Search found 651 matches

by racemaniac
Tue Jan 16, 2018 7:17 am
Forum: Projects
Topic: F405 & F411 versions of the BluePill
Replies: 596
Views: 11146

Re: F405 & F411 versions of the BluePill

i'm sticking to my opinion of starting out with the current iteration, and having a look at how it performs ^^

i think we're now at a point where it is interesting to order a few boards and build a few prototypes? :)
by racemaniac
Sun Jan 14, 2018 4:56 pm
Forum: General discussion
Topic: nrf24 / esp8266 /xbee section ?
Replies: 8
Views: 132

Re: nrf24 / esp8266 /xbee section ?

lol, the collective ignoring of the actual topic :p

i am in favor for such a section :). Would love to know of xbee etc... compatible modules we can use and where to find them.
by racemaniac
Sun Jan 14, 2018 12:09 pm
Forum: Projects
Topic: F405 & F411 versions of the BluePill
Replies: 596
Views: 11146

Re: F405 & F411 versions of the BluePill

Another option is to have the current bottom the new top.. Sdcard will stay as-is, but leds and buttons have to be placed on the new top.. That could be easy as there is nothing beneath the leds and buttons currently.. Like Maple Mini did.. You must not see the chip, and you will get more place for...
by racemaniac
Sun Jan 14, 2018 11:28 am
Forum: Projects
Topic: F405 & F411 versions of the BluePill
Replies: 596
Views: 11146

Re: F405 & F411 versions of the BluePill

don't think it'll be possible to turn it around.
when making my own boards i'm always doubting between both options. Having it easily reachable during development is nice. When building it into something it however is nice to have the sd card nicely protected on the belly of the board :)
by racemaniac
Sun Jan 14, 2018 8:43 am
Forum: Projects
Topic: F405 & F411 versions of the BluePill
Replies: 596
Views: 11146

Re: F405 & F411 versions of the BluePill

I pushed a new version of the BluePill F4 board with the following features: Main thing: I added a LiPo battery charger as an option on the bottom of the board below the SWD connector. It uses the same MCP73812T-420I/OT and ideal diode made up of a PMOS FET transistor and a Schottky diode as Olimex...
by racemaniac
Wed Jan 10, 2018 8:23 am
Forum: Projects
Topic: F405 & F411 versions of the BluePill
Replies: 596
Views: 11146

Re: F405 & F411 versions of the BluePill

:idea: Can you reuse the Vcc/Gnd pins from the SWD header for the battery as well :?: a) You do not need battery connected when doing programming via SWD.. b) You may not need Vcc connected on the Vcc pin while programming.. Yes! So, I added a 0R between the SWD +3.3V pin (now +VBAT) and the +3.3V ...
by racemaniac
Sat Jan 06, 2018 9:44 am
Forum: Projects
Topic: F405 & F411 versions of the BluePill
Replies: 596
Views: 11146

Re: F405 & F411 versions of the BluePill

No problem, the more pairs of eyes, the better! I agree on the first remark. On the second one, "apart" is a relative concept, especially on this tiny board :) I am thinking or removing the "CLC" solution to keep only the AP212 (with AGND). What do you think? On another subject, I think it is very ...
by racemaniac
Sat Jan 06, 2018 7:14 am
Forum: Projects
Topic: F405 & F411 versions of the BluePill
Replies: 596
Views: 11146

Re: F405 & F411 versions of the BluePill

Ok, did another check of the board, 2 more remarks XD (nothing will escape my eye :p ) - the gnd of ap2112k should be connected to agnd, not gnd - your alternative to the seperate voltage regulator doesn't match what you described in your post: http://www.stm32duino.com/download/file.php?id=2201 the...
by racemaniac
Fri Jan 05, 2018 8:41 am
Forum: Off topic
Topic: Meltdown and Spectre - Cortex M3 M4 not affected
Replies: 3
Views: 296

Re: Meltdown and Spectre - Cortex M3 M4 not affected

i think it's more that we usually don't have seperate kernel memory, and we're not going fast enough to need out of order/speculative execution, etc XD.
by racemaniac
Tue Jan 02, 2018 9:52 am
Forum: Off topic
Topic: 5$ free shipping 10x10cm 2-layer PCB (5pcs)
Replies: 15
Views: 471

Re: 5$ free shipping 10x10cm 2-layer PCB (5pcs)

staticmem wrote:
Fri Dec 29, 2017 1:37 pm
They are now $20 for 10 but still free DHL freight.
Are you sure? when going to the site i still see them @5€, or does the price increase once you try to check out?