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| author | Bdale Garbee <bdale@gag.com> | 2014-01-22 21:27:17 -0700 |
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| committer | Bdale Garbee <bdale@gag.com> | 2014-01-22 21:27:17 -0700 |
| commit | 3eae72cca7d33bf13d310e477241bc96e578375d (patch) | |
| tree | ebb0f3df717f33a4d1f8a9cc1f8477d0894f0004 /AltOS/doc/micropeak.html | |
| parent | d588a8f98dc0f91c698dfb2d578ffb9cfe553e1f (diff) | |
update docs
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| -rw-r--r-- | AltOS/doc/micropeak.html | 34 |
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diff --git a/AltOS/doc/micropeak.html b/AltOS/doc/micropeak.html index 2f6afb7..28be810 100644 --- a/AltOS/doc/micropeak.html +++ b/AltOS/doc/micropeak.html @@ -1,4 +1,4 @@ -<html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>MicroPeak Owner's Manual</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="book"><div class="titlepage"><div><div><h1 class="title"><a name="idm6245264"></a>MicroPeak Owner's Manual</h1></div><div><h2 class="subtitle">A recording altimeter for hobby rocketry</h2></div><div><div class="author"><h3 class="author"><span class="firstname">Keith</span> <span class="surname">Packard</span></h3></div></div><div><p class="copyright">Copyright © 2012 Bdale Garbee and Keith Packard</p></div><div><div class="legalnotice"><a name="idp48058064"></a><p> +<html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>MicroPeak Owner's Manual</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="book"><div class="titlepage"><div><div><h1 class="title"><a name="idm3476640"></a>MicroPeak Owner's Manual</h1></div><div><h2 class="subtitle">A recording altimeter for hobby rocketry</h2></div><div><div class="author"><h3 class="author"><span class="firstname">Keith</span> <span class="surname">Packard</span></h3></div></div><div><p class="copyright">Copyright © 2012 Bdale Garbee and Keith Packard</p></div><div><div class="legalnotice"><a name="idp48484960"></a><p> This document is released under the terms of the <a class="ulink" href="http://creativecommons.org/licenses/by-sa/3.0/" target="_top"> Creative Commons ShareAlike 3.0 @@ -14,7 +14,7 @@ Add documentation for the MicroPeak USB adapter board. Note the switch to a Kalman filter for peak altitude determination. - </td></tr></table></div></div></div><hr></div><div class="dedication"><div class="titlepage"><div><div><h1 class="title"><a name="idp47885280"></a>Acknowledgements</h1></div></div></div><p> + </td></tr></table></div></div></div><hr></div><div class="dedication"><div class="titlepage"><div><div><h1 class="title"><a name="idp48368352"></a>Acknowledgements</h1></div></div></div><p> Thanks to John Lyngdal for suggesting that we build something like this. </p><p> Have fun using these products, and we hope to meet all of you @@ -26,7 +26,7 @@ NAR #87103, TRA #12201<br> Keith Packard, KD7SQG<br> NAR #88757, TRA #12200<br> </p></div><p> - </p></div><div class="toc"><p><b>Table of Contents</b></p><dl class="toc"><dt><span class="chapter"><a href="#idp48960176">1. Quick Start Guide</a></span></dt><dt><span class="chapter"><a href="#idp48969664">2. Handling Precautions</a></span></dt><dt><span class="chapter"><a href="#idp53493376">3. The MicroPeak USB adapter</a></span></dt><dd><dl><dt><span class="section"><a href="#idp53494704">1. Installing the MicroPeak software</a></span></dt><dt><span class="section"><a href="#idp53497792">2. Downloading Micro Peak data</a></span></dt><dt><span class="section"><a href="#idp53503952">3. Analyzing MicroPeak Data</a></span></dt><dt><span class="section"><a href="#idp47886320">4. Configuring the MicroPeak application</a></span></dt></dl></dd><dt><span class="chapter"><a href="#idp47894112">4. Technical Information</a></span></dt><dd><dl><dt><span class="section"><a href="#idp47894784">1. Barometric Sensor</a></span></dt><dt><span class="section"><a href="#idp47897392">2. Micro-controller</a></span></dt><dt><span class="section"><a href="#idp47899744">3. Lithium Battery</a></span></dt><dt><span class="section"><a href="#idp47902528">4. Atmospheric Model</a></span></dt><dt><span class="section"><a href="#idp47904928">5. Mechanical Considerations</a></span></dt><dt><span class="section"><a href="#idp47907680">6. On-board data storage</a></span></dt><dt><span class="section"><a href="#idp54636384">7. MicroPeak Programming Interface</a></span></dt></dl></dd></dl></div><div class="list-of-tables"><p><b>List of Tables</b></p><dl><dt>4.1. <a href="#idp47909744">MicroPeak EEPROM Data Storage</a></dt></dl></div><div class="chapter"><div class="titlepage"><div><div><h1 class="title"><a name="idp48960176"></a>Chapter 1. Quick Start Guide</h1></div></div></div><p> + </p></div><div class="toc"><p><b>Table of Contents</b></p><dl class="toc"><dt><span class="chapter"><a href="#idp49397120">1. Quick Start Guide</a></span></dt><dt><span class="chapter"><a href="#idp49406608">2. Handling Precautions</a></span></dt><dt><span class="chapter"><a href="#idp48534496">3. The MicroPeak USB adapter</a></span></dt><dd><dl><dt><span class="section"><a href="#idp48535824">1. Installing the MicroPeak software</a></span></dt><dt><span class="section"><a href="#idp48538880">2. Downloading Micro Peak data</a></span></dt><dt><span class="section"><a href="#idp48544992">3. Analyzing MicroPeak Data</a></span></dt><dt><span class="section"><a href="#idp48550624">4. Configuring the MicroPeak application</a></span></dt></dl></dd><dt><span class="chapter"><a href="#idp48377088">4. Technical Information</a></span></dt><dd><dl><dt><span class="section"><a href="#idp48377760">1. Barometric Sensor</a></span></dt><dt><span class="section"><a href="#idp48380368">2. Micro-controller</a></span></dt><dt><span class="section"><a href="#idp48382720">3. Lithium Battery</a></span></dt><dt><span class="section"><a href="#idp48385504">4. Atmospheric Model</a></span></dt><dt><span class="section"><a href="#idp48387904">5. Mechanical Considerations</a></span></dt><dt><span class="section"><a href="#idp48390656">6. On-board data storage</a></span></dt><dt><span class="section"><a href="#idp55072352">7. MicroPeak Programming Interface</a></span></dt></dl></dd></dl></div><div class="list-of-tables"><p><b>List of Tables</b></p><dl><dt>4.1. <a href="#idp48392720">MicroPeak EEPROM Data Storage</a></dt></dl></div><div class="chapter"><div class="titlepage"><div><div><h1 class="title"><a name="idp49397120"></a>Chapter 1. Quick Start Guide</h1></div></div></div><p> MicroPeak is designed to be easy to use. Requiring no external components, flying takes just a few steps </p><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p> @@ -77,7 +77,7 @@ NAR #88757, TRA #12200<br> Recover the data. Turn MicroPeak off and then back on. MicroPeak will blink out the maximum height for the last flight. Turn MicroPeak back off to conserve battery power. - </p></li></ul></div></div><div class="chapter"><div class="titlepage"><div><div><h1 class="title"><a name="idp48969664"></a>Chapter 2. Handling Precautions</h1></div></div></div><p> + </p></li></ul></div></div><div class="chapter"><div class="titlepage"><div><div><h1 class="title"><a name="idp49406608"></a>Chapter 2. Handling Precautions</h1></div></div></div><p> All Altus Metrum products are sophisticated electronic devices. When handled gently and properly installed in an air-frame, they will deliver impressive results. However, as with all electronic @@ -107,12 +107,12 @@ NAR #88757, TRA #12200<br> As with all other rocketry electronics, Altus Metrum altimeters must be protected from exposure to corrosive motor exhaust and ejection charge gasses. - </p></div><div class="chapter"><div class="titlepage"><div><div><h1 class="title"><a name="idp53493376"></a>Chapter 3. The MicroPeak USB adapter</h1></div></div></div><div class="toc"><p><b>Table of Contents</b></p><dl class="toc"><dt><span class="section"><a href="#idp53494704">1. Installing the MicroPeak software</a></span></dt><dt><span class="section"><a href="#idp53497792">2. Downloading Micro Peak data</a></span></dt><dt><span class="section"><a href="#idp53503952">3. Analyzing MicroPeak Data</a></span></dt><dt><span class="section"><a href="#idp47886320">4. Configuring the MicroPeak application</a></span></dt></dl></div><p> + </p></div><div class="chapter"><div class="titlepage"><div><div><h1 class="title"><a name="idp48534496"></a>Chapter 3. The MicroPeak USB adapter</h1></div></div></div><div class="toc"><p><b>Table of Contents</b></p><dl class="toc"><dt><span class="section"><a href="#idp48535824">1. Installing the MicroPeak software</a></span></dt><dt><span class="section"><a href="#idp48538880">2. Downloading Micro Peak data</a></span></dt><dt><span class="section"><a href="#idp48544992">3. Analyzing MicroPeak Data</a></span></dt><dt><span class="section"><a href="#idp48550624">4. Configuring the MicroPeak application</a></span></dt></dl></div><p> MicroPeak stores barometric pressure information for the first 48 seconds of the flight in on-board non-volatile memory. The contents of this memory can be downloaded to a computer using the MicroPeak USB adapter. - </p><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="idp53494704"></a>1. Installing the MicroPeak software</h2></div></div></div><p> + </p><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="idp48535824"></a>1. Installing the MicroPeak software</h2></div></div></div><p> The MicroPeak application runs on Linux, Mac OS X and Windows. You can download the latest version from <a class="ulink" href="http://altusmetrum.org/AltOS" target="_top">http://altusmetrum.org/AltOS</a>. @@ -121,7 +121,7 @@ NAR #88757, TRA #12200<br> be installed. A compatible version of this driver is included with the MicroPeak application, but you may want to download a newer version from <a class="ulink" href="http://www.ftdichip.com/FTDrivers.htm" target="_top">http://www.ftdichip.com/FTDrivers.htm</a>. - </p></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="idp53497792"></a>2. Downloading Micro Peak data</h2></div></div></div><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p> + </p></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="idp48538880"></a>2. Downloading Micro Peak data</h2></div></div></div><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p> Connect the MicroPeak USB adapter to a USB cable and plug it in to your computer. </p></li><li class="listitem"><p> @@ -147,7 +147,7 @@ NAR #88757, TRA #12200<br> it will present the data in a graph and offer to save the data to a file. If not, you can power cycle the MicroPeak board and try again. - </p></li></ul></div></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="idp53503952"></a>3. Analyzing MicroPeak Data</h2></div></div></div><p> + </p></li></ul></div></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="idp48544992"></a>3. Analyzing MicroPeak Data</h2></div></div></div><p> The MicroPeak application can present flight data in the form of a graph, a collection of computed statistics or in tabular form. @@ -190,7 +190,7 @@ NAR #88757, TRA #12200<br> Data tab) to a file, change the application Preferences, Close the current window or close all windows and Exit the application. - </p></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="idp47886320"></a>4. Configuring the MicroPeak application</h2></div></div></div><p> + </p></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="idp48550624"></a>4. Configuring the MicroPeak application</h2></div></div></div><p> The MicroPeak application has a few user settings which are configured through the Preferences dialog, which can be accessed from the File menu. @@ -224,7 +224,7 @@ NAR #88757, TRA #12200<br> Note that MicroPeak shares a subset of the AltosUI preferences, so if you use both of these applications, change in one application will affect the other. - </p></div></div><div class="chapter"><div class="titlepage"><div><div><h1 class="title"><a name="idp47894112"></a>Chapter 4. Technical Information</h1></div></div></div><div class="toc"><p><b>Table of Contents</b></p><dl class="toc"><dt><span class="section"><a href="#idp47894784">1. Barometric Sensor</a></span></dt><dt><span class="section"><a href="#idp47897392">2. Micro-controller</a></span></dt><dt><span class="section"><a href="#idp47899744">3. Lithium Battery</a></span></dt><dt><span class="section"><a href="#idp47902528">4. Atmospheric Model</a></span></dt><dt><span class="section"><a href="#idp47904928">5. Mechanical Considerations</a></span></dt><dt><span class="section"><a href="#idp47907680">6. On-board data storage</a></span></dt><dt><span class="section"><a href="#idp54636384">7. MicroPeak Programming Interface</a></span></dt></dl></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="idp47894784"></a>1. Barometric Sensor</h2></div></div></div><p> + </p></div></div><div class="chapter"><div class="titlepage"><div><div><h1 class="title"><a name="idp48377088"></a>Chapter 4. Technical Information</h1></div></div></div><div class="toc"><p><b>Table of Contents</b></p><dl class="toc"><dt><span class="section"><a href="#idp48377760">1. Barometric Sensor</a></span></dt><dt><span class="section"><a href="#idp48380368">2. Micro-controller</a></span></dt><dt><span class="section"><a href="#idp48382720">3. Lithium Battery</a></span></dt><dt><span class="section"><a href="#idp48385504">4. Atmospheric Model</a></span></dt><dt><span class="section"><a href="#idp48387904">5. Mechanical Considerations</a></span></dt><dt><span class="section"><a href="#idp48390656">6. On-board data storage</a></span></dt><dt><span class="section"><a href="#idp55072352">7. MicroPeak Programming Interface</a></span></dt></dl></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="idp48377760"></a>1. Barometric Sensor</h2></div></div></div><p> MicroPeak uses the Measurement Specialties MS5607 sensor. This has a range of 120kPa to 1kPa with an absolute accuracy of 150Pa and a resolution of 2.4Pa. @@ -238,7 +238,7 @@ NAR #88757, TRA #12200<br> taken while the altimeter is at rest. Flight pressure is computed from a Kalman filter designed to smooth out any minor noise in the sensor values. - </p></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="idp47897392"></a>2. Micro-controller</h2></div></div></div><p> + </p></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="idp48380368"></a>2. Micro-controller</h2></div></div></div><p> MicroPeak uses an Atmel ATtiny85 micro-controller. This tiny CPU contains 8kB of flash for the application, 512B of RAM for temporary data storage and 512B of EEPROM for non-volatile @@ -249,7 +249,7 @@ NAR #88757, TRA #12200<br> this mode, the chip consumes only .1μA of power. MicroPeak uses this mode once the flight has ended to preserve battery power. - </p></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="idp47899744"></a>3. Lithium Battery</h2></div></div></div><p> + </p></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="idp48382720"></a>3. Lithium Battery</h2></div></div></div><p> The CR1025 battery used by MicroPeak holds 30mAh of power, which is sufficient to run for over 40 hours. Because MicroPeak powers down on landing, run time includes only time @@ -266,7 +266,7 @@ NAR #88757, TRA #12200<br> battery with MicroPeak. If so, many stores carry CR1025 batteries as they are commonly used in small electronic devices such as flash lights. - </p></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="idp47902528"></a>4. Atmospheric Model</h2></div></div></div><p> + </p></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="idp48385504"></a>4. Atmospheric Model</h2></div></div></div><p> MicroPeak contains a fixed atmospheric model which is used to convert barometric pressure into altitude. The model was converted into a 469-element piece wise linear approximation @@ -282,7 +282,7 @@ NAR #88757, TRA #12200<br> altitude is subtracted from the computed apogee altitude, so the resulting height is more accurate than either the ground or apogee altitudes. - </p></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="idp47904928"></a>5. Mechanical Considerations</h2></div></div></div><p> + </p></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="idp48387904"></a>5. Mechanical Considerations</h2></div></div></div><p> MicroPeak is designed to be rugged enough for typical rocketry applications. It contains two moving parts, the battery holder and the power switch, which were selected for their @@ -298,7 +298,7 @@ NAR #88757, TRA #12200<br> any direction. Because it is a sliding switch, orienting the switch perpendicular to the direction of rocket travel will serve to further protect the switch from launch forces. - </p></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="idp47907680"></a>6. On-board data storage</h2></div></div></div><p> + </p></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="idp48390656"></a>6. On-board data storage</h2></div></div></div><p> The ATtiny85 has 512 bytes of non-volatile storage, separate from the code storage memory. The MicroPeak firmware uses this to store information about the last completed @@ -311,7 +311,7 @@ NAR #88757, TRA #12200<br> at regular intervals during the flight. This information can be extracted from MicroPeak through any AVR programming tool. - </p><div class="table"><a name="idp47909744"></a><p class="title"><b>Table 4.1. MicroPeak EEPROM Data Storage</b></p><div class="table-contents"><table summary="MicroPeak EEPROM Data Storage" border="1"><colgroup><col align="center" class="Address"><col align="center" class="Size (bytes)"><col align="left" class="Description"></colgroup><thead><tr><th align="center">Address</th><th align="center">Size (bytes)</th><th align="center">Description</th></tr></thead><tbody><tr><td align="center">0x000</td><td align="center">4</td><td align="left">Average ground pressure (Pa)</td></tr><tr><td align="center">0x004</td><td align="center">4</td><td align="left">Minimum flight pressure (Pa)</td></tr><tr><td align="center">0x008</td><td align="center">2</td><td align="left">Number of in-flight samples</td></tr><tr><td align="center">0x00a … 0x1fe</td><td align="center">2</td><td align="left">Instantaneous flight pressure (Pa) low 16 bits</td></tr></tbody></table></div></div><br class="table-break"><p> + </p><div class="table"><a name="idp48392720"></a><p class="title"><b>Table 4.1. MicroPeak EEPROM Data Storage</b></p><div class="table-contents"><table summary="MicroPeak EEPROM Data Storage" border="1"><colgroup><col align="center" class="Address"><col align="center" class="Size (bytes)"><col align="left" class="Description"></colgroup><thead><tr><th align="center">Address</th><th align="center">Size (bytes)</th><th align="center">Description</th></tr></thead><tbody><tr><td align="center">0x000</td><td align="center">4</td><td align="left">Average ground pressure (Pa)</td></tr><tr><td align="center">0x004</td><td align="center">4</td><td align="left">Minimum flight pressure (Pa)</td></tr><tr><td align="center">0x008</td><td align="center">2</td><td align="left">Number of in-flight samples</td></tr><tr><td align="center">0x00a … 0x1fe</td><td align="center">2</td><td align="left">Instantaneous flight pressure (Pa) low 16 bits</td></tr></tbody></table></div></div><br class="table-break"><p> All EEPROM data are stored least-significant byte first. The instantaneous flight pressure data are stored without the upper 16 bits of data. The upper bits can be reconstructed @@ -331,7 +331,7 @@ NAR #88757, TRA #12200<br> 25°C. So, you can count on the pressure data being accurate, but speed or acceleration data computed from this will be limited by the accuracy of this clock. - </p></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="idp54636384"></a>7. MicroPeak Programming Interface</h2></div></div></div><p> + </p></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="idp55072352"></a>7. MicroPeak Programming Interface</h2></div></div></div><p> MicroPeak exposes a standard 6-pin AVR programming interface, but not using the usual 2x3 array of pins on 0.1" centers. Instead, there is a single row of tiny 0.60mm × |