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 » Tue Jan 16, 2018 9:06 pm

It is probably the best if the people discuss a little bit about the importance of exchanging the SD-card.
Here is how Paul Stoffregen made it with the teensy 3.6.

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Squonk42
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Re: F405 & F411 versions of the BluePill

Post by Squonk42 » Tue Jan 16, 2018 10:23 pm

It is difficult to compare the 2 boards: the Teensy 3.6 is a 4-layer board @ $30, we want a 2-layer board @ $5~10.

Just the SD Card connector on the Teensy is $1.90, our connector is $0.30, although not a fancy push/push type.

Anyway, it is not possible to move the SD Card connector on the other side of our board while keeping the original Bluepill pinout compatibility as we have the SWD header on this side.

We are left to leaving the SD Card in its position, either 1) with the same orientation and card removed "under the belly" which is not possible when mounted on a breadboard, 2) turned 180° but then you have to disconnect the USB plug in order to remove the card, 3) flip the whole board upside down with "above the belly" orientation, but then we need to put the buttons and LEDs on the opposite PCB side, and the micro USB connector will be reversed.

I spent 2 hours to turn the SD Card connector 180°, and I have 2 unrouted wires left (SDIO_D3 pull-down and PB12 signal), so solution 2) may be possible, although not easy...
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BennehBoy
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Re: F405 & F411 versions of the BluePill

Post by BennehBoy » Wed Jan 17, 2018 8:17 am

I'd say go with the current design in order to meet CNY. People can then gauge just how annoying/not the SD placement is whilst a v2 board is worked up.

I'm also interested in grabbing some of these - if they come built :D
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racemaniac
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Re: F405 & F411 versions of the BluePill

Post by racemaniac » Wed Jan 17, 2018 9:03 am

same here, sd card position is ok for me

victor_pv
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Re: F405 & F411 versions of the BluePill

Post by victor_pv » Wed Jan 17, 2018 3:52 pm

If you can fit the SDCard pointing out, I think it will be a bit more useful if the card is plugged in something, so doesn't have to be pulled out.
That said, if that's not possible, I don't think it's a major issue to go ahead with our first rev with the card in the original position.

There have been a few people besides Roger that registered to allpcb with the link I posted, so even thought the cost with allpcb went significantly up, we still can get a good bunch of free boards with the credit.

zmemw16
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Re: F405 & F411 versions of the BluePill

Post by zmemw16 » Wed Jan 17, 2018 3:57 pm

racemaniac wrote:
Wed Jan 17, 2018 9:03 am
same here, sd card position is ok for me
+1 or +3
stephen

victor_pv
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Re: F405 & F411 versions of the BluePill

Post by victor_pv » Wed Jan 17, 2018 4:10 pm

Squonk42 wrote:
Tue Jan 16, 2018 1:00 pm
It looks like the board dimensions are too small for www.allpcb.com to do V-cuts, but they accept tab routing and they propose to do it themselves for free, resulting in a total cost including 24h lead time and TNT shipping to France (3-5 days) for 40 pieces @ $20 (60 pieces are only @ $23 !?!). Unfortunately at this price, the boards will be green, not blue, this adds $8 more :)
When I do a quote on their system, if I select v-routing for 60 pieces, panel by ALLPCB (so we provide gerbers for a single board and they panelize it), get a quote of $26.
I am setting the dimensions to 16x64 similar to the blue pill.

EDIT: If I just select 60 individual boards, no panel, comes up as $19. Since these are not for industrial production, I would think having the individual boards from the start is just the same as much effort to assemble and reflow as DIY as having them panelized, or anyone sees an advantage on having the panel?

Also, any change to the components in this post?
viewtopic.php?f=19&t=2633&start=360#p37849
Perhaps we should edit Roger's first post to add the links.

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Pito
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Re: F405 & F411 versions of the BluePill

Post by Pito » Wed Jan 17, 2018 5:23 pm

or anyone sees an advantage on having the panel?
They do not provide Vcut within a panel when the individual board is less than 80x80mm.. (do select "Panel Separating Way:")
So the only option is, for example, to buy Single PCB, 60pcs 64x16mm, $19 as of today.
PS: It seems they are steadily increasing the prices, 100x100 5pcs $23 today.. :(

@Squonk42: the big blue traces loop in the middle.. would it work?
Pukao Hats Cleaning Services Ltd.

victor_pv
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Re: F405 & F411 versions of the BluePill

Post by victor_pv » Wed Jan 17, 2018 6:48 pm

Pito wrote:
Wed Jan 17, 2018 5:23 pm
or anyone sees an advantage on having the panel?
They do not provide Vcut within a panel when the individual board is less than 80x80mm.. (do select "Panel Separating Way:")
So the only option is, for example, to buy Single PCB, 60pcs 64x16mm, $19 as of today.
PS: It seems they are steadily increasing the prices, 100x100 5pcs $23 today.. :(

@Squonk42: the big blue traces loop in the middle.. would it work?
You are right about the price increase for 100x100.
About the v-cut, I have no problem selecting it when I select a board that's 16x64 and set the panel as 6x2, so 6 boards wide (96mm) and 2 high (128mm).
You can't have vcuts if the whole panel is smaller than 80x80, but the individual boards being smaller is fine as long as the whole panel is larger.

Comparing in PCB shopper for 100x100 5 or 10 pieces EasyEDA is cheaper while also shipping with DHL.
Anyway we have some free credit for AllPCB, still nothing can't beat free ;)

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Squonk42
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Re: F405 & F411 versions of the BluePill

Post by Squonk42 » Wed Jan 17, 2018 8:55 pm

Pito wrote:
Wed Jan 17, 2018 5:23 pm
or anyone sees an advantage on having the panel?
They do not provide Vcut within a panel when the individual board is less than 80x80mm.. (do select "Panel Separating Way:")
So the only option is, for example, to buy Single PCB, 60pcs 64x16mm, $19 as of today.
PS: It seems they are steadily increasing the prices, 100x100 5pcs $23 today.. :(

@Squonk42: the big blue traces loop in the middle.. would it work?
Funny, if you enter Qty 60 from radio buttons, you get $19, but when you enter it in the text field and submit, you get $20 :shock:

Where did you get the 64x16mm dimensions from? The actual PCB size is 53.34 mm x 22.86 mm.

OK, here is the selection:
allpcb_order_form.png
allpcb_order_form.png (206.82 KiB) Viewed 127 times
I think it could be nice to have BluePill boards that are actually... Blue! But this adds $8 to the bill.

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