Search found 1057 matches

by strud
Tue Oct 27, 2020 4:52 pm
Forum: Electronics
Topic: Rocket tracker & monitoring thing
Replies: 33
Views: 3073

Re: Rocket tracker & monitoring thing

Time for an update on this, it's been too long... So Drew has been kind enough to fly the rev0.1 and rev0.2 versions of hardware, each using a variant of the MTK3339 chipset with built in patch antenna. The results have been not great for these, even for the second unit (which had GPS Uart RX connec...
by strud
Fri Oct 23, 2020 1:17 pm
Forum: Scratch Built
Topic: Avionics bay for HPV4PoC
Replies: 18
Views: 1447

Re: Avionics bay for HPV4PoC

Connected up all power to everything and SmartSwitch unit to RocTrak. Couple of solder issues with the power monitor IC and a few code tweaks and now the little webpage shows useful battery/power details http://drive.google.com/uc?export=view&id=10DSy91zf3iwNfX85ZG1DfTWaxv2fXkbJ Ch1: Has the Roc...
by strud
Tue Oct 20, 2020 7:22 pm
Forum: Higher, Faster, Further
Topic: Vertical Trajectory System (with some 3D printed parts)
Replies: 74
Views: 47714

Re: Vertical Trajectory System (with some 3D printed parts)

Hi OTT Pretty interesting project there :-) Regarding gain schedules and implementing something to give you a relatively consistent control loop response, I did implement something very much like this for a roll control system many moons back that was able to maintain the natural period and damping ...
by strud
Thu Oct 15, 2020 10:58 pm
Forum: Scratch Built
Topic: Avionics bay for HPV4PoC
Replies: 18
Views: 1447

Re: Avionics bay for HPV4PoC

Hey Ben, glad some of it might be useful... Getting close now, just a few minor things remaining such as GPS patch antenna mount and connecting up the SmartSwitchfor to the RocTrak module. A pic of each sector with ejection canon tubes removed FarTrak module (front centre), 5V boost converter (left)...
by strud
Fri Oct 09, 2020 7:46 pm
Forum: Electronics
Topic: Boost converters
Replies: 4
Views: 427

Re: Boost converters

Did find a nice alternative for mid power (say up to 1A cont) applications on the cheap. These super cheap boost converters have rather HUGE ripple with almost any load on them : https://www.aliexpress.com/item/32366166138.html?spm=a2g0s.9042311.0.0.11314c4d5nPJ1F https://ae01.alicdn.com/kf/HTB13lGM...
by strud
Fri Oct 09, 2020 6:45 pm
Forum: Scratch Built
Topic: Avionics bay for HPV4PoC
Replies: 18
Views: 1447

Re: Avionics bay for HPV4PoC

So I decided to mount the 18650 LiIon batteries this evening and came up with a pretty good compromise given the constraints. A piece of 2.4mm thick G10 was cutout such that the battery is a snug fit axially and sits with the OD of the battery is flush with the bottom of the G10. A pair of grooves a...
by strud
Fri Oct 09, 2020 12:19 pm
Forum: Electronics
Topic: Camera part 2
Replies: 2
Views: 639

Re: Camera part 2

So after Drew found these great Runcam Split versions, I went and got one myself. I now have one mounted in my 4" av bay and started digging more into their capabilities other than just recording great video. Turns out there is a nice serial interface protocol that allows full control of the ca...
by strud
Fri Oct 09, 2020 6:34 am
Forum: Scratch Built
Topic: Avionics bay for HPV4PoC
Replies: 18
Views: 1447

Re: Avionics bay for HPV4PoC

Hi Voyager The long aspect ratio 'canon' tubes allow the use of BP at high altitude and has been demonstrated to work well by numerous others. As this early pic of the av bay shows, these canon tubes run internally in my bay so there isn't any real protrusion into the rocket. http://drive.google.com...
by strud
Thu Oct 08, 2020 7:53 am
Forum: Scratch Built
Topic: Avionics bay for HPV4PoC
Replies: 18
Views: 1447

Re: Avionics bay for HPV4PoC

Machined the aluminium rails this morning and mounted the camera board etc. http://drive.google.com/uc?export=view&id=1WQ5nNJYE7FzVARiKYkpXRYX26b0J0ZYI http://drive.google.com/uc?export=view&id=15TD-jIK6jcWPHkkb5TXvVoz4XFtw4PQO http://drive.google.com/uc?export=view&id=1c140qXY61-uRnQe1B...
by strud
Wed Oct 07, 2020 9:45 pm
Forum: Scratch Built
Topic: Avionics bay for HPV4PoC
Replies: 18
Views: 1447

Re: Avionics bay for HPV4PoC

Found a bit more time and got the Runcam Split nano mount sorted. Turned out to be quite a bit more effort that expected but oh well.... Made up the mounting plate from 2.4mm G10 sheet Jig made with parallels and magnets :-) then used CA glue to tack in place prior to epoxy http://drive.google.com/u...
by strud
Sat Oct 03, 2020 8:32 am
Forum: Electronics
Topic: NanoVNA V2: An Inexpensive and Effective Vector Network Analyser
Replies: 10
Views: 361

Re: NanoVNA V2: An Inexpensive and Effective Vector Network Analyser

Hi OTT, that is a great find.

I've signed up to be notified when the seller is back so I can get me one of those!

Definitely have some RF projects where that will come in handy for sure.
by strud
Mon Sep 28, 2020 5:21 pm
Forum: Electronics
Topic: Boost converters
Replies: 4
Views: 427

Re: Boost converters

Would not use in circuits that can generate a short, however a 4A rating should enable to run devices that do drive squibs or ignitors if they have current limiting.

The 2nd iteration of the RocTrak board has 1.9A current limited smartfets hence would be happy to power that application.
by strud
Sun Sep 27, 2020 7:44 pm
Forum: Electronics
Topic: Boost converters
Replies: 4
Views: 427

Re: Boost converters

So knowing that a boost converter running from 1 or more Lithium cells is something I'm going to need going forward, I designed on up using a nice little part from Ti. http://drive.google.com/uc?export=view&id=1hiC-GYbeSPOEshv-TvmA7MVslTYRtT1l http://drive.google.com/uc?export=view&id=1CYNrK...
by strud
Fri Sep 25, 2020 8:53 am
Forum: Electronics
Topic: Boost converters
Replies: 4
Views: 427

Boost converters

I have some boards that need to run between 5 & 6V at considerable current (1A near continuous with peaks around 2A) and hence need some form of voltage regulation since no battery options are really suitable. I plan to put together a design for a boost converter to meet this requirement, but in...
by strud
Thu Sep 24, 2020 7:56 pm
Forum: How's the Weather..?
Topic: Lack of posts....
Replies: 8
Views: 675

Lack of posts....

Just thought I would try and get some feedback from the forum as to the reason for such a low volume of posts and activity in general.

Are people doing less rocketry? less interested? too miserised by Corona??? Using another forum instead????

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