Search found 25 matches

by flyboy74para
Mon Sep 09, 2019 11:51 am
Forum: Off topic
Topic: Fourier Transform
Replies: 3
Views: 118

Re: Fourier Transform

Ok I have put up some clean code that is hopefully easy to follow. I have 2 version of the code. The first version I wrote the code to perform the discrete fourier transform (DFT). This will show the main underbelly of the magic that happens but I haven't had the time to clean it up and make it nice...
by flyboy74para
Sun Sep 08, 2019 8:25 pm
Forum: Off topic
Topic: Fourier Transform
Replies: 3
Views: 118

Re: Fourier Transform

stevestrong wrote:
Sun Sep 08, 2019 4:27 pm
Nice.
Can you share some code?
A few others have asked for the code too.

I just need to clean the code up a little then I will post it. Might even get to it today :)
by flyboy74para
Sat Sep 07, 2019 1:58 am
Forum: Off topic
Topic: Fourier Transform
Replies: 3
Views: 118

Fourier Transform

I recently discovered the Fourier series while helping my son learn calculus. I have used a 2D Fourier transform to draw out my company logo "SEQ Paragliding". Each epicycle (clock hand) turns at a constant rate never changing but using a Fourier transform I am able to calculate the needed starting ...
by flyboy74para
Thu Sep 05, 2019 6:20 am
Forum: General discussion
Topic: Bluepill - smoked!
Replies: 11
Views: 293

Re: Bluepill - smoked!

This seems to be a hard problem to deal with: the fact that most new MCUs run on 3.3v and that 1s Lithium batteries are over 4v when fully charged and below 3v when fully discharged. If you use an LDO to regulate the voltage down when the 1s Lithium is fully charged then the MCU won't run as the bat...
by flyboy74para
Sun Aug 25, 2019 8:54 pm
Forum: STM32F4 Boards
Topic: very cheap STM32F407VxT6 board with flash
Replies: 6
Views: 640

Re: very cheap STM32F407VxT6 board with flash

this is quite interesting but that i guess given the limited pin count, possibly not all the pins are routed to headers. either way it is rather low cost and hence it may still be worth it. i'm thinking they could have used a F405RG instead that would give 1M flash, But i'd guess F405RG may be slig...
by flyboy74para
Mon Aug 19, 2019 6:00 am
Forum: All other boards
Topic: Teensy 4.0 has been released
Replies: 8
Views: 489

Re: Teensy 4.0 has been released

It would be interesting to compare it to the Sipeed boards with the K210 chip https://www.seeedstudio.com/sipeed
by flyboy74para
Sat Aug 03, 2019 9:34 pm
Forum: General discussion
Topic: looking for a nice touch screen with fast SPI
Replies: 4
Views: 337

Re: looking for a nice touch screen with fast SPI

I have done a bit of playing with lots of different screens and here's a few things that I have noticed. SPI works great on low res screens, plenty fast on 160 x 128 and still quite reasonable on 302 x 240 but super laggy on higher res unless you use something like the FDTI chip on the screen https:...
by flyboy74para
Thu Jun 13, 2019 8:21 pm
Forum: General discussion
Topic: Old grumpa new to Arduino programming
Replies: 3
Views: 383

Re: Old grumpa new to Arduino programming

I think first can you define the problem. Is it that you can't upload your program to the blue pill or is it that aftre you upload to the blue pill it won't talk to your UNO??
by flyboy74para
Sun Jun 09, 2019 8:47 am
Forum: Projects
Topic: F405 & F411 versions of the BluePill
Replies: 67
Views: 4706

Re: F405 & F411 versions of the BluePill

I have done small components like 402 and QNF but I used a stencil and solder paste and placed them with a vacuum pump then heated the PCB on a hot plate. I found tweezers r too hard to place them compared to vacuum pump.
by flyboy74para
Sat Jun 08, 2019 9:34 pm
Forum: Projects
Topic: F405 & F411 versions of the BluePill
Replies: 67
Views: 4706

Re: F405 & F411 versions of the BluePill

oh boy, these parts couldn't be any closer together... this is what I have so far: Yes they can: check out my latest design with 0402 (not 0603 parts): https://i.ibb.co/hsLypd2/IMG-3016.jpg If you are interested, here is the link to the project on Hackaday.io: https://hackaday.io/project/164934-fun...