X-Git-Url: https://git.gag.com/?a=blobdiff_plain;f=EasyMotor%2Findex.mdwn;h=87c8f6228f2ba60a82020dfa283493913f544519;hb=deb751a72972f658b3ad066a2e32016614693754;hp=25b4c82f820668b78e7fb6bd0daab11abedc6a4d;hpb=1e00bb100c28342e94b7f819cb8c8a11067f1bb3;p=web%2Faltusmetrum diff --git a/EasyMotor/index.mdwn b/EasyMotor/index.mdwn index 25b4c82..87c8f62 100644 --- a/EasyMotor/index.mdwn +++ b/EasyMotor/index.mdwn @@ -4,16 +4,6 @@ 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. -It can also be attached to a [TeleMetrum](../TeleMetrum) or -[TeleMega](../TeleMega) using the companion interface to allow a subset of -the data to be included in radio telemetry during the flight. - -There is no EasyMotor firmware yet, but it will be part of the -[AltOS](../AltOS) suite eventually. - -Prototypes of v1 were built and evaluated, prototypes of v2 are -underway. This design is not yet for sale, but we hope to have it on the -market by mid-summer 2020. ## Features ## @@ -27,11 +17,57 @@ market by mid-summer 2020. * Designed for use with a battery from 9-12V * 1.5 x 0.8 inch board +## Example Installations ## + +There are lots of ways to mount an EasyMotor board, but since we've been +asked, here are a few 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. The first example is a 98mm snap-ring clossure, with the +sensor and electronics mounted off-center so a 3/8" all-thread could be used +in the center for motor retention in a minimum-diameter-ish airframe. The +mounting bracket for the electronics was bent from a bit of 1/16" aluminum +sheet and screwed to the forward closure with two short 4-40 screws into +tapped and drilled mounting holes. Note the use of an A23 12v alkaline battery +in a holder on the bracket wiht the +EasyMotor prototype. These batteries are fine for a flight or two, and both +they and the little holders for them are cheap on Amazon and make installations +like this fairly easy to put together: + + + +This second example is on a 75mm snap-ring closure, and was Bdale's first attempt +using 16-gauge steel to bend a mounting bracket that could also be used for recovery +harness attachment. Another A23 and holder are taped on the other side of the +sensor not visible in this photo: + + + +This example is a refinement of the 16-gauge steel strap used to form a mounting +bracket and harness retention point, this time for a 54mm snap-ring closure. +Bdale has flown this setup several times now, and the only down-side is that +it obvious takes up a few extra inches of airframe length. Note the quik-link +wrapped in electrical tape to make sure it doesn't flop down and short against +any of the electronics in flight. Note also a long piece of shooter wire that +gets fed through a vent hole in the airframe as a twist-n-tape power switch. + + + ## 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.