tiny stm32 F4 boards

Limited support for STM32F4 Discovery, Nucleo and custom F4 boards
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Squonk42
Posts: 69
Joined: Thu Dec 29, 2016 9:25 am
Location: Bordeaux, France

Re: tiny stm32 F4 boards

Post by Squonk42 » Thu Apr 27, 2017 11:43 am

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.

aster
Posts: 93
Joined: Thu Mar 30, 2017 2:41 pm
Location: bella italy
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Re: tiny stm32 F4 boards

Post by aster » Sun Apr 30, 2017 9:23 pm

yet another F407VG, but this time with a "funny" color

https://www.aliexpress.com/item/STM32F4 ... 97307.html

Ollie
Posts: 183
Joined: Thu Feb 25, 2016 7:27 pm

Re: tiny stm32 F4 boards

Post by Ollie » Sun Apr 30, 2017 10:45 pm

I did order this special red F407 on April 17. The tracking indicates that it is still in sorting center in Guangzhou :(

palmerr
Posts: 58
Joined: Tue Jan 31, 2017 6:21 am
Location: Melbourne, Australia

Re: tiny stm32 F4 boards

Post by palmerr » Sun Apr 30, 2017 11:28 pm

the 407VG is pretty cool and the price isn't too bad.

Like the quadcopter controllers in size, but without the special headers.

Not too many pre-dedicated pins either.

There is plenty of good support now for F4s - each of the streams has different features available (for now). E.g. DanielEff's has FPU, the others haven't enabled it yet (as of last week)...

Do you have a first project in mind?


ag123
Posts: 711
Joined: Thu Jul 21, 2016 4:24 pm

Re: tiny stm32 F4 boards

Post by ag123 » Mon May 01, 2017 11:23 am

found yet another board
http://www.ebay.com/itm/STM32F407VGT6-A ... 2355411407
but i'm wondering if 'hard wiring' boot0, boot1 with a dip switch is after all a 'good thing', if one wants to use that for another purpose, one may need to remove the dip switch

ag123
Posts: 711
Joined: Thu Jul 21, 2016 4:24 pm

Re: tiny stm32 F4 boards

Post by ag123 » Mon May 01, 2017 2:31 pm

found something interesting, this web seem to be a source of the blue pill
note that these webs are in chinese
https://vcc-gnd.world.taobao.com/
http://www.vcc-gnd.com/

saw this couldn't resist & grabbed a piece, 4cmx5cm and the monster number of pins, my guess is this is as much as you can squeeze on the board for the stm32f407vet6 with possibly all the pins broken out :lol:
http://www.ebay.com/itm/Mini-core-board ... 2309828654
note this web is in chinese, the photos is pretty much self descriptive
https://world.taobao.com/item/523361737 ... 4.2.0ECYor
--
just bought this new mini f4 board bought on impulse
after i click buy i looked closer at the board photos, they use ceramic resonator rather than crystal oscillator, not sure whether to regret about it :lol:
ceremic resonator has been known to 'mess up the RTC' poor timekeeping, poor frequency stability vs crystal
https://forum.arduino.cc/index.php?topic=60662.0
http://forum.arduino.cc/index.php?topic=69316.15

unfortunately, this is as mini a f407vet board as i can find for now and one which is decently well build (and not too high priced). u'd only need to look at the monster number of pins on the headers, that's possibly as little area to put all that headers breaking out all the pins :lol:

michael_l
Posts: 336
Joined: Mon Aug 24, 2015 6:11 pm

Re: tiny stm32 F4 boards

Post by michael_l » Mon May 01, 2017 6:57 pm

ag123 wrote:found something interesting, this web seem to be a source of the blue pill
note that these webs are in chinese
https://vcc-gnd.world.taobao.com/
http://www.vcc-gnd.com/

saw this couldn't resist & grabbed a piece, 4cmx5cm and the monster number of pins, my guess is this is as much as you can squeeze on the board for the stm32f407vet6 with possibly all the pins broken out :lol:
http://www.ebay.com/itm/Mini-core-board ... 2309828654
note this web is in chinese, the photos is pretty much self descriptive
https://world.taobao.com/item/523361737 ... 4.2.0ECYor
Looks nice and compact. Interesting thing is that it has a 25Mhz oscillator if I read the description right.

ag123
Posts: 711
Joined: Thu Jul 21, 2016 4:24 pm

Re: tiny stm32 F4 boards

Post by ag123 » Mon May 01, 2017 7:00 pm

that 25mhz oscillator is a ceramic resonator, the 32768 hz RTC oscillator beside it is a ceremic resonator as well corrections
https://en.wikipedia.org/wiki/Ceramic_resonator
but i'd think that'd at least beat a simple RC oscillator in terms of frequency-voltage sensitivity
RC oscillators are possibly even more sensitive to voltage swings and temperature swings vs a ceramic resonator

-----
my goof NX5032GA seemed to be a smd crystal, rather than ceramic resonator
http://www.ndk.com/images/products/cata ... SU-2_e.pdf
it seemed the 'epson' 32768khz part is also an smd crystal just that i'm not sure what is the part number for it
i'd guess a little more research is needed about these smt crystals
they seem to be some sort of mems 'tuning fork' oscillators
https://www.digikey.com/en/product-high ... z-crystals

michael_l
Posts: 336
Joined: Mon Aug 24, 2015 6:11 pm

Re: tiny stm32 F4 boards

Post by michael_l » Mon May 01, 2017 8:08 pm

ag123 wrote:that 25mhz oscillator is a ceramic resonator, the 32768 hz RTC oscillator beside it is a ceremic resonator as well corrections
https://en.wikipedia.org/wiki/Ceramic_resonator
but i'd think that'd at least beat a simple RC oscillator in terms of frequency-voltage sensitivity
RC oscillators are possibly even more sensitive to voltage swings and temperature swings vs a ceramic resonator

-----
my goof NX5032GA seemed to be a smd crystal, rather than ceramic resonator
http://www.ndk.com/images/products/cata ... SU-2_e.pdf
it seemed the 'epson' 32768khz part is also an smd crystal just that i'm not sure what is the part number for it
i'd guess a little more research is needed about these smt crystals
Yes, I believe for average user like me either one will do just fine.

Not tiny but quite interesting from the same seller: 512MB NAND Flash and 256Mb SDRAM! And as a bonus 256Mb SPI Flash included :-) https://world.taobao.com/item/544433769 ... 8.8.3U73zp

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