I can't seem to find a block wiring diagram in the for any of the flight
computers. There's verbose descriptions of the screw terminals, but even
those leave me guessing a bit. There are also other connectors on some
boards that I do not know what they are for.
For instance, the Telemetrum wiring chart says:
1 Switch Output Switch connection to flight computer
2 Switch Input Switch connection to positive battery terminal
3 Main + Main pyro channel common connection to battery
4 Main - Main pyro channel connection to pyro circuit
5 Apogee + Apogee pyro channel common connection to battery
6 Apogee - Apogee pyro channel connection to pyro circuit
So here is where my confusion comes in. For instance: Pins 1 & 2 appear to
be the pins you connect the switch on the airframe across. However, pin 2
mentions connection to positive battery terminal. Does that mean that pin 2
makes a connection to the battery internally or does it mean I need to loop
the switch circuit through the battery? IF it is internal, where does the
battery connect? Does it connect at the little white Molex header?
The same sort of confusion comes in on the pyro channels. A simple block
diagram would solve all my confusion. Can anyone provide me typical wiring
block schematics?
What are the little red headers for on the Telemetrum?
Thanks,
Scott Myers
AC8DE
So, what happens when there is a momentary loss of power on an Altus Metrum
product. Say a switch contact bounces under shock and we get a 50 mS drop
in supply. Will they reboot, or is there enough capacitance in the circuit
to keep it live for that short time. (Say C39 capacitor on the Telemetrum?)
Of course one does what they can so there is zero loss in power under all
conditions.
Scott Myers
Hi all,
for a group project I'm looking for a backup altimeter for drogue
deployment. Preferably, it should be small enough to be mounted
horizontally within 68mm diameter. It also shouldn'trequire a vertical
orientation for operation - which, If I understand this correctly, is
the case for the bigger, accelerometer based, Altus Metrum devices.
If the rocket performs as hoped, the upper stage's altitude will exceed
the maximum altitude where the MS5607 is usable, so I thought about
using timer based deployment. On the other hand, if the upper stage
doesn't ignite, apogee detection would be desirable.
I thought about configuring it as follows (two ematches, same charge)
Channel 1: altitude > some_threshold && time > xx
Channel 2: altitude < some_threshold && descending
The plan is to select some_threshold slightly above the expected
altitude in case of a non-ignition of the the upper stage motor and well
below were we'd expect sensor noise to be significant in relation to
static pressure.
Does this approach seem viable? Is there something that we'd need to be
aware of with regards to the behavior of the sensor or Kalman filter
when flying beyond ~100kft?
Thanks,
Reinhard
Can I use a TeleGPS with (just) a Kenwood TH-D72?
The document has:
"Connect TeleDongle to your computer and start TeleGPS or start AltosDroid
on your android
device and connect to TeleBT. Set the frequency to match the TeleGPS and
you should be receiving
telemetry."
But it also discusses Kenwood TH-72A in A.2. APRS
Keith and I both hope to be able to attend "Thunda Down Under"[1] in
2015, and I've sent the organizers email requesting information on what
it takes to be treated as an on-site vendor.
Of course, it's always more fun to be at a launch when you have something
interesting to fly! Thus, while Keith and I might each show up with a
modest "travel rocket" of some sort... I've started pondering possible
larger "Altus Metrum" group projects. Since transporting a large
airframe to Australia would be a hassle, I wonder if a group project to
build an airframe in-country makes more sense? To that end, I'd be
pleased to know if any of our friends and customers in Australia want to
sign up to help with such a project?
My thoughts would be to engage in some group-think about project scope
and goals, then hope friends in-country would take on the sourcing and
preparation of suitable airframe materials. Depending on who wants to
participate and how tasks get taken up, we might plan to arrive a bit
early to help with any final assembly or other preparations,
installation of suitably fresh Altus Metrum electronics, etc.
So, to all our Aussie friends... does this sound like fun? If so,
please chime in with a reply. I don't expect the email associated with
such a project to be too heavy a load for this list to carry, but we can
always spawn a dedicated lists.gag.com list if I'm wrong.
Regards,
Bdale
[1] http://thunda.com.au/
I'm pleased to announce that Altus Metrum has added a new, smaller,
fourth battery to our line of lithium-polymer cells designed
specifically for use with our flight computers. The new battery is
approximately 4 x 15 x 30mm and 120mAh. While compatible with any of
our products, these batteries were specifically chosen to allow use of
the new TeleMini v3.0 in 18mm airframe tubing! The new batteries are
now in stock for immediate delivery.
For more details, see
http://shop.gag.com/parts-and-accessories/120mah-lipo-battery.html
and
http://shop.gag.com/flight-computers/telemini-v3.html
I'm also pleased to report that LipoCharger is back in stock after a
long hiatus. The low current setting is ideal for use with the new
120mAh batteries. For more details, see
http://shop.gag.com/parts-and-accessories/lipocharger-v1-1.html
Enjoy!
Bdale
I am putting the finishing touches to my very first rocket with
electronics, and configuring the TeleMetrum I just received.
My ground station is the Bluetooth-enabled version, and I was hoping to
use bluetooth communications on the Java ground station program on my Mac -
I use one of those small hipster Macbooks with just one USB C port, so
bluetooth communications suddenly look appealing.
I can easily pair the BT module (it is a standard SPP profile, supported
like a classic serial port on the Mac), but it looks like the ground
station filters out ports to only recognize the USB version of the ground
station - is there any way you could consider including Bluetooth ports in
a new version, at least on the Mac? I'll take a look at the source when I
have a minute as well, it is probably merely a matter of not filtering out
SPP ports on the select dialog...
Thanks!
Ed
