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Hi Enzo,
Sorry for the short answer yesterday, as I was busy trying out a lot of things to figure out where the problem is.
In the meantime, I tried out a brand new MKR 1010 WiFi and a new battery (LP103454, 3.7V 2000mA), and the behaviour is still the same. I should be able to exclude an hardware fault of the MKR 1010 WiFi.
I hooked up also an external Adafruit USB LiIon/LiPoly charger to bypass the integrated one (that, to me, does not do what I would like it to do). Connecting the Adafruit module to the +5V of the Arduino board, to get the input from the same USB cable that I use to load the firmware, it happily shows the “power” LED lit at point 1/ above. When I go through the 2/ and 3/, the “power” LED remains off. That is to say, not only the integrated PMIC on MKR 1010 WiFi does not charge anymore the connected battery, but it does not even provide the +5V which, according to the MKR 1010 WiFi schematic, should be connected to VUSB. Again, very strange.
After step 3/, that is when I reconnect the board to the USB of my laptop, another strange thing is that the Arduino IDE states “not connected” on the serial monitor, while before disconnecting as in step 2/, it was happily connected.
All of the above it is because I am willing to build a 220V detector, which would send an email message to me when the 220V fails. In my summer house I have a battery powered WiFi router that keeps working also when 220V fails. As I have lost so many freezer loads because of a power fault, I want to understand when the problem occurs. I came across your library on how to send email with MKR 1010 WiFi, which works flawlessly, and I thought that on this forum I might get some ideas on how to solve the basic HW problem.
Ciao,
Paolo
