X-Git-Url: https://git.gag.com/?p=fw%2Faltos;a=blobdiff_plain;f=doc%2Feasymotor-installation.inc;fp=doc%2Feasymotor-installation.inc;h=0000000000000000000000000000000000000000;hp=8a4cd77fb0eb7ce29f468a7d442190cb9c6d5977;hb=b8e21caf9602b55e9a042f8f0b3cfed1d8975c15;hpb=6ac9b490efca17b15317965026c56b4a37d6be82

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-== Installation
-
-	EasyMotor needs to be rigidly attached in the airframe, and the
-	long axis of the circuit board needs to be aligned with the axis
-	of flight.  By default, the round beeper on the board should be
-	"up" towards the nose cone, and the screw terminal strips should
-	be "down" towards the fins and motor nozzle end of the rocket.
-
-	=== 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.
-
-		Because he often mounts EasyMotor to the motor's forward 
-		bulkhead instead of to the airframe itself, Bdale often 
-		uses a length of "shooter wire" from an e-match or used 
-		motor igniter as a power switch, routing the wire out of 
-		the typical fin can vent hole and using "twist and tape" 
-		to power up the board.  Whatever works!
-
-	=== Pressure Sensor
-
-		The primary motivation for designing EasyMotor was to have
-		a reliable way of recording motor chamber pressure during
-		flight.  To that end, EasyMotor supports attachment of a
-		low-cost analog pressure sensor.  The board provides 5V
-		to power the sensor, and an input for measuring and 
-		logging the output voltage from the sensor.
-
-		The kind of sensor EasyMotor is designed to work with
-		takes 5V in and has a linear analog output that ranges
-		from 0.5V at 0 to 4.5V at the maximum pressure supported
-		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.
-
-		To log in-flight chamber pressure, a typical approach
-		might be to drill a 1/8" sampling hole all the way 
-		through the center of the motor's forward closure, then
-		drill and tap partially through the closure with a "1/8
-		NPT" pipe tap.  Fill the touch hole with grease, screw in 
-		the pressure sensor, and attach the sensor leads to 
-		EasyMotor.