F405 & F411 versions of the BluePill

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ChrisMicro
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Re: F405 & F411 versions of the BluePill

Post by ChrisMicro » Sun Jan 14, 2018 9:24 am

Your design looks very nice. Probably it would be useful if the SD-Card Holder would be turned by 180°. It could be easier for a user to exchange the SD-card when the board is built in a housing.

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Pito
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Re: F405 & F411 versions of the BluePill

Post by Pito » Sun Jan 14, 2018 10:56 am

It could be easier for a user to exchange the SD-card when the board is built in a housing.
Yea, imagine this board is pressed into a solderless-breadboard (for example), and usually with a significant force.. Messing with the sdcard would be a pain..
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racemaniac
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Re: F405 & F411 versions of the BluePill

Post by racemaniac » Sun Jan 14, 2018 11:28 am

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 :)

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Pito
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Re: F405 & F411 versions of the BluePill

Post by Pito » Sun Jan 14, 2018 11:54 am

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 silk screen messages and logos :)

PS: the PC1-PC7 will become better accessible too. The Q is the usb socket - it could stay as-is, if you ask me.. :)
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Squonk42
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Re: F405 & F411 versions of the BluePill

Post by Squonk42 » Sun Jan 14, 2018 12:05 pm

racemaniac wrote:
Sun Jan 14, 2018 8:43 am
niiiice XD
one tiny remark though: there's a silk screen line going trough the pc7 pad :) (although when plotting the gerbers, you can substract it from the silk screen :) ).
Fixed:

Image

racemaniac
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Re: F405 & F411 versions of the BluePill

Post by racemaniac » Sun Jan 14, 2018 12:09 pm

Pito wrote:
Sun Jan 14, 2018 11:54 am
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 silk screen messages and logos :)

PS: the PC1-PC7 will become better accessible too. The Q is the usb socket - it could stay as-is, if you ask me.. :)
that would then break the point of the basic items of the board (the bluepill compatible part) all being on 1 side

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Pito
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Re: F405 & F411 versions of the BluePill

Post by Pito » Sun Jan 14, 2018 12:15 pm

Then the option+1 is to have ready pads for buttons and leds on the bottom as well, when you decide to have current bottom the new top :) I've been becoming convinced it would be a good move :).. But it is up to you..
PS: you have to add the SWD header pins description on the bottom then..
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Squonk42
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Re: F405 & F411 versions of the BluePill

Post by Squonk42 » Sun Jan 14, 2018 1:28 pm

ChrisMicro wrote:
Sun Jan 14, 2018 9:24 am
Your design looks very nice. Probably it would be useful if the SD-Card Holder would be turned by 180°. It could be easier for a user to exchange the SD-card when the board is built in a housing.
At one point in time, I had the SDCard turned 180°, but I figured out it would not be easy to access it anyway, since the micro-USB plug probably be in the way. And this is no fancy push-push SDCard holder...

But I may be wrong. If this is the case, there is a nice puzzle to solve when reordering the traces below the STM32 :geek:

EDIT: below you can see what I mean (I just put the SDCard holder on an original BluePill):

Image

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Squonk42
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Re: F405 & F411 versions of the BluePill

Post by Squonk42 » Sun Jan 14, 2018 9:44 pm

Please note that the same PCB is still compatible with an STM32F103Rx, i.e. all STM32F103 in LQFP64 package.

With this MCU, the micro USB connector, a (larger but beefier) LDO, 2x (smaller) crystals, 2x buttons (vs. 1x, lower profile), 2x LEDs, the SWD header, 1 additional Schottky diode, 13 resistors (vs. 8), 15 capacitors (vs. 13), 2 inductors (vs. none) and no cumbersome jumper block, this should be in the same $2~$3 ballpark as the original BluePill, but with more buttons for reset, boot selection and custom application usage, a correct USB pull-up resistor, a VUSB/+5V reverse current diode protection and more power... All with a lower profile (flat bottom), as the tallest part besides the SWD header are the LDO and the micro USB connector (< 2 mm). EDIT: and better analog supply too!

Here is the new "BluePill F1":

Image
Image
Last edited by Squonk42 on Sun Jan 14, 2018 10:23 pm, edited 2 times in total.

stevestrong
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Re: F405 & F411 versions of the BluePill

Post by stevestrong » Sun Jan 14, 2018 9:55 pm

GOOD JOB! - thumb up -

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