Hello everyone ! May be a weird question, but i tried to connect a 5v source to the 5v pin (and a gnd pin) on a nano, and then measured the voltage at the 3v3 pin. It gives a solid 3.30V. Is it supposed to be so ? Is it a reliable method to power modules from the 3v3 pin ?
Sort of. 5V powers both the microprocessor and the USB interface. The chip which performs the USB interface has a built-in 3.3V regulator which provides the 3.3V you're measuring. Depending upon which Arduino Nano you have, the 3.3V source has a different current rating. The clones which have the CH340 series chip can provide less current than the FT-series genuine Nanos.
Keep a copy of the Nano schematic handy, you'll get used to referencing it:
Thanks a lot 
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