X-Git-Url: https://git.gag.com/?a=blobdiff_plain;f=doc%2Fmotortest-installation.inc;h=1edee68d4c57293bb32a12e53d854b623a9863c2;hb=bcc15fb429724956e72f06a4f4b1002b1def7a94;hp=290c7b8fa7d3542511944278321f2ae77c012bb6;hpb=1451e2fd2092d720b0d49b93ac01bed7e88b831f;p=fw%2Faltos diff --git a/doc/motortest-installation.inc b/doc/motortest-installation.inc index 290c7b8f..1edee68d 100644 --- a/doc/motortest-installation.inc +++ b/doc/motortest-installation.inc @@ -9,14 +9,11 @@ === Power Switch and Battery In addition to the circuit board itself, EasyMotor needs - a power switch and battery to operate. Unlike most other - Altus Metrum products, EasyMotor does not work with - single-cell LiPo batteries. That's because commonly - available inexpensive pressure sensors need 5V, which is - more than a single-cell LiPo provides. Any battery that - provides from 6.5 to about 15 volts should work. Good - choices are the common 9V alkaline battery, or the very - small and light A23 12V alkaline batteries. + a power switch and battery to operate. Like many Altus + Metrum products, EasyMotor requires a single-cell LiPo + battery, and has an on-board charging circuit. The 5V + needed for inexpensive pressure sensors is generated + onboard using a switching regulator to boost the voltage. Because he often mounts EasyMotor to the motor's forward bulkhead instead of to the airframe itself, Bdale often @@ -40,7 +37,8 @@ by the sensor. Very inexpensive sensors that have a “1/8 NPT” threaded input, a “Buick-style” 3-pin connector, and typically ship with a short cable and mating - connector, are readily available on eBay and AliExpress. + connector, are readily available through various vendors + including Amazon, eBay, and AliExpress. To log in-flight chamber pressure, a typical approach might be to drill a 1/8" sampling hole all the way @@ -49,3 +47,8 @@ NPT” pipe tap. Fill the touch hole with grease, screw in the pressure sensor, and attach the sensor leads to EasyMotor. + + If you aren't up for machining closures yourself, + link:http://lokiresearch.com[Loki Research] sells + 54mm and 75mm "experimental bulkheads" with threaded + sensor ports that can be used with snap ring cases.