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After pulling my hair out for two days, I rewrote the satellite tracking to use the P13 library from Mark VandeWettering
\^ command to activate and deactive satellite tracking
\~ command to view satellite tracking status
109 lines
4.8 KiB
Plaintext
Executable File
109 lines
4.8 KiB
Plaintext
Executable File
_ The Arduino n' Gameduino
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__ _ _ _ __ _ __| |_ Satellite Tracker
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/ _` | ' \/ _` (_-< _|
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\__,_|_||_\__, /__/\__| Written by Mark VandeWettering, K6HX, 2011
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|___/ brainwagon@gmail.com
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Angst is an application that I wrote for the Arduino and Gameduino. It
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is being distributed under the so-called "2-class BSD License", which I
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think grants potential users the greatest possible freedom to integrate
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this code into their own projects. I would, however, consider it a great
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courtesy if you could email me and tell me about your project and how
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this code was used, just for my own continued personal gratification.
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Angst includes P13, a port of the Plan 13 algorithm, originally written
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by James Miller, G3RUH and documented here:
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http://www.amsat.org/amsat/articles/g3ruh/111.html
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Other implementations exist, even for embedded platforms, such as
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the qrpTracker library of Bruce Robertson, VE9QRP and G6LVB's PIC
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implementation that is part of his embedded satellite tracker. My own
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code was ported from a quick and dirty Python implementation of my own,
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and retains a bit of the object orientation that I imposed in that code.
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While the P13 library is reasonably independent and can be used in
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other applications, the remainder of the code is fairly specific to the
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particular hardware I had on hand:
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1. The Gameduino
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James Bowman developed the Gameduino as an Arduino shield to
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generate sound and graphics which might have been typical of
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8 bit computers of the 1980s. It consists of a Xilinx FPGA,
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programmed with a version of his J1 Forth processor, and
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generates video and sound. It is programmed from the Arduino
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using a simple set of commands sent over the I2C bus.
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You can find more information here:
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http://excamera.com/sphinx/gameduino/
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2. A DS1307 RTC
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Sparkfun has a Dallas Semiconductor DS1307 chip mounted on a
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handly little breakout board. I used this chip to keep track
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of time. It's not particularly great: it drifts by a couple
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of minutes a week in my prototype: a better and more accurate
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timepiece would enhance the usability of this prototype. I've
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considered using a GPS to keep track of time, that extension is
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left as an exercise for the motivated reader.
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3. An AT24C1024 Serial EEPROM
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The ATMEGA328 used in the Arduino contains a mere 512 bytes of
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EEPROM. This is enough space to store a few satellites, but I
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wanted to have greater capacitity. So, I got some 128K byte
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EEPROMS for about $4 from digikey. Each one of these can store
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the data for about 750 satellites. My prototype just uses one,
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but it's possible to chain up to four of them together.
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4. A Rotary Encoder
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The entire interface is driven from a single rotary encoder w/
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a built in switch, similar to this one:
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http://www.sparkfun.com/products/9117
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The code turns on the necessary internal pullup resistors to
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allow it to be directly wired to the Arduino input pins.
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Currently the encoder is read in the polling main event loop.
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This means that quick motion of the encoder is not adequately
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tracked: consider this another exercise for the motivated
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reader.
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I hope you enjoy the code, and find it useful and/or informative!
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Copyright 2011, Mark VandeWettering. All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are
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met:
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1. Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer
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in the documentation and/or other materials provided with the
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distribution.
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THIS SOFTWARE IS PROVIDED BY MARK VANDEWETTERING ''AS IS'' AND ANY
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EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> OR
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CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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The views and conclusions contained in the software and documentation
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are those of the authors and should not be interpreted as representing
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official policies, either expressed or implied, of Mark VandeWettering
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