A new small STM32L4 board

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FRDM4236
Posts: 2
Joined: Thu Nov 25, 2021 8:22 am

A new small STM32L4 board

Post by FRDM4236 »

Hi All,
I remember that a few years ago, there was a community effort to make a STM32F4 board in Blue Pill form factor. What is the latest information on that project?

I am thinking about making a small low power L4 board as an open source project.
Recently I made a Teensy 3.2 board smaller at 31mm x 13mm. You can download SCH, BOM and Gerber files at the following link:
https://www.pcbway.com/project/sharepro ... board.html

On the Teensy forum, someone suggested making a smaller TinyPICO. After evaluating the TinyPICO, I am sure that I can make it.
https://forum.pjrc.com/threads/68613-Mi ... x 12-98mm. I have been working on it very hard.
Is there any experienced ESP32 programmer interested in collaborating and testing it?

I think that I may be able to make something like that for the STM32L4 after I shrink the TinyPICO.
Is anyone interested ?
Thank you very much!
Happy Thanksgiving to all!
mrburnette
Posts: 633
Joined: Thu Dec 19, 2019 1:23 am
Answers: 7

Re: A new small STM32L4 board

Post by mrburnette »

FRDM4236 wrote: Thu Nov 25, 2021 8:55 am Hi All,
I remember that a few years ago, there was a community effort to make a STM32F4 board in Blue Pill form factor. What is the latest information on that project?
...
Origional thread: https://stm32duinoforum.com/forum/viewt ... _2633.html

I think some members actually made bluepill sized F4 boards, but the availability of Chinese F4xx at a reasonable price dampened the forum effort. I remember at least 1 member mailing out a few "extra" custom boards for eval. But I can not remember any large forum purchase opportunity.

https://stm32duinoforum.com/forum/viewt ... t_110.html
ag123
Posts: 1655
Joined: Thu Dec 19, 2019 5:30 am
Answers: 24

Re: A new small STM32L4 board

Post by ag123 »

it is good effort to try making a new board ;)
L4 is actually more 'advanced' than F4 as they likely have some 'extra' low power peripherals that you may not find on F4.
for some existing 'example' boards, you could take a look here
https://stm32-base.org/boards/

the PYboard for MicroPython that has been around for quite some time qualifies as a mini board
https://store.micropython.org/
then Adafruit made one as well
https://www.adafruit.com/product/4382
then some others at olimex et.al
https://www.olimex.com/Products/ARM/ST/
FRDM4236
Posts: 2
Joined: Thu Nov 25, 2021 8:22 am

Re: A new small STM32L4 board

Post by FRDM4236 »

Thanks mrburnette and ag123 for the info.
I am very sorry that I have not gotten a chance to respond, I have been working very hard to finish shrinking the TinyPICO. The PCB layout is done and I will get the assembled prototype in 2 weeks. See the link at PJRC forum: https://forum.pjrc.com/threads/68890-Sh ... e-TinyPICO

I plan to make a L452 board soon, the reason I pick up the L452 is because a university is using our trainer with the L452. Since there is not much interest in this forum, I will collaborate with them. The size of the board may be larger depending on the features they want.

I think that this forum has discussed more hardware than the PJRC forum, mainly because this is a 100% open source forum.
So I have a question to ask. In the process of making a smaller ESP32 board, I found that battery charge status LED on the TinyPICO flashes even the battery is not connected. It's a bit annoying. I would like to stop it. With a good luck I think that I have found a solution. A simple LPF works on the paper, but I have to test it on my prototype. Can any one find any reason it may fail?
https://forum.pjrc.com/threads/68945-A- ... PICO-board

Thank you very much.
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