X-Git-Url: https://git.gag.com/?a=blobdiff_plain;f=doc%2Fmotortest-installation.inc;fp=doc%2Fmotortest-installation.inc;h=3914bc709b1ffbc0d136211601454f9b54547390;hb=96181ff1e0d376d7a2c9519abbf4f346d8fd47ea;hp=1edee68d4c57293bb32a12e53d854b623a9863c2;hpb=22f9fb47d97ba13f6b30fab25bce552bccc91997;p=fw%2Faltos

diff --git a/doc/motortest-installation.inc b/doc/motortest-installation.inc
index 1edee68d..3914bc70 100644
--- a/doc/motortest-installation.inc
+++ b/doc/motortest-installation.inc
@@ -1,10 +1,27 @@
 == 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.
+	[WARNING]
+	Firmware versions prior to 1.9.13 used acceleration to detect
+	launch.  Starting with 1.9.13, the firmware switched to using
+	pressure to trigger recording. Altus Metrum strongly recommends 
+	upgrading all EasyMotor boards to current firmware, the
+	behavior of which is described here.
+
+	EasyMotor needs to be rigidly attached in the airframe, in any
+	convenient orientation.
+
+	=== Trigger to Start Recording
+
+	Starting with firmware version 1.9.13, a pressure sensor must
+	be attached, and pressure change is used to initiate and conclude
+	data recording.  Pressure and 3 axes of acceleration are recorded
+	for later analysis.
+
+	EasyMotor looks for a 50 psi rise in pressure from ambient to
+	start recording.  Recording stops when the pressure drops 
+	below 50 psi and shows variation of less than 30 psi for at 
+	least 10 seconds. These conditions are intended to capture all
+	actual burn data including anomalies such as "chuffs".
 
 	=== Power Switch and Battery