For lab 2, choose on of the following:
<ul>
  <li>Continued development of keyer;
  <li>Eyeglass-based display.
</ul>
If you choose the eyeglass-based display, for next lab, choose one of:
<ul>
  <li>Light sequencer (display);
  <li>Optics for making it visible in sharp focus.
</ul>
<br>
We will develop a very simple eyeglass-based display, in order to understand
more sophisticated eyeglass-based displays.
<p>
Our simple display will take the form of a
cybernetic timer
that will give you a background awareness of the passage of time.
<p>
The cybernetic timer can be used to:
<ul>
<li>pace a job talk, a lecture, or a conference presentation; or
<li>maintain a subconscious but effective sense of your tempo and pace
    in any of life's many activities.
</ul>
Most inexperienced presenters are too slow getting started, then have to
hurry at the end to catch up.
<p>
A light that flashes once every minute, counting in binary, with 4 lights,
could help you through a 15 minute presentation, by conveying a subtle
sense of time.
<p>
Other tasks that can be helped with a tempo timer:
<ul>
<li>When hammering nails into wood, our tempo tends to slow down and speed up.
    A constant tempo allows us to work more efficiently.
<li>When walking to school, leisurely jogging, or running competitively:
    our tempo tends to be inconsistent, leading to inefficient use of energy.
    Our performance can be improved with a tempo timer.
<li>When entering data, such as when
    typing or playing music, an awareness of tempo,
    running in the background, makes us more efficient.
<li>If playing music with others, a common clock helps everyone stay in time.
</ul>

<h1>Part one: Pace and tempo timer</h1>
Build something that flashes a small light at a steady rate.
This device can be mounted inside eyeglasses as a pacetempo clock.
You can add more lights, e.g. to make a 4-led display.

<h1>Part two: Sequencing</h1>
Many tasks involve a sequence of events.  For example, walking involves
a sequence of steps: "left, right, left, right, ..." and so on.
Playing music involves a sequence of beats such as "one, two, three, four, one,
two, three, four, ...", or "one and two and three and four and one and ...".
<p>
A sequence timer consists of a plurality of lights.  A cybernetic jogging
aid would consist of two lights, one for the left foot and one for the
right food.  For example, a blue LED might flash to indicate when your
left foot should hit the ground, and a red LED might flash to indicate when
your right foot should hit the ground.  For music in 4/ time,
you might have four lights that flash in sequence, one for each beat of a bar.
<p>
Build something that flashes a plurality of lights in sequence, at a steady
rate.
<p>
You can use discrete logic, such as a 7490 and 7441, or you can use a
microcontroller like Atmega 48.
<p>
You might find <a href=http://wearcam.org/ece385/ece385avr_timing_lab2.htm>this ECE385 course page</a> useful, as well as the
<a href=http://wearcam.org/ece385/avr/>Atmega48 pinout, and programmer
construction info</a>.
<p>
Here is an <a href=avr_flashing_lights/>example program that flashes 8 lights in sequence</a>.

<h1>Optics, part one:</h1>
Make a simple device that could be used in eyeglasses to focus an image
of some object, like a small piece of newspaper, onto your field of view,
overlayed onto reality.

<h1>Optics, part two:</h1>
Replace the object with the set of lights from another participant in the lab.