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by GonzoG
Sun Aug 09, 2020 5:27 pm
Forum: General discussion
Topic: [SOLVED] Powering STM32F1
Replies: 2
Views: 2998

Re: Powering STM32F1

1) You can use 3.3 or 5V pin to power board. 5V pin is wired with USB 5V. Voltage limit depends on voltage regulator used on board. Blue pills will work with up to 5.5V but not less than 3.8V. 3.3V pin powers MCU directly so all is in datasheet: https://www.st.com/resource/en/datasheet/stm32f103c8.p...
by GonzoG
Sun Aug 02, 2020 8:04 pm
Forum: General discussion
Topic: how to use multiple serial ports in stm32f103
Replies: 4
Views: 5313

Re: how to use multiple serial ports in stm32f103

Yes, but that's Roger Clarck's core.
by GonzoG
Sat Aug 01, 2020 8:12 am
Forum: General discussion
Topic: how to use multiple serial ports in stm32f103
Replies: 4
Views: 5313

Re: how to use multiple serial ports in stm32f103

More information would be nice...
What core, port, speed, sensor...

And to your main question:
https://github.com/stm32duino/wiki/wiki ... wareserial
by GonzoG
Sat Aug 01, 2020 7:19 am
Forum: STM32F4 based boards
Topic: USART on STM32F411 BlackPill
Replies: 12
Views: 35240

Re: USART on STM32F411 BlackPill

Those are alternate pins.
PA9 and PA10 are used with USB,
PB6 and PB7 are used with I2C1
so if you cannot use them you have 3rd pair: PA15 and PB3 but you need to change pin assignment:
https://github.com/stm32duino/wiki/wiki ... wareserial
by GonzoG
Fri Jul 31, 2020 12:29 am
Forum: General discussion
Topic: Measuring the battery with a blue pill
Replies: 5
Views: 5840

Re: Measuring the battery with a blue pill

In datasheet they say that recommended max. input resistor is 50k but with 100k you should still get good reading.
I've tested this with 3V lithium coin battery (3.157 on my mulitimeter V) and got this:

Code: Select all

1M: 
1M: 
1995 = 3.294V
100k: 
1982 = 3.168V
47k: 
1971 = 3.157V
no divider: 
3941 = 3.156V
by GonzoG
Thu Jul 30, 2020 10:50 pm
Forum: STM32F4 based boards
Topic: WEACT STM32F411CE SUPPORT AND I2c
Replies: 6
Views: 8709

Re: WEACT STM32F411CE SUPPORT AND I2c

There are only 3 I2C. By default only one is available (I2C 1). To access more you'll need to declare TwoWire objects ( eg. TwoWire Wire2(SDA_pin,SCL_pin); ) STM32duino Wiki: https://github.com/stm32duino/wiki/wiki/API#i2C Unfortunately some Arduino libraries are hard coded to "Wire" name ...
by GonzoG
Wed Jul 29, 2020 7:06 pm
Forum: General discussion
Topic: Measuring the battery with a blue pill
Replies: 5
Views: 5840

Re: Measuring the battery with a blue pill

You must have wired something wrong.
it works without any problems for me.

Check reading using 3.3V from board.

Also, if you use too high value resistors in voltage divider you'll get inaccurate reading (lower).
by GonzoG
Sat Jul 25, 2020 10:00 pm
Forum: STM32F4 based boards
Topic: F411 (and F401) bootloaders
Replies: 34
Views: 211821

Re: F411 (and F401) bootloaders

Does it work with Arduino IDE ??
by GonzoG
Sun Jul 19, 2020 11:15 am
Forum: STM32F4 based boards
Topic: F411 (and F401) bootloaders
Replies: 34
Views: 211821

Re: F411 (and F401) bootloaders

Their (WeAct) bootloaders do not work with Arduino and stm core.
HID bootloader upload searches for device 1209:BEBA and WeAct set their to 0483:572a
by GonzoG
Sun Jul 19, 2020 10:48 am
Forum: STM32F4 based boards
Topic: libmaple F401 pill board gives usb-serial speeds almost 1.2Mbps
Replies: 3
Views: 5386

Re: libmaple F401 pill board gives usb-serial speeds almost 1.2Mbps

I get speed up to 5-6 Mbps on F103 blue pill and 1.7Mbps on Arduino Nano (serial speed set to 2Mbps) so 1.2 Mbps for F401 isn't even fast.

There is no baud rate for USB. You can put "Serial.begin(1);" in code and it still will work as fast as possible.

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