====== Acoustic Navigation And Ranging ======

Like sonar, but not submerged. 

===== Concept =====
Waves transmitted, reflected, received. Add special magic and we have a map of the surroundings...

This project seeks to create this special magic. 

===== Theory =====
Speed of sound in air: V = 331.4 + 0.6T_c  <- speed of sound [m/s], temperature in Celcius

https://secure.wikimedia.org/wikipedia/en/wiki/Speed_of_sound

https://secure.wikimedia.org/wikipedia/en/wiki/Sound_dampening 


===== Hardware =====
http://www.tonews.com/thread/1278041/alt/sci/physics/acoustics/searching_for_a_high_frequency_microphone.html

http://www.americanpiezo.com/standard-products/air-transducers/ultrasonic.html 

http://www.americanpiezo.com/standard-products/air-transducers.html 

Cyclone III kit til 1528:
http://dk.farnell.com/altera/dk-start-3c25n/starter-kit-cyclone-iii-fpga/dp/1428131

EP3C25 FPGA:
http://www.altera.com/products/devices/cyclone3/overview/cy3-overview.html
(25k LEs, 66 M9k mem, 594 kBit embedded memory, blocks, 66 18x18 bit
mults),

Cyclone II kit til 1295:
http://dk.farnell.com/altera/dk-cycii-2c20n/kit-fpga-cyclone-ii-development/dp/1560812
, den er dog noget slanket i forhold til Cyclone III ovenfor.