Editing Rocket computer

What kind of electronics are small enough to fit into a small hobby [http://en.wikipedia.org/wiki/Model_rocket model rocket] [[vehicle]]?
Long and skinny, to fit in those rocket tubes.

* [http://www.altusmetrum.org/ Altus Metrum] has open hardware and software designs for high powered model rocketry avionics solutions, such as the [http://www.altusmetrum.org/TeleMetrum/ TeleMetrum] altimeter with integrated telemetry link.
* [http://www.taniwha.com/~paul/fc/ "Taniwha Flight Computer"] by Paul Campbell: "the DAC is no longer easily available - we need to lay out a new board for a more modern part"
* [http://www.ibiblio.org/pub/archives/rec.models.rockets/ELECTRONICS/ "Small Altimeter for Model Rockets"] by Herve Cousin
* [http://www.geocities.com/researchtriangle/lab/6584/r_timer.html rocket timer] (found via [http://www.picguide.org/rocket-timer-pic16f84/ rocket timer]) (uses TC4422 "9 A mosfet driver" to power the igniter; but first uses the PIC16F84 to delay the right time ... what are the *other* connectors on the board for?)
* [http://markworld.com/hamradio/buildbeacon.html "A miniature 2 meter beacon for rocketry and balloons"] by KB0VVQ; [http://www.markworld.com/hamradio/cwbeacon.html "beacon"]; "... The tricky bit is running the PIC off the same oscillator. ..."
* [http://www.jbgizmo.com/page22.html "Beeping" Tracking Transmitter Kit]
* [http://www.jbgizmo.com/page13.html directional antenna for inexpensive pocket radios]

[[User:DavidCary|DavidCary]] is designing a "small rocket computer" that can fit inside an off-the-shelf small model rocket, rather than requiring a "high powered model rocket".
One that is as narrow as a 13 mm "mini engine", narrower than a 14 mm AA battery, much less a 18 mm "standard engine".

ideas:
* accelerometer to log the accelerations during flight.
* pressure sensor to measure barometric altitude
* beeper to help find it
* ...
* What other electronics would be useful to put into a small hobby model rocket?
* ...

Once has measured the maximum barometric altitude (and other data), how should it communicate that to us?
Some communication options are:
* Re-use the direction-finding beacon as a RF Morse code transmitter. Use ordinary radio to listen.
* Put little blinky lights on-board -- blink out Morse code, or use a binary-clock-like lightbar or miniature 7 segment LED display.
* Put a tiny LCD display on-board.
* Drop the rocket computer into a "cradle" with a LCD display.
* Put a standard socket on-board. Plug a cable between the rocket computer and a standard laptop. RS232 on RJ11? RS232 on TRRS plug? Micro-USB?.



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 * [http://www.jbgizmo.com/page22.html "Beeping" Tracking Transmitter Kit]
 * [http://www.jbgizmo.com/page13.html directional antenna for inexpensive pocket radios]
-* [http://www.jameco.com/Jameco/PressRoom/rocket.html "Radio Locator Beacon for Flying Objects"] by Dan Gravatt 2009 "It weighs about an ounce with its 12-volt A23 alkaline battery ... 9/16" inches wide to fit inside an Estes BT-20 tube ... If the spring-loaded terminal of the battery holder is "down", when the rocket launches the acceleration will cause the battery to compress that spring, turning off the transmitter."
-* [http://spritesmods.com/?art=rocketlogger "Rocket acceleration logger"]: ATTiny13 logging data from a 3-axis acceleration sensor -- a Freescale MMA7260 scavenged from an off-brand Wii Nunchuck -- to a 32KByte 24C256 EEPROM. All the electronics much smaller than the small Li-ion battery powering it. It survived the trip and a fall into mud (with no parachute!).
 [[User:DavidCary|DavidCary]] is designing a "small rocket computer" that can fit inside an off-the-shelf small model rocket, rather than requiring a "high powered model rocket".
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-* [http://electronics.stackexchange.com/questions/34498/recovering-data-from-a-saturated-accelerometer Recovering data from a rocket-mounted accelerometer]