Search found 57 matches

by Squonk42
Sat May 13, 2017 7:25 am
Forum: Postbag
Topic: Andy's Postbag and random ebay links
Replies: 67
Views: 1486

Re: Andy's Postbag and random ebay links

there are tons of touch panels for the modern smart phones hi-tech capacitive (multi) touch often with the controller http://www.ebay.com/sch/i.html?_odkw=4+wire+touch+panel&_sop=15&_osacat=0&_from=R40&_nkw=+touch+panel&_sacat=0 the only trouble is that often a google search for...
by Squonk42
Thu Apr 27, 2017 11:43 am
Forum: STM32F4 Boards
Topic: tiny stm32 F4 boards
Replies: 72
Views: 1664

Re: tiny stm32 F4 boards

michael_l wrote:This seems small enough.. https://shop.mikroe.com/development-boa ... ni/stm32f4

Yes, but quite expensive. And the choice of mini USB connector vs. microUSB is strange.
by Squonk42
Mon Apr 24, 2017 2:28 pm
Forum: Projects
Topic: WANTED - blue pill schematics and board files
Replies: 7
Views: 266

Re: WANTED - blue pill schematics and board files

It is in Altium PCB format, but it is only contains the silkscreen and mechanical layers, no traces!
by Squonk42
Tue Mar 28, 2017 4:57 am
Forum: Projects
Topic: 9 DoF Motion Sensor Fusion
Replies: 1
Views: 178

9 DoF Motion Sensor Fusion

I wrote a blog post on the subject of motion sensor fusion. As it deals with Arduino libraries and complex embedded computation, I think that the STM32Duino makes a perfect platform for this kind of stuff and that it would be worth for some readers in this forum. Here is the link to my post: http://...
by Squonk42
Thu Mar 23, 2017 10:07 pm
Forum: Off topic
Topic: IoT and Sigfox
Replies: 1
Views: 131

Re: IoT and Sigfox

Yes, I work for Telecom Design -TDnext), manufacturer of the first and most used Sigfox modems:
http://rfmodules.td-next.com/
by Squonk42
Tue Mar 21, 2017 5:51 am
Forum: Off topic
Topic: Learning about 433 MHz radios - how?
Replies: 20
Views: 520

Re: Learning about 433 MHz radios - how?

Ok, sorry for the confusion, the SX1232 is the one I am most familiar with, and the original intend was not'to compare it to the RFM69 in particular. BTW, it looks like other RFM chips are also re-packaged Semtech chips, but those seems to be "accepted" copies, as Semtech is listing Hoperf...
by Squonk42
Mon Mar 20, 2017 9:34 pm
Forum: Off topic
Topic: Learning about 433 MHz radios - how?
Replies: 20
Views: 520

Re: Learning about 433 MHz radios - how?

There are some differencies in the chips too. Like SX1231H has restriction Fdev + (BR/2) <= 250 kHz, but for RFM69 it must be less than 500kHz Also for SX1231H: Note no constraint applies to the modulation index of the transmitter, but the frequency deviation must be set between 600 Hz and 200 kHz ...
by Squonk42
Sun Mar 19, 2017 3:58 pm
Forum: Off topic
Topic: Learning about 433 MHz radios - how?
Replies: 20
Views: 520

Re: Learning about 433 MHz radios - how?

It looks like RFM69s are just (legal?) repackaged SX1231H chips: https://lowpowerlab.com/forum/rf-range-antennas-rfm69-library/rfm69-hoperf-are-they-semtech-clones-or-not/ They copied a large part of Semtech's datasheet, that's why it looks very similar. But the section 3 in the Semtech datasheet is...
by Squonk42
Fri Mar 17, 2017 11:07 pm
Forum: Off topic
Topic: Learning about 433 MHz radios - how?
Replies: 20
Views: 520

Re: Learning about 433 MHz radios - how?

Search for the ARRL (American Radio Relay League) Handbook in PDF.

Another good source for understanding modern RF transceivers can be found in some Semtech RF chip datasheets, such as the SX1232 (http://www.semtech.com/images/datasheet ... df#page=18, look at section 3).
by Squonk42
Mon Mar 06, 2017 5:18 pm
Forum: General discussion
Topic: Copying stm32 chip
Replies: 18
Views: 352

Re: Copying stm32 chip

As for read protection, i didnt even know that was a thing... Good to be aware of it. So i can lock down some of my stuff if i decide to sell it so it doesnt get cloned by some Chinese factory :p Which is funny as Ill be getting a chinese factory to mass produce things if I did that :p I wouldn't c...

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