Hallo Arduino friends, I'm quite a newbie in the microcontrollers world, so please forgive my ignorance. It is not lazyness, simply a lot of confusion and I still need to put order in my mind.
I'm designing my project and PCB based on the Wemos S3 Mini.
My design is using 5V source that I feed in the VBUS pin of the S3 Mini (not using the USB connector).
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I would like to protect my computer USB port in case I connect the USB cable to program the microcontroller while it is powered with the external 5v source. I was thinking to add an additional USB connector to my PCB with the 5v rail protected by a diode, but in that case I will not have any way to connect the data pins of the USB port. Any suggestion? Maybe a data only USB cable with the 5v wire not connected?
Also regarding the diode, I have no idea which diode, what specs and so on... Can you please help me identify the right one for my use case? -
I have a component that works at 3.3v that requires less than 1 mA. Can I use the 3.3v port on the S3 Mini to power the component?
All the other components are powered by the external 5v and work fine with the 3.3v level of the microcontroller.
Here is the link of the board: S3 MINI — WEMOS documentation
Thank you very much!
Francesco