The very popular Low-Power library is supporting the SAMD21G but only after making some patching. Indeed, most of the power are drain while the microcontroller is doing nothing (i.e. The common way to save power with microcontroller is to go to sleep and use the watchdog to wakeup. How to save power with the Arduino Nano 33 IoT? If you don't power the board through the USB jack, you will stay with 0V on this pin. Notice that you cannot supply power to the board through this pin, it is only to have a handy 5V for your external components powered by the USB. To to that, you just have to solder the VUSB jumper on the board. If you need 5V for your project and you supply power through USB, you can connect the VUSB jumper to enable 5V power supply on the VUSB pin. The Arduino Nano 33 IoT has a 5V pin which is not wired by default. How to enable the 5V pin on the Arduino Nano 33 IoT?
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