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Signed-off-by: Keith Packard <keithp@keithp.com>

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-<?xml version="1.0" encoding="utf-8" ?>
-<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
-  "/usr/share/xml/docbook/schema/dtd/4.5/docbookx.dtd">
-<book>
-  <title>MicroPeak Owner's Manual</title>
-  <subtitle>A recording altimeter for hobby rocketry</subtitle>
-  <bookinfo>
-    <author>
-      <firstname>Keith</firstname>
-      <surname>Packard</surname>
-    </author>
-    <copyright>
-      <year>2014</year>
-      <holder>Bdale Garbee and Keith Packard</holder>
-    </copyright>
-    <mediaobject>
-      <imageobject>
-	<imagedata fileref="micropeak-dime.jpg" width="6in"/>
-      </imageobject>
-    </mediaobject>
-    <legalnotice>
-      <para>
-        This document is released under the terms of the
-        <ulink url="http://creativecommons.org/licenses/by-sa/3.0/">
-          Creative Commons ShareAlike 3.0
-        </ulink>
-        license.
-      </para>
-    </legalnotice>
-    <revhistory>
-      <revision>
-	<revnumber>0.1</revnumber>
-	<date>29 October 2012</date>
-	<revremark>
-	  Initial release with preliminary hardware.
-	</revremark>
-      </revision>
-      <revision>
-	<revnumber>1.0</revnumber>
-	<date>18 November 2012</date>
-	<revremark>
-	  Updates for version 1.0 release.
-	</revremark>
-      </revision>
-      <revision>
-	<revnumber>1.1</revnumber>
-	<date>12 December 2012</date>
-	<revremark>
-	  Add comments about EEPROM storage format and programming jig.
-	</revremark>
-      </revision>
-      <revision>
-	<revnumber>1.2</revnumber>
-	<date>20 January 2013</date>
-	<revremark>
-	  Add documentation for the MicroPeak USB adapter board. Note
-	  the switch to a Kalman filter for peak altitude
-	  determination.
-	</revremark>
-      </revision>
-      <revision>
-	<revnumber>1.3.2</revnumber>
-	<date>12 February 2014</date>
-	<revremark>
-	  Add a "Download" button to the main window, which makes it
-	  quicker to access the download function. Update the data
-	  download documentation to reflect the new MicroPeak USB
-	  adapter design. Monitor data during download to let you see
-	  if the USB connection is working at all by showing the
-	  characters received from the MicroPeak USB adapter.
-	</revremark>
-      </revision>
-    </revhistory>
-  </bookinfo>
-  <dedication>
-    <title>Acknowledgements</title>
-    <para>
-      Thanks to John Lyngdal for suggesting that we build something like this.
-    </para>
-    <para>
-      Have fun using these products, and we hope to meet all of you
-      out on the rocket flight line somewhere.
-      <literallayout>
-Bdale Garbee, KB0G
-NAR #87103, TRA #12201
-
-Keith Packard, KD7SQG
-NAR #88757, TRA #12200
-      </literallayout>
-    </para>
-  </dedication>
-  <chapter>
-    <title>Quick Start Guide</title>
-    <para>
-      MicroPeak is designed to be easy to use. Requiring no external
-      components, flying takes just a few steps
-    </para>
-    <itemizedlist>
-      <listitem>
-	<para>
-	  Install the battery. Fit a CR1025 battery into the plastic
-	  carrier. The positive (+) terminal should be towards the more
-	  open side of the carrier. Slip the carrier into the battery
-	  holder with the positive (+) terminal facing away from the
-	  circuit board.
-	</para>
-	<informalfigure>
-	  <mediaobject>
-	    <imageobject>
-	      <imagedata fileref="micropeak-back.jpg" width="4.5in"/>
-	    </imageobject>
-	  </mediaobject>
-	</informalfigure>
-      </listitem>
-      <listitem>
-	<para>
-	  Install MicroPeak in your rocket. This can be as simple as
-	  preparing a soft cushion of wadding inside a vented model payload
-	  bay. Wherever you mount it, make sure you protect the
-	  barometric sensor from corrosive ejection gasses as those
-	  will damage the sensor, and shield it from light as that can
-	  cause incorrect sensor readings.
-	</para>
-      </listitem>
-      <listitem>
-	<para>
-	  Turn MicroPeak on. Slide the switch so that the actuator
-	  covers the '1' printed on the board. MicroPeak will report
-	  the maximum height of the last flight in decimeters using a
-	  sequence of flashes on the LED. A sequence of short flashes
-	  indicates one digit. A single long flash indicates zero. The
-	  height is reported in decimeters, so the last digit will be
-	  tenths of a meter. For example, if MicroPeak reports 5 4 4
-	  3, then the maximum height of the last flight was 544.3m, or
-	  1786 feet.
-	</para>
-      </listitem>
-      <listitem>
-	<para>
-	  Finish preparing the rocket for flight. After the
-	  previous flight data have been reported, MicroPeak waits for
-	  one minute before starting to check for launch. This gives
-	  you time to finish assembling the rocket. As those
-	  activities might cause pressure changes inside the airframe,
-	  MicroPeak might accidentally detect boost. If you need to do
-	  anything to the airframe after the one minute window passes,
-	  make sure to be careful not to disturb the altimeter. The
-	  LED will remain dark during the one minute delay, but after
-	  that, it will start blinking once every 3 seconds.
-	</para>
-      </listitem>
-      <listitem>
-	<para>
-	  Fly the rocket. Once the rocket passes about 30m in height
-	  (100 feet), the micro-controller will record the ground
-	  pressure and track the pressure seen during the flight. In
-	  this mode, the LED flickers rapidly. When the rocket lands,
-	  and the pressure stabilizes, the micro-controller will record
-	  the minimum pressure pressure experienced during the flight,
-	  compute the height represented by the difference in air
-	  pressure and blink that value out on the LED. After that,
-	  MicroPeak powers down to conserve battery power.
-	</para>
-      </listitem>
-      <listitem>
-	<para>
-	  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.
-	</para>
-      </listitem>
-    </itemizedlist>
-  </chapter>
-  <chapter>
-    <title>Handling Precautions</title>
-    <para>
-      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 
-      devices, there are some precautions you must take.
-    </para>
-    <para>
-      The CR1025 Lithium batteries have an
-      extraordinary power density.  This is great because we can fly with
-      much less battery mass... but if they are punctured
-      or their contacts are allowed to short, they can and will release their
-      energy very rapidly!
-      Thus we recommend that you take some care when handling MicroPeak
-      to keep conductive material from coming in contact with the exposed metal elements.
-    </para>
-    <para>
-      The barometric sensor used in MicroPeak is sensitive to
-      sunlight. Please consider this when designing an
-      installation. Many model rockets with payload bays use clear
-      plastic for the payload bay. Replacing these with an opaque
-      cardboard tube, painting them, or wrapping them with a layer of
-      masking tape are all reasonable approaches to keep the sensor
-      out of direct sunlight.
-    </para>
-    <para>
-      The barometric sensor sampling ports must be able to "breathe",
-      both by not being covered by foam or tape or other materials that might
-      directly block the hole on the top of the sensor, and also by having a
-      suitable static vent to outside air.
-    </para>
-    <para>
-      As with all other rocketry electronics, Altus Metrum altimeters must 
-      be protected from exposure to corrosive motor exhaust and ejection 
-      charge gasses.
-    </para>
-  </chapter>
-  <chapter>
-    <title>The MicroPeak USB adapter</title>
-    <informalfigure>
-      <mediaobject>
-	<imageobject>
-	  <imagedata fileref="MicroPeakUSB-2.0.jpg" width="4.5in"/>
-	</imageobject>
-      </mediaobject>
-    </informalfigure>
-    <para>
-      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.
-    </para>
-    <section>
-      <title>Installing the MicroPeak software</title>
-      <para>
-	The MicroPeak application runs on Linux, Mac OS X and
-	Windows. You can download the latest version from
-	<ulink url="http://altusmetrum.org/AltOS"/>.
-      </para>
-      <para>
-	On Mac OS X and Windows, the FTDI USB device driver needs to
-	be installed. A compatible version of this driver is included
-	with the MicroPeak application, but you may want to download a
-	newer version from <ulink
-	url="http://www.ftdichip.com/FTDrivers.htm"/>.
-      </para>
-    </section>
-    <section>
-      <title>Downloading Micro Peak data</title>
-      <itemizedlist>
-	<listitem>
-	  <para>
-	    Plug the MicroPeak USB adapter in to your computer.
-	  </para>
-	</listitem>
-	<listitem>
-	  <?dbfo keep-together="always"?>
-	  <para>
-	    Start the MicroPeak application.
-	  </para>
-	  <informalfigure>
-	    <mediaobject>
-	      <imageobject>
-		<imagedata fileref="micropeak-nofont.svg" width="0.5in"/>
-	      </imageobject>
-	    </mediaobject>
-	  </informalfigure>
-	</listitem>
-	<listitem>
-	  <?dbfo keep-together="always"?>
-	  <para>
-	     Click on the Download button at the top of the window.
-	  </para>
-	  <informalfigure>
-	    <mediaobject>
-	      <imageobject>
-		<imagedata fileref="micropeak-app.png" width="4.5in"/>
-	      </imageobject>
-	    </mediaobject>
-	  </informalfigure>
-	</listitem>
-	<listitem>
-	  <?dbfo keep-together="always"?>
-	  <para>
-	    Select from the listed devices. There will probably be
-	    only one.
-	  </para>
-	  <informalfigure>
-	    <mediaobject>
-	      <imageobject>
-		<imagedata fileref="micropeak-device-dialog.png" width="2.3in"/>
-	      </imageobject>
-	    </mediaobject>
-	  </informalfigure>
-	</listitem>
-	<listitem>
-	  <para>
-	    The application will now wait until it receives valid data
-	    from the MicroPeak USB adapter.
-	  </para>
-	  <informalfigure>
-	    <mediaobject>
-	      <imageobject>
-		<imagedata fileref="micropeak-download.png" width="2in"/>
-	      </imageobject>
-	    </mediaobject>
-	  </informalfigure>
-	  <para>
-	    The MicroPeak USB adapter has a small phototransistor
-	    under the hole in the center of the box.
-	    Locate this, turn on the MicroPeak and place the orange LED on the MicroPeak
-	    directly inside the hole, resting the MicroPeak itself on
-	    the box. You should see the blue LED on the MicroPeak USB
-	    adapter blinking in time with the orange LED on the
-	    MicroPeak board itself.
-	  </para>
-	  <informalfigure>
-	    <mediaobject>
-	      <imageobject>
-		<imagedata fileref="MicroPeakUSB-2.0-inuse.jpg" width="4.5in"/>
-	      </imageobject>
-	    </mediaobject>
-	  </informalfigure>
-	</listitem>
-	<listitem>
-	  <?dbfo keep-together="always"?>
-	  <para>
-	    After the maximum flight height is reported, MicroPeak will
-	    pause for a few seconds, blink the LED four times rapidly
-	    and then send the data in one long blur on the LED. The
-	    MicroPeak application should receive the data. When it does,
-	    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.
-	  </para>
-	  <informalfigure>
-	    <mediaobject>
-	      <imageobject>
-		<imagedata fileref="micropeak-save-dialog.png" width="2.3in"/>
-	      </imageobject>
-	    </mediaobject>
-	  </informalfigure>
-	</listitem>
-	<listitem>
-	  <?dbfo keep-together="always"?>
-	  <para>
-	    Once the data are saved, a graph will be displayed with
-	    height, speed and acceleration values computed from the
-	    recorded barometric pressure data. See the next section
-	    for more details on that.
-	  </para>
-	</listitem>
-      </itemizedlist>
-    </section>
-    <section>
-      <title>Analyzing MicroPeak Data</title>
-      <para>
-	The MicroPeak application can present flight data in the form
-	of a graph, a collection of computed statistics or in tabular
-	form.
-      </para>
-      <para>
-	MicroPeak collects raw barometric pressure data which is
-	then used to compute the remaining data. Altitude is computed
-	through a standard atmospheric model. Absolute error in this
-	data will be affected by local atmospheric
-	conditions. Fortunately, these errors tend to mostly cancel
-	out, so the error in the height computation is much smaller
-	than the error in altitude would be.
-      </para>
-      <para>
-	Speed and acceleration are computed by first smoothing the
-	height data with a Gaussian window averaging filter. For speed
-	data, this average uses seven samples. For acceleration data,
-	eleven samples are used. These were chosen to provide
-	reasonably smooth speed and acceleration data, which would
-	otherwise be swamped with noise.
-      </para>
-      <para>
-	The File menu has operations to open existing flight logs,
-	Download new data from MicroPeak, Save a copy of the flight
-	log to a new file, Export the tabular data (as seen in the Raw
-	Data tab) to a file, change the application Preferences, Close
-	the current window or close all windows and Exit the
-	application.
-      </para>
-      <section>
-	<title>MicroPeak Graphs</title>
-	<para>
-	  Under the Graph tab, the height, speed and acceleration values
-	  are displayed together. You can zoom in on the graph by
-	  clicking and dragging to sweep out an area of
-	  interest. Right-click on the plot to bring up a menu that will
-	  let you save, copy or print the graph.
-	</para>
-	<informalfigure>
-	  <mediaobject>
-	    <imageobject>
-	      <imagedata fileref="micropeak-graph.png" width="4.5in"/>
-	    </imageobject>
-	  </mediaobject>
-	</informalfigure>
-      </section>
-      <section>
-	<title>MicroPeak Flight Statistics</title>
-	<para>
-	  The Statistics tab presents overall data from the flight. Note
-	  that the Maximum height value is taken from the minumum
-	  pressure captured in flight, and may be different from the
-	  apparant apogee value as the on-board data are sampled twice
-	  as fast as the recorded values, or because the true apogee
-	  occurred after the on-board memory was full. Each value is
-	  presented in several units as appropriate.
-	</para>
-	<informalfigure>
-	  <mediaobject>
-	    <imageobject>
-	      <imagedata fileref="micropeak-statistics.png" width="4.5in"/>
-	    </imageobject>
-	  </mediaobject>
-	</informalfigure>
-      </section>
-      <section>
-	<title>Raw Data</title>
-	<para>
-	  A table consisting of the both the raw barometric pressure
-	  data and values computed from that for each recorded time.
-	</para>
-	<informalfigure>
-	  <mediaobject>
-	    <imageobject>
-	      <imagedata fileref="micropeak-raw-data.png" width="4.5in"/>
-	    </imageobject>
-	  </mediaobject>
-	</informalfigure>
-      </section>
-      <section>
-	<title>Configuring the Graph</title>
-	<para>
-	  This selects which graph elements to show, and lets you
-	  switch between metric and imperial units
-	</para>
-	<informalfigure>
-	  <mediaobject>
-	    <imageobject>
-	      <imagedata fileref="micropeak-graph-configure.png" width="4.5in"/>
-	    </imageobject>
-	  </mediaobject>
-	</informalfigure>
-      </section>
-    </section>
-    <section>
-      <title>Setting MicroPeak Preferences</title>
-      <informalfigure>
-	<mediaobject>
-	  <imageobject>
-	    <imagedata fileref="micropeak-preferences.png" width="1.8in"/>
-	  </imageobject>
-	</mediaobject>
-      </informalfigure>
-      <para>
-	The MicroPeak application has a few user settings which are
-	configured through the Preferences dialog, which can be
-	accessed from the File menu.
-      <itemizedlist>
-	<listitem>
-	  <para>
-	    The Log Directory is where flight data will be saved to
-	    and loaded from by default. Of course, you can always
-	    navigate to other directories in the file chooser windows,
-	    this setting is just the starting point.
-	  </para>
-	</listitem>
-	<listitem>
-	  <para>
-	    If you prefer to see your graph data in feet and
-	    miles per hour instead of meters and meters per second,
-	    you can select Imperial Units.
-	  </para>
-	</listitem>
-	<listitem>
-	  <para>
-	    To see what data is actually arriving over the serial
-	    port, start the MicroPeak application from a command
-	    prompt and select the Serial Debug option. This can be
-	    useful in debugging serial communication problems, but
-	    most people need never choose this.
-	  </para>
-	</listitem>
-	<listitem>
-	  <para>
-	    You can adjust the size of the text in the Statistics tab
-	    by changing the Font size preference. There are three
-	    settings, with luck one will both fit on your screen and
-	    provide readable values.
-	  </para>
-	</listitem>
-	<listitem>
-	  <para>
-	    The Look &amp; feel menu shows a list of available
-	    application appearance choices. By default, the MicroPeak
-	    application tries to blend in with other applications, but
-	    you may choose some other appearance if you like.
-	  </para>
-	</listitem>
-      </itemizedlist>
-      </para>
-      <para>
-	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.
-      </para>
-    </section>
-  </chapter>
-  <chapter>
-    <title>Technical Information</title>
-    <section>
-      <title>Barometric Sensor</title>
-      <para>
-	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.
-      </para>
-      <para>
-	The pressure range corresponds roughly to an altitude range of
-	-1500m (-4900 feet) to 31000m (102000 feet), while the
-	resolution is approximately 20cm (8 inches) near sea level and
-	60cm (24in) at 10000m (33000 feet).
-      </para>
-      <para>
-	Ground pressure is computed from an average of 16 samples,
-	taken while the altimeter is at rest. The flight pressure used to
-	report maximum height is computed from a Kalman filter
-	designed to smooth out any minor noise in the sensor
-	values. The flight pressure recorded to non-volatile storage
-	is unfiltered, coming directly from the pressure sensor.
-      </para>
-    </section>
-    <section>
-      <title>Micro-controller</title>
-      <para>
-	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
-	storage of previous flight data.
-      </para>
-      <para>
-	The ATtiny85 has a low-power mode which turns off all of the
-	clocks and powers down most of the internal components. In
-	this mode, the chip consumes only .1μA of power. MicroPeak
-	uses this mode once the flight has ended to preserve battery
-	power.
-      </para>
-    </section>
-    <section>
-      <title>Lithium Battery</title>
-      <para>
-	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
-	sitting on the launch pad or during flight.
-      </para>
-      <para>
-	The large positive terminal (+) is usually marked, while the
-	smaller negative terminal is not. Make sure you install the
-	battery with the positive terminal facing away from the
-	circuit board where it will be in contact with the metal
-	battery holder. A small pad on the circuit board makes contact
-	with the negative battery terminal.
-      </para>
-      <para>
-	Shipping restrictions may prevent us from including a CR1025
-	battery with MicroPeak. If so, many stores carry CR1025
-	batteries as they are commonly used in small electronic
-	devices such as flash lights.
-      </para>
-    </section>
-    <section>
-      <title>Atmospheric Model</title>
-      <para>
-	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
-	which is then used to compute the altitude of the ground and
-	apogee. The difference between these represents the maximum
-	height of the flight.
-      </para>
-      <para>
-	The model assumes a particular set of atmospheric conditions,
-	which, while a reasonable average, cannot represent the changing
-	nature of the real atmosphere. Fortunately, for flights
-	reasonably close to the ground, the effect of this global
-	inaccuracy are largely canceled out when the computed ground
-	altitude is subtracted from the computed apogee altitude, so
-	the resulting height is more accurate than either the ground
-	or apogee altitudes.
-      </para>
-      <para>
-	Because the raw pressure data is recorded to non-volatile
-	storage, you can use that, along with a more sophisticated
-	atmospheric model, to compute your own altitude values.
-      </para>
-    </section>
-    <section>
-      <title>Mechanical Considerations</title>
-      <para>
-	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
-	ruggedness.
-      </para>
-      <para>
-	The MicroPeak battery holder is designed to withstand impact
-	up to 150g without breaking contact (or, worse yet, causing
-	the battery to fall out). That means it should stand up to
-	almost any launch you care to try, and should withstand fairly
-	rough landings.
-      </para>
-      <para>
-	The power switch is designed to withstand up to 50g forces in
-	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.
-      </para>
-    </section>
-    <section>
-      <title>On-board data storage</title>
-      <para>
-	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
-	flight. Barometric measurements from the ground before launch
-	and at apogee are stored, and used at power-on to compute the
-	height of the last flight.
-      </para>
-      <para>
-	In addition to the data used to present the height of the last
-	flight, MicroPeak also stores barometric information sampled
-	at regular intervals during the flight. This is the
-	information captured with the MicroPeak USB adapter. It can
-	also be read from MicroPeak through any AVR programming
-	tool.
-      </para>
-      <table frame='all'>
-	<title>MicroPeak EEPROM Data Storage</title>
-	<tgroup cols='3' align='center' colsep='1' rowsep='1'>
-	  <colspec align='center' colwidth='2*' colname='Address'/>
-	  <colspec align='center' colwidth='*' colname='Size (bytes)'/>
-	  <colspec align='left' colwidth='7*' colname='Description'/>
-	  <thead>
-	    <row>
-	      <entry align='center'>Address</entry>
-	      <entry align='center'>Size (bytes)</entry>
-	      <entry align='center'>Description</entry>
-	    </row>
-	  </thead>
-	  <tbody>
-	    <row>
-	      <entry>0x000</entry>
-	      <entry>4</entry>
-	      <entry>Average ground pressure (Pa)</entry>
-	    </row>
-	    <row>
-	      <entry>0x004</entry>
-	      <entry>4</entry>
-	      <entry>Minimum flight pressure (Pa)</entry>
-	    </row>
-	    <row>
-	      <entry>0x008</entry>
-	      <entry>2</entry>
-	      <entry>Number of in-flight samples</entry>
-	    </row>
-	    <row>
-	      <entry>0x00a … 0x1fe</entry>
-	      <entry>2</entry>
-	      <entry>Instantaneous flight pressure (Pa) low 16 bits</entry>
-	    </row>
-	  </tbody>
-	</tgroup>
-      </table>
-      <para>
-	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
-	from the previous sample, assuming that pressure doesn't
-	change by more more than 32kPa in a single sample
-	interval. Note that this pressure data is <emphasis>not</emphasis>
-	filtered in any way, while both the recorded ground and apogee
-	pressure values are, so you shouldn't expect the minimum
-	instantaneous pressure value to match the recorded minimum
-	pressure value exactly.
-      </para>
-      <para>
-	MicroPeak samples pressure every 96ms, but stores only every
-	other sample in the EEPROM. This provides for 251 pressure
-	samples at 192ms intervals, or 48.192s of storage. The clock
-	used for these samples is a factory calibrated RC circuit
-	built into the ATtiny85 and is accurate only to within ±10% at
-	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.
-      </para>
-    </section>
-    <section>
-      <title>MicroPeak Programming Interface</title>
-      <para>
-	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 ×
-	0.85mm pads on 1.20mm centers exposed near the edge of the
-	circuit board. We couldn't find any connector that was
-	small enough to include on the circuit board.
-      </para>
-      <para>
-	In lieu of an actual connector, the easiest way to connect to
-	the bare pads is through a set of Pogo pins. These
-	spring-loaded contacts are designed to connect in precisely
-	this way. We've designed a programming jig, the MicroPeak
-	Pogo Pin board which provides a standard AVR interface on one
-	end and a recessed slot for MicroPeak to align the board with
-	the Pogo Pins.
-      </para>
-      <para>
-	The MicroPeak Pogo Pin board is not a complete AVR programmer,
-	it is an interface board that provides a 3.3V regulated power
-	supply to run the MicroPeak via USB and a standard 6-pin AVR
-	programming interface with the usual 2x3 grid of pins on 0.1"
-	centers. This can be connected to any AVR programming
-	dongle.
-      </para>
-      <para>
-	The AVR programming interface cannot run faster than ¼ of the
-	AVR CPU clock frequency. Because MicroPeak runs at 250kHz to
-	save power, you must configure your AVR programming system to
-	clock the AVR programming interface at no faster than
-	62.5kHz, or a clock period of 32µS.
-      </para>
-    </section>
-  </chapter>
-</book>
-<!--  LocalWords:  Altusmetrum MicroPeak
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