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xisco · 2023-11-12

Hello,I have a NUCLEO-F446RE board, lots of homemade boards with little MCUs (STM32G030F6, STM32F103C6, ...), some blue pills and programmers. Only the first ones I bought has an original chip. The other blue pills and programmers, the vendor lies an...

xisco · 2023-10-15

Hello,When I plug this board to my computer, appears a removable disk of 1,6 MB capacity.Is this disk accessible from the MCU? For store small data, or make a dataloggerWhere the filesystem is stored? Neither the STM32F446RE nor STM32F103CB of the ST...

xisco · 2023-09-15

Hello,I will make some probes for reading electrical values (AC, Analog, digital,...), but I'm not sure what happens if I insert a signal to a GPIO when MCU is powered off.I read time ago that all GPIOs are in high impedance state when MCU is not pow...

xisco · 2023-07-16

Hello,I made a project using a blue pill. It works when is powered through st-link (3,3V).When I power this board from two AA batteries (~3V), the board does nothing until I press the reset button.An STM32F103 should work from 2 to 3,6 V, according t...

xisco · 2023-10-29

If you use a blue pill, I assume that you use a protoboard or dupont cables.In the two cases, there is a high risk of bad connections, and it seems that resistor R1 or ground has a problem on its connections, leaving PA0-WKUP on an indeterminate stat...

xisco · 2023-09-18

You shorted 3.3V to GND. Those capacitors are of low capacity, and the probability of a fail of one of them for this cause is very low.I think it's more probable that the problem is in the 5V to 3.3V regulator.You can test separating the regulator to...

xisco · 2023-09-18

Yes, it looks like a zener diode in series with a rectifier diode to avoid the forward polarization current of the zener diode.

xisco · 2023-09-17

I tested now a STM32G030 and a STM32F103 using a multimeter on diode test position.All GPIO of STM32G030 are FT and I don't find the protection diode from any pin to VDD. Obvious, if this diode were present, will be impossible to input a voltage >VDD...

xisco · 2023-09-16

Thanks for your answerFor analog inputs, I will reduce the maximum current to less than 1 mA, avoiding loss of accuracy in galvanic isolation.For digital inputs, I will use optocouplers.

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Flash drive in Nucleo-F446RE

Input signal when MCU is powered off

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Re: Input signal when MCU is powered off

Re: Input signal when MCU is powered off

Re: Input signal when MCU is powered off