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[[!meta title="MicroPeak"]]
<img src="../logos/micropeak-oneline.svg" height="100"/>
# Introducing MicroPeak by AltusMetrum #
Micropeak is a peak-recording barometric altimeter for precision model
rocketry altitude measurements.
<a href="v1.0/micropeak-dime.jpg"><img
src="v1.0/micropeak-dime-640.jpg"></a>
Production units are available from the
[Garbee and Garbee](http://auric.gag.com/index.php?route=product/product&product_id=80)
web store and [Apogee Components](http://www.apogeerockets.com/Electronics_Payloads/Altimeters/MicroPeak_Altimeter)
## Documentation ##
The MicroPeak manual is available in
[html](../AltOS/doc/micropeak.html) and
[pdf](../AltOS/doc/micropeak.pdf) formats.
## Software ##
The MicroPeak application runs on Linux, Mac OS X and Windows. It
communicates with the MicroPeak USB adapter to download and analyze
flight data. It's written in [Java](http://java.com) and offers the
same functionality and interface on all three platforms. It uses the
FTDI USB Serial drivers to communicate with the hardware. If you're
running Mac OS X or Windows, a compatible version of those drivers is
included with the software. You can also install a different from from
the [FTDI Driver](http://www.ftdichip.com/FTDrivers.htm) page.
### Latest version ###
* [Windows](releases/1.2/MicroPeak-Windows-1-1-9-3.exe)
* [Linux](releases/1.2/MicroPeak-Linux-1.1.9.3.tar.bz2)
* [Mac OS X](releases/1.2/MicroPeak-Mac-1.1.9.3.dmg)
## Hardware Features ##
* Measure ground pressure and peak altitude pressure.
* Orange LED blinks out maximum height in decimeters.
* 18mm x 14mm. 1.9g including battery.
* Power switch.
The CR1025 battery holder is mounted on the back side of the board, so there are no external wires or batteries to manage.
## Software features ##
* Saves last flight data to non-volatile memory.
* Reports previous flight on power-on.
* Automatically shuts down on landing to preserve battery.
## Battery Holder ##
MicroPeak includes an integrated battery holder on the back side of
the circuit board.
<a href="v1.0/micropeak-back.jpg"><img
src="v1.0/micropeak-back-640.jpg"></a>
## Developer View ##
Here's a close-up view of the hardware
<a href="v1.0/micropeak.jpg"><img src="v1.0/micropeak-640.jpg"></a>
* Hardware Features
* [ATMEL ATtiny85](http://www.atmel.com/devices/attiny85.aspx) Microcontroller
* 8K flash
* 512B RAM
* 512B EEPROM
* SPI/I2C interface
* [Measurement Specialties MS5607](http://www.meas-spec.com/product/t_product.aspx?id=8499) Micro Altimeter Module
* Wide range — 120kPa to 1kPa (approximately -1500m to 31000m)
* High precision — 2.4Pa resolution (approximately 20cm at sea level)
* Factory calibrated.
* CR1025 Lithium Battery
* 30mAh. Runs MicroPeak for more than 40 hours on the pad or in flight
* [OSRAM LO T67K](http://catalog.osram-os.com/catalogue/catalogue.do?favOid=000000000002269f00090023&act=showBookmark) orange LED
* Standard 6-pin AVR programming interface.
* Software Features
* Written in C
* Samples pressure every 96ms
* Delay 30s after power-on to finish airframe prep
* Detect boost with 10m altitude change
* Exponential averaging filter to minimize transient effects.
* Tools Used
* [gEDA](http://www.gpleda.org/) for schematic capture and PCB layout
* [GCC](http://gcc.gnu.org) as an AVR cross-compiler
* 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)
<center><img src="../logos/micropeak.svg" height="64"/>
|
