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by daveake
Thu Apr 21, 2016 3:37 pm
Forum: High Altitude Balloon
Topic: Hardware List
Replies: 12
Views: 2781

Re: Hardware List

That's a large percentage of the total I've spent on aerials over the years! For anyone else watching, all you really need is this for the chase car: http://cpc.farnell.com/1/1/21033-watson-wsm-270-mini-mag-antenna.html (£17) That's the minimum spend. Next purchase should be a Yagi for the chase car...
by daveake
Thu Apr 21, 2016 8:04 am
Forum: High Altitude Balloon
Topic: Which Model RPi for HAB
Replies: 28
Views: 4618

Re: Which Model RPi for HAB

Yes, looks like it's getting an update to 512MB - see https://www.raspberrypi.org/forums/viewtopic.php?f=63&t=145178 I've ordered a couple from Farnell, and was told that delivery is expected w/c 18/07/2016. The extra RAM won't make any difference to PITS so if you can get an A+ now then do so rathe...
by daveake
Mon Apr 18, 2016 8:37 am
Forum: High Altitude Balloon
Topic: Which Model RPi for HAB
Replies: 28
Views: 4618

Re: Which Model RPi for HAB

From http://www.pi-in-the-sky.com/index.php?id=support:

"The current (PITS+) board works with the model A+, B+ or V2 B Raspberry Pi. We recommend the use of a B+ for development and an A+ for the flight. The extra processing power of the V2 Pi is not required for this application."
by daveake
Mon Apr 18, 2016 8:36 am
Forum: High Altitude Balloon
Topic: Hardware List
Replies: 12
Views: 2781

Re: Hardware List

by daveake
Sun Apr 17, 2016 3:58 pm
Forum: High Altitude Balloon
Topic: Hardware List
Replies: 12
Views: 2781

Re: Hardware List

LoRa and RTTY are just different ways of modulating data onto the radio frequency, so you use exactly the same aerials for one as for the other. All 1/4 wave antennae are simple a transmitting element 1/4 wave long (which is 164mm for 434MHz), and something to emulate an infinite ground plane (effec...
by daveake
Fri Apr 15, 2016 7:22 pm
Forum: High Altitude Balloon
Topic: Which Model RPi for HAB
Replies: 28
Views: 4618

Re: Which Model RPi for HAB

B+ is easier to network. A+ is possible but you'll need a USB-LAN adapter otherwise you need to set up wifi on it.

Dave
by daveake
Fri Apr 15, 2016 7:15 pm
Forum: High Altitude Balloon
Topic: Hardware List
Replies: 12
Views: 2781

Re: Hardware List

You said "have been advised that 1/4 wave antenna's will not work" That's not what Steve said in the UKHAS conversation. That was about using 1/4 elements in a composite (colinear) antenna. That's a completely different situation to a single-element 1/4 wave antenna. For the payload you should use a...
by daveake
Fri Apr 15, 2016 2:18 pm
Forum: High Altitude Balloon
Topic: Hardware List
Replies: 12
Views: 2781

Re: Hardware List

No LoRa: The PITS kit has everything you need for the tracker electronics, aside from Pi/camera/batteries. The aerial is a "pigtail" which means a short piece of cable with a plug on the end; you make this into an aerial as per the supplied instructions. If you haven't done so, please read the PITS ...
by daveake
Fri Apr 15, 2016 12:17 pm
Forum: High Altitude Balloon
Topic: Hardware List
Replies: 12
Views: 2781

Re: Hardware List

I've answered this on the UKHAS mailing list (https://groups.google.com/forum/#!forum/ukhas), but for those who aren't members ... Yes, SSDV works over RTTY or LoRa. For LoRa you need one of those boards on the tracker, and another one on the ground, so that needs another Pi. See http://www.daveaker...
by daveake
Tue Apr 12, 2016 4:31 pm
Forum: High Altitude Balloon
Topic: using Pi in sky AND(?) sense hat?
Replies: 12
Views: 3322

Re: using Pi in sky AND(?) sense hat?

It's not something we test so I don't know if you've damaged it. We had someone else find an inventive way of putting the board on, and they didn't fry anything, but that's not to say that you haven't. We responded by putting "This way up" on the top and "NOT this way up" on the bottom. We also have...
by daveake
Wed Apr 06, 2016 1:50 pm
Forum: High Altitude Balloon
Topic: Which Model RPi for HAB
Replies: 28
Views: 4618

Re: Which Model RPi for HAB

It's not the default - the as-installed config.txt does not contain that entry, so it needs adding, if device tree is enabled. The DS18B20 doesn't work by default anyway. On the old method you need to either make changes to /etc/modules or include modprobe statements in your code. It's just a diffe...
by daveake
Wed Apr 06, 2016 11:24 am
Forum: High Altitude Balloon
Topic: Which Model RPi for HAB
Replies: 28
Views: 4618

Re: Which Model RPi for HAB

No, there's no hardware conflict between the boards. The Sense HAT software requires that device tree is enabled, and that is what stops the DS18B20 from working. Easily fixed with a config change, as per my link above. Dave Device tree doesn't stop the DS18B20 working. The config change is the sta...
by daveake
Wed Apr 06, 2016 11:22 am
Forum: High Altitude Balloon
Topic: Which Model RPi for HAB
Replies: 28
Views: 4618

Re: Which Model RPi for HAB

texy wrote: Yes - that's why I asked. I have DS18B20 working fine with DT and latest Raspbian with the default config.txt entry ( dtoverlay=w1-gpio ) and GPIO wiring.
Texy
It's not the default - the as-installed config.txt does not contain that entry, so it needs adding, if device tree is enabled.

Dave
by daveake
Wed Apr 06, 2016 8:31 am
Forum: High Altitude Balloon
Topic: Which Model RPi for HAB
Replies: 28
Views: 4618

Re: Which Model RPi for HAB

No, there's no hardware conflict between the boards. The Sense HAT software requires that device tree is enabled, and that is what stops the DS18B20 from working.

Easily fixed with a config change, as per my link above.

Dave
by daveake
Mon Apr 04, 2016 1:30 pm
Forum: High Altitude Balloon
Topic: Which Model RPi for HAB
Replies: 28
Views: 4618

Re: Which Model RPi for HAB

No the two work together. You need to make sure device tree is enabled (so ignore the PITS instructions where you are told to disable it). Device tree currently stops the DS18B20 temperature sensor from working but that's easily fixed. We have a support page all about this - http://www.pi-in-the-sky...
by daveake
Mon Apr 04, 2016 1:27 pm
Forum: High Altitude Balloon
Topic: Sense hat out of stock till Aug!
Replies: 2
Views: 1678

Re: Sense hat out of stock till Aug!

I'd just get a Pi prototyping board, add whatever I2C sensors you're interested in to that, then code up some Python to read and log the sensor values.

If you want to include those values in the telemetry, then yes you would need to modify the C source code to pick up the sensor values.

Dave
by daveake
Sat Mar 26, 2016 10:09 pm
Forum: High Altitude Balloon
Topic: Base Station and Chase Car Trackers
Replies: 1
Views: 1326

Re: Base Station and Chase Car Trackers

Yes.
by daveake
Sat Mar 26, 2016 10:08 pm
Forum: High Altitude Balloon
Topic: Which Model RPi for HAB
Replies: 28
Views: 4618

Re: Which Model RPi for HAB

The old PITS (for model A/B) is no longer available.

Best Pi for HAB remains the A+.

Dave
by daveake
Sat Mar 26, 2016 10:07 pm
Forum: High Altitude Balloon
Topic: How to get started + Cost
Replies: 1
Views: 1553

Re: How to get started + Cost

You can't get what you need from Amazon; you need specialist suppliers and I heartily recommend these two: https://store.uputronics.com/ http://randomsolutions.co.uk/Random_Aerospace/Welcome.html Cost depends enormously on what you want to achieve, but a rough number to give you an idea is £500. Hav...
by daveake
Tue Mar 22, 2016 3:58 pm
Forum: High Altitude Balloon
Topic: DIY GPS Radio Tracker
Replies: 2
Views: 1563

Re: DIY GPS Radio Tracker

The schematics and PCB files are on github, linked to from the PITS site.

Dave
by daveake
Fri Feb 26, 2016 8:36 pm
Forum: High Altitude Balloon
Topic: using Pi in sky AND(?) sense hat?
Replies: 12
Views: 3322

Re: using Pi in sky AND(?) sense hat?

The HABAmp includes a band-pass filter, so will largely prevent frequencies other than the ones you are interested in from reaching the Funcube. If you're anywhere near a powerful transmitter then this is a good thing.

Dave
by daveake
Wed Feb 24, 2016 1:44 pm
Forum: High Altitude Balloon
Topic: using Pi in sky AND(?) sense hat?
Replies: 12
Views: 3322

Re: using Pi in sky AND(?) sense hat?

The GPS aerial isn't for the TV dongle. Perhaps I should explain how this all works ... PITS H/W is a GPS module and a UHF radio transmitter, plus a power supply and a couple of sensors, on a board that plugs into the Pi. It comes with a GPS aerial and a UHF aerial. The PITS software then gets the p...
by daveake
Mon Feb 22, 2016 8:53 pm
Forum: High Altitude Balloon
Topic: using Pi in sky AND(?) sense hat?
Replies: 12
Views: 3322

Re: using Pi in sky AND(?) sense hat?

By far the most reliable, and the only option that will give you the balloon position throughout the flight, is a direct radio link from balloon to ground. This is what PITS does, using a suitable receiver (e.g. the TV dongle) on the ground. Those dongles need to be used with the correct aerial (not...
by daveake
Sun Feb 21, 2016 4:10 pm
Forum: General discussion
Topic: Balloon computing....
Replies: 7
Views: 1212

Re: Balloon computing....

As far as how long it can stay airborne? A big range.. a few miles for some party balloons to a few weeks with professional 'weather' type balloons. Actually, it's the opposite. Weather balloons are made from latex. This expands with altitude until the balloon pops (typically after 90 minutes or so...
by daveake
Sun Feb 21, 2016 4:04 pm
Forum: High Altitude Balloon
Topic: using Pi in sky AND(?) sense hat?
Replies: 12
Views: 3322

Re: using Pi in sky AND(?) sense hat?

Yes the 2 boards work together. You need to have device tree enabled (which is opposite to our normal instructions) and that will then stop the DS18B20 temperature sensor from working, but this is easily fixed. See http://www.pi-in-the-sky.com/index.php? ... o-pi-board for more information.

Dave

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