![]() This is because the on-board regulator is essentially capable of powering only the microcontroller itself and no more than a couple of indicator LEDs. In which case, the answer is regulated 5 V. If you are asking this question, it is highly likely that you will wish to connect something else. And even then it was limited because an unloaded 9 V transformer-rectifier-capacitor supply would generally provide over 12 V which the regulator could barely handle. ![]() It is essentially only for demonstration use of the bare board back in the very beginning of the Arduino project when "9V" transformer-rectifier-capacitor power packs were common and this was a practical way to power a lone Arduino board for initial demonstration purposes. I was told this is the best way to power up the Arduino, because the VIN is regulated.Ī very real danger is that the obsolete tutorials on the Arduino site and others misleadingly imply that the largely ornamental "barrel jack" and "Vin" connections to the on-board regulator allow a usable source of 5 V power.
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