..., etc.

====== Notes dumping place for possible Arduino speed-log ======

**ALL DEPENDS on proven functionality of the speed transducer- first things first, remove transducer and test...**

  * Planned platform is Arduino NANO with Serial LCD.
  * Arduino Mini is cheaper by %50 apparently... but requires additional USB connection- PICAXE USB cable may be suitable.
  * Important is display type- black on white is best for sunlight conditions.  Backlight also required.  Maybe white on blue would work well in sunlight?
  * Important is character support- LARGE NUMBERS are necessary.
=== Basic Functional description ===

  * X Buttons for functions Y
  * Calibration mode, 1 nautical mile, 1/2 nautical mile
  * For now it seems that traveling 1 mile and counting the number of transducer clicks will provide an adequate average result
  * Once the number of clicks for 1 n. mile is found, math is Distance in n. mile divided by time in hours = Speed in  knots, choose a very small unit of time to count clicks for to allow fast updates of speed calculation (2s?)

Best I can get this described in ASCII:
<tab><blockquote>
D = distance in nautical miles

T = time in hours

S = speed in knots

D/T = S

X = Number of clicks counted while traveling a calibration mile

Y = Number of clicks counted in a single sample period

Z = Sample period in Seconds

D = Y/X * 1 n.m.

T = Z/3600

So:  (Y/X * 1 n.m.) / (Z/3600) = Speed in knots for the sample period Z

E.G.  If we calibrate 1 n.m. at 2500 clicks (X=2500) and our sample/update period is 2 seconds (Z=2), and over that period we count 10 clicks (Y=10), then calculated speed would be (10/2500)/(2/3600) = S = 0.004 / 0.0006 = 6.67 knots.

Hopefully we get faster turn rates that 5 rotations per second, otherwise it won't be very precise.
</blockquote>



[[http://www.arduino.cc/playground/Code/LCD|Arduino LCD Code notes]]

[[http://www.arduino.cc/playground/Code/GLCDks0108|Arduino Graphics LCD notes]]

[[http://www.electrokit.se/index.php|Nano sales in sweden]]

===== LCD Links, in order of viability =====

http://www.seetron.com 

http://store.seetron.com/bpp420l-4x20-serial-lcd-with-led-bac420420.html

http://www.seetron.com/bpp440_1.htm  - $140

http://www.seetron.com/bpp420_1.htm  - not black on white, $59, $12 bezel kit - large numbers with punctuation

http://www.seetron.com/pdf/bpp423.pdf

->  http://www.matrixorbital.com/lk20425gw-p-11.html  - blue on white, $89 for extended temp (-20C - +70C) and 9-15v range, large numbers - could be good.  manual here: http://www.matrixorbital.ca/manuals/LK_series/LK204-25/LK204-25.pdf

http://www.matrixorbital.com/lcd-character-lcds-c-1_2.html

http://www.matrixorbital.com/lcd2041gw-p-71.html  - black on white, $69, includes large numbers

http://www.matrixorbital.ca/manuals/LK_series/LK204-25/view?searchterm=None

http://moderndevice.com/LCD.shtml

More expensive, but viable: http://www.crystalfontz.com/products/index-ser.html

Some decent info:
http://reefprojects.com/wiki/Main_Page

Sparkfun has some interesting displays, this one isn't serial, but nice looking and cheap:
http://www.sparkfun.com/commerce/product_info.php?products_id=710
..., etc.

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