

This is a sketch of a noise reduction unit. It could be mounted on a surface or installed flush in a wall, between wall studs, approx 14-24 " wide. The housing and legnth of prowing absorptive panel could be sized to fit this range.

Sensors to count the number of persons within a space, for reading decibel levels and for frequencies or frequency ranges ( for standing wave problems) would relay threshold information ( perhaps wirelessly) to programmed PIC chip(s) for an individual unit or for an array of units depending upon readings relayed from multiple points. A flow of calculations for the reveal of absorptive materials would be made in regard to the known coefficients of persons within and materials confining the space in question. Based on these calculations the units would be engaged to reveal more or less absorptive material by having the front of the unit prow outward by use of servo motors allowing a covering panel to slide open, revealing various densities of acoustically absorptive materials. Facing of the panels could be of fabric(s) consistent with room decor covering any appearence of mechanism

Friday, September 16, 2005

Lab Assignment No.1 - LED's on Bread

Five pictures showing LED's on a breadboard w/ DC power supply,

a Switch, a Potentiometer, a 7805 5 Volt Voltage Regulator and 220 Ohm resistors.

1.) Red LED w/ DC supply.

2.) Red LED with added Yellow and Green LED's, same DC supply

3.) Red LED switched Off, Potentiometer turned Down

4.) Red LED switched On, Potentiometer turned Down

5.) Red LED switched On, Potentiometer turned Up

Initially, I installed the interchangeable tip of the DC adapter with the wrong polarity and cooked a 7805 or two.
When the smoke cleared, I corrected the polarity problem and Whadya know !, it works.
For lab #1 - You can lead a horse to water but a breadboard must be LED

Wednesday, September 14, 2005

Physical Computing Section 05 - Crawford - The Art of Interactive Design: Chap 1


1.) No, rugs are not interactive. They don’t speak in any intelligible sense. They may add to the décor or detract from it, ( confirm or deny a sense of good taste) but that’s all it will “say”. It can help to absorb sounds but that cannot in any real way be defined as listening and there is no thinking process a rug undertakes.

2.) Interactivity is a reciprocative process of understanding and communication which can aid the ease of use, realized either intuitively or assistively.

3.) I don’t own a copy of this book right now but when I get one I’ll give it a throw.

next.......comment on chap. 2

Physical Computing Section 05

Here's my new PhysComp Blog .. .but...
I'm going to get some sleep now, I'll post later this morning