The Arduino Nano 33 IoT is one of the 3.3 V variants of the Arduino Nano family. In the desktop Arduino IDE, you have to select the right board type, processor, and port if you want to upload sketches to the Arduino Nano. Selecting the right board type and processor/bootloader The advantage of the Arduino Web Editor is that you don’t need to install anything and your sketches are stored in the cloud. The easiest way to program the Arduino Nano is with the Arduino IDE or the Arduino Web Editor. If you connect multiple voltage sources, the power source is automatically selected to the highest voltage source. If you want to power the board in this way, you have to make sure that the voltage level is stable and does not exceed 5 V. However, this is method is not recommended because it bypasses the voltage regulators. +5V pin: It is also possible to use a 5 V external regulated power supply connected to the +5V pin (pin 27).This pin can also be used to power the microcontroller with a battery for example. VIN pin: You can also power the Arduino Nano with an unregulated 6 – 20 V external power supply connected to the VIN pin (pin 30).This cable is also used to program the Arduino Nano. You can use a Mini-B USB cable connected to the USB port of your laptop, PC, or 5 V USB power adapter. Mini-B USB connector: The most popular way to power the Arduino Nano board is with a USB cable.
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