Okay now that I know the concept works, the micro code is decent (have
plans for minor improvements) and some LCD (parallel) displays on
order for more hardware development (a controller box)...

Things I need improvements on:

1) brighter LEDs.. I know of a few sources and it's hit or miss trying
to determine the angle and output. This place
<http://www.superbrightleds.com/leds.htm> has good information but the
prices seem high. This place
<http://www.mpja.com/products.asp?dept=116> has good prices but is
missing the angle.

2) Louder speakers. I don't wanna go crazy and think I already have a
solution from a local electronic store. I am not doing anything
fance.. in fact it's just a square wave and the current flow is always
one direction from the source to the speaker. The *project* speaker is
rated for 0.2watts and 8ohm impedance and reversing the math:

(assuming voltage drop ~0.5V, ~4.5V available, P=0.4watts as square
wave and 50% duty cycle for RMS value of 0.2watts)

R=E^2/P R=50 (I = ~0.1 amp)

Assuming the 8ohm speaker impedance will never be below 8ohms -- I
should be able to use a ~42ohm current limiting resistor for my simple
bleeps and beeps and be safe. (the math seems right to me)

It would be nice to get 90db SPL (A weighted) at 1 meter from the box
but I'd settle for 80+. I haven't measured the output of the boxes
with the radio shack (temp purchase unfortunately) speaker I got
installed now. But I'd figure closer to 65-70dB SPL.

Hardware re-designs are fun aren't they? NOT! With software you just
program the code and your done.. Have to re-build some stuff now and
prolly re-design the PCB to use transistor to drive the LEDs instead
of straight off the MCU output line (with current limiting resistors).

--Doug