Search found 1021 matches

by strud
Wed Jul 08, 2020 1:58 pm
Forum: Electronics
Topic: Rocket tracker & monitoring thing
Replies: 17
Views: 574

Re: Rocket tracker & monitoring thing

Hi OTT, Yes the intention is to have a root/index page that has a very high level 'good to go' or 'Don't press the button' level of resolution, ie big green or big red indicator with the combination logic looking at a list of metrics and thresholds to come up with the overall result. Will be changin...
by strud
Tue Jul 07, 2020 9:00 am
Forum: Electronics
Topic: Rocket tracker & monitoring thing
Replies: 17
Views: 574

Re: Rocket tracker & monitoring thing

Have output channel continuity working now and updated Webpage to include this, along with reformatting using tables.

Image
by strud
Sun Jul 05, 2020 4:29 pm
Forum: Electronics
Topic: Rocket tracker & monitoring thing
Replies: 17
Views: 574

Re: Rocket tracker & monitoring thing

Have RocTrak board talking to the Smart Power disconnect board. Debug out showing 3 channels (3 lithium batteries connected, Ch1 powering RocTrak board) ------------------------------------------------------------------------ Read start: Voltage (mV) = 4011.230 3669.922 3948.242 Vsense (mV) = 0.175 ...
by strud
Sat Jul 04, 2020 11:07 pm
Forum: Electronics
Topic: Battery isolator
Replies: 6
Views: 367

Re: Battery isolator

So I've been playing with the 'Smart Power Switch' / 'Smart Disconnector' today and finally worked out why I couldn't get I2C comms working..... - Board error - no - soldering error - no - firmware error / config error etc - no (tested comms with another I2C sensor board and all good) - Behavior not...
by strud
Sat Jul 04, 2020 7:17 pm
Forum: Electronics
Topic: Rocket tracker & monitoring thing
Replies: 17
Views: 574

Re: Rocket tracker & monitoring thing

Hi Mat

The radio has 2 power levels, 0.5 and 1W and I could use the uC to select this as you suggest.

When I iterate the board (will need to) can see if there is a spare digital out I can use for that since the current draw is MUCH lower ie significantly less than half.
by strud
Thu Jul 02, 2020 10:58 am
Forum: Electronics
Topic: Rocket tracker & monitoring thing
Replies: 17
Views: 574

Re: Rocket tracker & monitoring thing

Good points OTT, totally agree. Not sure where the sweet spot is for Tx power on the 'bird' but I suspect over 5W might start to get difficult with induced currents in other devices although this can be mitigated with filters and shielding to some degree. Something I'd like to work on once the curre...
by strud
Thu Jul 02, 2020 12:54 am
Forum: Electronics
Topic: Rocket tracker & monitoring thing
Replies: 17
Views: 574

Re: Rocket tracker & monitoring thing

Hi AirCommand It's a fun one for me too, since it incorporates a bunch of interesting functionality. The radio within the rocket running at 1W and 2m should be capable of pretty decent range, how far exactly I'm not sure (only testing will really tell). The antenna on the ground will be very importa...
by strud
Thu Jul 02, 2020 12:05 am
Forum: Electronics
Topic: Rocket tracker & monitoring thing
Replies: 17
Views: 574

Re: Rocket tracker & monitoring thing

Got the radio module and DTMF decode working now. Basic DTMF state machine working, allowing a basic arming and command mechanism. Example command of call back with tone shown in pics below. http://drive.google.com/uc?export=view&id=1agFlhzbEUyYQVQeidRCE0ioYEpB4-iAX http://drive.google.com/uc?ex...
by strud
Tue Jun 30, 2020 2:22 pm
Forum: Electronics
Topic: Battery isolator
Replies: 6
Views: 367

Re: Battery isolator

I have the PCBs back for these now: The basic version http://drive.google.com/uc?export=view&id=13wQ74FgSy5-e3JbVGrzZO3oF6n7rfEzC http://drive.google.com/uc?export=view&id=19o-JZYhasiKWCOpPRBKnsfy_HNxMHUH- http://drive.google.com/uc?export=view&id=1vIT_4713aTyUxVKMLu4iATwF5_A3YmV4 http:/...
by strud
Sun Jun 28, 2020 11:27 pm
Forum: Electronics
Topic: Rocket tracker & monitoring thing
Replies: 17
Views: 574

Re: Rocket tracker & monitoring thing

Spent some time over the weekend resolving a few issues with the board/pin mapping conflicts with the ESP32. It mostly was caused by the odd minutiae of the ESP32 that I am now mostly understanding but obviously was not fully aware of before I sent the boards off to be made..... Anyway, there is onl...
by strud
Fri Jun 26, 2020 8:40 pm
Forum: Electronics
Topic: Rocket tracker & monitoring thing
Replies: 17
Views: 574

Re: Rocket tracker & monitoring thing

Got the boards yesterday and put one together (minus radio and buzzer) last night and this evening. Topside - GPS module topleft (Titan2), below GPS module is DTMF status leds (from left DTMF valid, bit3, bit2, bit1, bit0, arm status) To the right of these is the missing buzzer, then to the right of...
by strud
Wed Jun 24, 2020 2:24 pm
Forum: Hybrid - Crossbreeding Rocketry
Topic: Hybrid question
Replies: 5
Views: 385

Re: Hybrid question

Read slide 9 https://www.ibb.ch/publication/N2O/N2O_safety_e.pdf quote from slide 9: "• Very good solubility in oil grease and other hydrocarbons like plastics etc (That Very good solubility in oil, grease and other hydrocarbons like plastics etc. (That s' why it works so well for whipped cream...
by strud
Wed Jun 24, 2020 1:17 pm
Forum: Hybrid - Crossbreeding Rocketry
Topic: Hybrid question
Replies: 5
Views: 385

Re: Hybrid question

Hi AirCommand, I think that there would be a few issues with this approach - Safety : a premixed Ox/Fuel moves a long way away from the 'mix at time of combustion' approach normal hybrids have and may be much more prone to decomposition or similar issues - If you made a slurry, then it may not actua...
by strud
Fri Jun 19, 2020 7:07 pm
Forum: Electronics
Topic: Battery isolator
Replies: 6
Views: 367

Re: Battery isolator

Hi OTT Yes that is my plan anyway, since as stated in my previous post, the phono jack will not reach with it being recessed. I want to setup a test to see at what acceleration these contacts open, even though I expect it to be very very high. They will be aligned to open in the horizontal plane (X ...
by strud
Fri Jun 19, 2020 8:53 am
Forum: Scratch Built
Topic: Avionics bay for HPV4PoC
Replies: 7
Views: 368

Re: Avionics bay for HPV4PoC

A bit more progress. - RF (SMA) connector mounting holes in place (1/4 x 36tpi) - Attachment points started (made from 7075), eyelets still to be machined - Switch band in place, shoulders and OD machined - GPS helical and 70cm/430MHz Telemetry link antennae test fitted http://drive.google.com/uc?ex...

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