clean up confusion between AltusMetrum and OpenAlt naming for original

design based on LPC2148, add a reference to being US based with a flag
image from openclipart.org

6 files changed, 105 insertions, 0 deletions

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+# AltusMetrum
+
+This is the design that started it all!  Bdale got frustrated with existing
+commercial altimeters and decided to build his own.  This project was 
+presented in talks at LCA, SCALE, OLS, and Debconf in 2008.
+
+Here are photos of the front and back sides of the version 0.1 prototype PCB,
+which was 100% auto-routed on 2 layers using the 
+[gEDA](http://www.gpleda.org) 
+schematic and pcb tools.
+
+<a href="hpim2581.jpg"> <img src="hpim2581-thumb.jpg"></a>
+<a href="hpim2582.jpg"> <img src="hpim2582-thumb.jpg"></a>
+
+## Features ##
+
+### User View ###
+
+* Recording altimeter for model rocketry
+* Supports dual deployment (can fire 2 ejection charges)
+* Primary operations based on pressure sensor
+* 3-axis accelerometer
+* Temperature sensor
+* 2 serial ports for attachment of GPS and RF link modules
+* USB for data recovery and post-flight power source
+* Flexible battery choices
+* Designed to fit 24mm airframe tube
+
+### Developer View ###
+
+* NXP LPC-2148 Processor (ARM7TDMI-S)
+	* 512k Flash memory, 32k RAM
+	* USB plus lots of analog, digital, and serial I/O
+* Microchip 24FC1025 CMOS serial EEPROM
+	* 128k x 8
+	* I2C interface
+* Various Sensors
+	* Freescale MP3H6115A pressure sensor
+	* Freescale MMA7260QT 3-axis accelerometer
+	* Microchip MCP9700A temperature sensor
+	* (Honeywell 2-axis magnetic sensor left out of v0.1)
+* Software Features
+	* Written mostly in C with some ARM assembler
+	* Runs from on-chip flash, uses on-chip RAM, stores flight data to
+		serial EEPROM chip
+	* USB serial emulation for "console" interface
+	* Uses GCC, newlib, FreeRTOS, LPCUSB
+	* Based on a demo package written for the Olimex LPC-P2148 eval board
+		by J C Wren
+* Licenses
+	* The hardware is licensed under the [TAPR](http://www.tapr.org) [Open Hardware License](http://www.tapr.org/ohl.html)
+	* The software is licensed [GPL version 2](http://www.gnu.org/licenses/old-licenses/gpl-2.0.html)
+
+## Problems ##
+
+In addition to the various "oopses" that were found and fixed during initial
+turn-on of this board, several issues contributed to the decision to shelve
+the design for now:
+
+* lots of work went in to trying to make the board fit in a 24mm airframe,
+  but the resulting design with battery is really too heavy for such a small
+  rocket.
+
+* the 3-axis accelerometer has a max scale of +/- 6g.  This is insufficient
+  for characterizing the kinds of motors that we're playing with now.
+
+* while using a gcc-based toolchain to cross-develop for the ARM7 core works
+  reasonably well, it's a heavy toolchain to build and maintain, and the
+  processor really is serious overkill for the task at hand.
+
+## Artifacts ##
+
+The best version of Bdale's [Peace Love and Rockets](AltusMetrum.odp) 
+presentation about this hardware generation was given at the Ohio LinuxFest 
+2008.  Note that there are many photos included, so this is a HUGE file!
+
+The version 0.1 design had enough issues that Bdale decided not to publish
+it.  Work on an 0.2 revision is mostly complete at the schematic level, and
+some printed circuit board artwork updates were made, but a second run of
+boards was never attempted.  This design is now mostly of historical interest.
+
+## Futures ##
+
+If we decide to do further work on this design, a number of changes seem
+potentially appropriate for the next board revision, in addition to just
+fixing bugs found in the turn-on of the initial boards.
+
+* The LiPo battery support from [TeleMetrum](../TeleMetrum) should be copied
+  into this design, replacing the battery screw terminals with a standard LiPo
+  2-pin battery connector.
+
+* The [SparkFun](http://www.sparkfun.com) folks have produced 
+  a [USB bootloader for the LPC2148](http://www.sparkfun.com/commerce/tutorial_info.php?tutorials_id=94).  It 
+  requires an SD card for temporary storage of code to be
+  flashed.  Replacing the current external SPI memory chip with a microSD 
+  socket could make sense.  The socket size is under a cm square, and ones 
+  that have a fold-up locking top are about $2, vs over $6 for the current
+  memory chip.  The cards themselves are getting very cheap, too, and can
+  store much more data than the current 128k memory chip.  This would require 
+  moving ADC_Vbat to a different ADC input so that pins 27, 29, 30, and 31 
+  would be available for the microSD socket.
+
+* Consideration should be given to changing the accelerometer for a higher-G
+  single axis unit as in [TeleMetrum](../TeleMetrum) if we want to be able to
+  use it for motor characterization.