X-Git-Url: https://git.gag.com/?a=blobdiff_plain;f=doc%2Faltusmetrum.xsl;h=885c573e15b3b684ad5540753405bd467f192d34;hb=0948f5d96456b2e7f57ad75dfc9ef455ba197163;hp=d253f96c4262c2e6a905f035b81321fcedae72a3;hpb=eb3ffd06575ddd0be061aa2717c7075c823ed54e;p=fw%2Faltos
diff --git a/doc/altusmetrum.xsl b/doc/altusmetrum.xsl
index d253f96c..885c573e 100644
--- a/doc/altusmetrum.xsl
+++ b/doc/altusmetrum.xsl
@@ -25,6 +25,11 @@
2014
Bdale Garbee and Keith Packard
+
+
+
+
+
This document is released under the terms of the
@@ -1316,6 +1321,18 @@ NAR #88757, TRA #12200
terminals to hook up all of the pyro charges.
+
+ Using Only One Battery With TeleMega
+
+ Because TeleMega has built-in support for a separate pyro
+ battery, if you want to fly with just one battery running
+ both the computer and firing the charges, you need to
+ connect the flight computer battery to the pyro
+ circuit. TeleMega has two screw terminals for thisâhook a
+ wire from the Lipo terminal (Bottom 3) to the Pyro terminal
+ (Bottom 2).
+
+
Using an Active Switch with TeleMega
@@ -1522,10 +1539,13 @@ NAR #88757, TRA #12200
first five seconds of operation.
- At power on, you will hear three beeps or see three flashes
- (âSâ in Morse code for start up) and then a pause while
- the altimeter completes initialization and self test, and decides
- which mode to enter next.
+ At power on, the altimeter will beep out the battery voltage
+ to the nearest tenth of a volt. Each digit is represented by
+ a sequence of short âditâ beeps, with a pause between
+ digits. A zero digit is represented with one long âdahâ
+ beep. Then there will be a short pause while the altimeter
+ completes initialization and self test, and decides which mode
+ to enter next.
Here's a short summary of all of the modes and the beeping (or
@@ -1553,7 +1573,7 @@ NAR #88757, TRA #12200
Startup
S
- dit dit dit
+ battery voltage in decivolts
Calibrating sensors, detecting orientation.
@@ -1596,7 +1616,7 @@ NAR #88757, TRA #12200
dit dit dah dit
- Decellerating, but moving faster than 200m/s.
+ Decelerating, but moving faster than 200m/s.
@@ -1606,7 +1626,7 @@ NAR #88757, TRA #12200
dah dit dah dit
- Decellerating, moving slower than 200m/s
+ Decelerating, moving slower than 200m/s
@@ -1992,22 +2012,112 @@ NAR #88757, TRA #12200
time, and would of course appreciate customer feedback on
performance in higher altitude flights!
+
+
+ APRS
TeleMetrum v2.0 and TeleMega can send APRS if desired, and the
interval between APRS packets can be configured. As each APRS
packet takes a full second to transmit, we recommend an
interval of at least 5 seconds to avoid consuming too much
- battery power or radio channel bandwidth.
+ battery power or radio channel bandwidth. You can configure
+ the APRS interval using AltosUI; that process is described in
+ the Configure Altimeter section of the AltosUI chapter.
+
+
+ AltOS uses the APRS compressed position report data format,
+ which provides for higher position precision and shorter
+ packets than the original APRS format. It also includes
+ altitude data, which is invaluable when tracking rockets. We
+ haven't found a receiver which doesn't handle compressed
+ positions, but it's just possible that you have one, so if you
+ have an older device that can receive the raw packets but
+ isn't displaying position information, it's possible that this
+ is the cause.
+
+
+ The APRS packet format includes a comment field that can have
+ arbitrary text in it. AltOS uses this to send status
+ information about the flight computer. It sends four fields as
+ shown in the following table.
+
+
+ Altus Metrum APRS Comments
+
+
+
+
+
+
+
+ Field
+ Example
+ Description
+
+
+
+
+ 1
+ L
+ GPS Status U for unlocked, L for locked
+
+
+ 2
+ 6
+ Number of Satellites in View
+
+
+ 3
+ B4.0
+ Altimeter Battery Voltage
+
+
+ 4
+ A3.7
+ Apogee Igniter Voltage
+
+
+ 5
+ M3.7
+ Main Igniter Voltage
+
+
+
+
+
+ Here's an example of an APRS comment showing GPS lock with 6
+ satellites in view, a primary battery at 4.0V, and
+ apogee and main igniters both at 3.7V.
+
+ L6 B4.0 A3.7 M3.7
+
+
+
+ Make sure your primary battery is above 3.8V, any connected
+ igniters are above 3.5V and GPS is locked with at least 5 or 6
+ satellites in view before flying. If GPS is switching between
+ L and U regularly, then it doesn't have a good lock and you
+ should wait until it becomes stable.
+
+
+ If the GPS receiver loses lock, the APRS data transmitted will
+ contain the last position for which GPS lock was
+ available. You can tell that this has happened by noticing
+ that the GPS status character switches from 'L' to 'U'. Before
+ GPS has locked, APRS will transmit zero for latitude,
+ longitude and altitude.
Configurable Parameters
Configuring an Altus Metrum altimeter for flight is very
- simple. Even on our baro-only TeleMini and EasyMini boards, the use of a Kalman
- filter means there is no need to set a âmach delayâ. The few
- configurable parameters can all be set using AltosUI over USB or
- or radio link via TeleDongle.
+ simple. Even on our baro-only TeleMini and EasyMini boards,
+ the use of a Kalman filter means there is no need to set a
+ âmach delayâ. The few configurable parameters can all be set
+ using AltosUI over USB or or radio link via TeleDongle. Read
+ the Configure Altimeter section in the AltosUI chapter below
+ for more information.
Radio Frequency
@@ -2023,6 +2133,35 @@ NAR #88757, TRA #12200
frequency to successfully communicate with each other.
+
+ Callsign
+
+ This sets the callsign used for telemetry, APRS and the
+ packet link. For telemetry and APRS, this is used to
+ identify the device. For the packet link, the callsign must
+ match that configured in AltosUI or the link will not
+ work. This is to prevent accidental configuration of another
+ Altus Metrum flight computer operating on the same frequency nearby.
+
+
+
+ Telemetry/RDF/APRS Enable
+
+ You can completely disable the radio while in flight, if
+ necessary. This doesn't disable the packet link in idle
+ mode.
+
+
+
+ APRS Interval
+
+ This selects how often APRS packets are transmitted. Set
+ this to zero to disable APRS without also disabling the
+ regular telemetry and RDF transmissions. As APRS takes a
+ full second to transmit a single position report, we
+ recommend sending packets no more than once every 5 seconds.
+
+
Apogee Delay
@@ -2217,7 +2356,7 @@ NAR #88757, TRA #12200
Fast. The motor has burned out and the rocket is
- descellerating, but it is going faster than 200m/s.
+ decelerating, but it is going faster than 200m/s.
@@ -2932,9 +3071,10 @@ NAR #88757, TRA #12200
APRS Interval
- How often to transmit GPS information via APRS. This option
- is available on TeleMetrum v2 and TeleMega
- boards. TeleMetrum v1 boards cannot transmit APRS
+ How often to transmit GPS information via APRS (in
+ seconds). When set to zero, APRS transmission is
+ disabled. This option is available on TeleMetrum v2 and
+ TeleMega boards. TeleMetrum v1 boards cannot transmit APRS
packets. Note that a single APRS packet takes nearly a full
second to transmit, so enabling this option will prevent
sending any other telemetry during that time.
@@ -4990,7 +5130,8 @@ NAR #88757, TRA #12200
-
+
@@ -5004,7 +5145,8 @@ NAR #88757, TRA #12200
-
+
@@ -5018,7 +5160,8 @@ NAR #88757, TRA #12200
-
+
@@ -5032,7 +5175,8 @@ NAR #88757, TRA #12200
-
+