[[!meta title="EasyMotor"]]
# EasyMotor

This board is designed for in-flight characterization of research rocket
motors.  It records chamber pressure and acceleration to an on-board flash
memory chip, the contents of which can be downloaded after flight over USB.  

## Features ##

### User View ###

* Data logger storing motor chamber pressure and acceleration
* supports inexpensive 5V analog output pressure sensors
* 3-axis 200-g accelerometer
* On-board non-volatile memory for flight data storage
* USB for configuration, and data recovery
* Designed for use with a battery from 9-12V
* 1.5 x 0.8 inch board

## Example Installations ##

These photos are from snap-ring case forward closures machined by Bdale for
test flights of EasyMotor.  The sensor bodies are 316 stainless with a 1/8 NPT
male boss, so the approach chosen is to drill a 1/8 inch touch hole all the
way through the closure, then drill and tap 1/8 NPT female threads part way
through the closure thickness.  The hole gets filled with grease and the 
sensor screwed in.

<a href="photos/IMG_20200905_112722.jpg"> <img src="photos/IMG_20200905_112722-thumb.jpg"></a>
<a href="photos/IMG_20200907_101910.jpg"> <img src="photos/IMG_20200907_101910-thumb.jpg"></a>
<a href="photos/IMG_20201010_142952.jpg"> <img src="photos/IMG_20201010_142952-thumb.jpg"></a>

## Artifacts ##

The firmware for this product is part of the [AltOS](../AltOS) suite.

This board was designed using lepton-eda and pcb-rnd.

The hardware design files are available from 
[git.gag.com](http://git.gag.com) in the project 
[hw/easymotor](http://git.gag.com/?p=hw/easymotor;a=summary).  

## Availability ##

Prototypes of v2 were built and successfully flown.  An initial production 
batch is now underway, and we hope these will be for sale around the end of
calendar year 2020.