[[!meta title="EasyMini"]]
# EasyMini
This is a small, baro-only recording dual-deploy altimeter for
model rocketry
EasyMini version 2.0 is available from the
[Garbee and Garbee](https://shop.gag.com) web store
and from our distributors.
For the latest EasyMini firmware and related ground station software,
please visit the [AltOS](../AltOS) page on this site. EasyMini
version 2.0 requires AltOS version 1.8.4 or later.
These are photos of version 2.0:
## Features ##
### User View ###
* Recording altimeter for model rocketry
* Supports dual deployment (can fire 2 ejection charges)
* Barometric pressure sensor good to 100k feet MSL
* Designed to use a battery supplying 3.7V-12V.
* 1.5 x 0.8 inch board designed to fit inside 24mm airframe coupler tube
* 1MB on-board data logging flash
* Weighs only 6.5g (less than 1/4 oz)
### Developer View ###
* Hardware Features
* [STM32F042](http://www.st.com/en/microcontrollers/stm32f042f6.html) System-on-Chip
* ARM Cortex-M0 MCU
* 32k Flash
* 6k RAM
* USB 2.0
* 8 12-bit analog inputs
* I2C, SPI, async serial
* digital I/O
* [Measurement Specialties MS5607](http://www.meas-spec.com/product/pressure/MS5607-02BA03.aspx) pressure sensor
* 1MB SPI flash
* Software Features
* Written mostly in C with some ARM assembler
* Runs from on-chip flash, uses on-chip RAM, stores flight data to
flash memory part
* Tools Used
* [gEDA](http://www.gpleda.org/) for schematic capture and PCB layout
* [GCC](http://gcc.gnu.org/) compiler and source debugger
* 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)
## Artifacts ##
There is a shorter manual for EasyMini which is available in
[html](../AltOS/doc/easymini.html) and
[pdf](../AltOS/doc/easymini.pdf) formats. EasyMini is also documented
in the comprehensive Altus Metrum manual in
[html](../AltOS/doc/altusmetrum.html) and
[pdf](../AltOS/doc/altusmetrum.pdf) formats
An outline of the board with drill hole locations is available in
[pdf](../AltOS/doc/easymini-outline.pdf) format.
Thanks to Bryan Duke, there's also a 3d model of EasyMini available on
[Thingiverse](http://www.thingiverse.com/thing:1946852).
The hardware design files can be found on [git.gag.com](http://git.gag.com)
in the project [hw/easymini](http://git.gag.com/?p=hw/easymini;a=summary).
For those who don't have ready access to the gEDA suite, here are pdf snapshots
of the files for production PCB version 1.0 in more easily readable form.
* [schematic](v2.0/easymini-sch.pdf)
* [pcb artwork](v2.0/easymini-pcb.pdf)
## Older Version ##
Easy Mini [version 1.0](v1.0) was largely the same design but used a
different processor.
## Features ##
### User View ###
* Recording altimeter for model rocketry
* Supports dual deployment (can fire 2 ejection charges)
* Barometric pressure sensor good to 100k feet MSL
* Designed to use a battery supplying 3.7V-12V.
* 1.5 x 0.8 inch board designed to fit inside 24mm airframe coupler tube
* 1MB on-board data logging flash
* Weighs only 6.5g (less than 1/4 oz)
### Developer View ###
* Hardware Features
* [STM32F042](http://www.st.com/en/microcontrollers/stm32f042f6.html) System-on-Chip
* ARM Cortex-M0 MCU
* 32k Flash
* 6k RAM
* USB 2.0
* 8 12-bit analog inputs
* I2C, SPI, async serial
* digital I/O
* [Measurement Specialties MS5607](http://www.meas-spec.com/product/pressure/MS5607-02BA03.aspx) pressure sensor
* 1MB SPI flash
* Software Features
* Written mostly in C with some ARM assembler
* Runs from on-chip flash, uses on-chip RAM, stores flight data to
flash memory part
* Tools Used
* [gEDA](http://www.gpleda.org/) for schematic capture and PCB layout
* [GCC](http://gcc.gnu.org/) compiler and source debugger
* 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)
## Artifacts ##
There is a shorter manual for EasyMini which is available in
[html](../AltOS/doc/easymini.html) and
[pdf](../AltOS/doc/easymini.pdf) formats. EasyMini is also documented
in the comprehensive Altus Metrum manual in
[html](../AltOS/doc/altusmetrum.html) and
[pdf](../AltOS/doc/altusmetrum.pdf) formats
An outline of the board with drill hole locations is available in
[pdf](../AltOS/doc/easymini-outline.pdf) format.
Thanks to Bryan Duke, there's also a 3d model of EasyMini available on
[Thingiverse](http://www.thingiverse.com/thing:1946852).
The hardware design files can be found on [git.gag.com](http://git.gag.com)
in the project [hw/easymini](http://git.gag.com/?p=hw/easymini;a=summary).
For those who don't have ready access to the gEDA suite, here are pdf snapshots
of the files for production PCB version 1.0 in more easily readable form.
* [schematic](v2.0/easymini-sch.pdf)
* [pcb artwork](v2.0/easymini-pcb.pdf)
## Older Version ##
Easy Mini [version 1.0](v1.0) was largely the same design but used a
different processor.