Hello,.
I have a question about the UNO-R4.
What else does his microcontroller bring compared to that of the Zero?
If it really mattered, you would look it up yourself.
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5 V logic level
Thanks
If 5 V is useful for some, it goes against the grain of technology, where the supply voltage only decreases. 3.3 V is becoming widespread and 2.5 V is for to morrow.
This is due to the fact that to increase the speed of the electronics, you have to engrave finer and finer to decrease parasitic capacitors.
The consequence is that the supply voltage must be reduced, for example to avoid electric arcs on the chips.
As 3.3 V becomes more widespread, a 3.3 V microcontroller is an advantage for me.
I can understand that some prefer to use 5V, but Arduino should have given the user the option of choosing 5 V or 3.3 V.
The format falsely called UNO is that of the first board in 2005 with an RS-232 interface.
See : https://docs.arduino.cc/retired/boards/arduino-serial
This format is a repellent for me. This of the MKR is very much higher.
It is true that Arduino company must make money to continue to exist.
We do not know the outcome of the negotiations between Arduino and Microchip and Arduino and Renesas.
My impression is that Arduino is leaving Microchip.
Many thanks for your very useful response!
Until the response from @Juraj I only had this element of response:
I understood the financial motivations well, Arduino company must make money to continue to exist.
I was looking for technical explanations
One more time thanks.
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