I am still new to Arduino development and I need help. Could Vin pin be a 5v output to power 5v sensors or it is dangerous to use as output source? T
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Could Vin pin be a 5v output to power 5v sensors
In a word, "no."
Vin is the barrel connector input, from before the 5V regulator. That means that if you are powering your Arduino from an external power source (rather than USB) it probably has a voltage significantly larger than 5V (and is thus not suitable for powering 5V sensors.) If you're powering the Arduino via the USB connector, then Vin is on the "wrong" side of the regulator, and is not suitable for powering 5V sensors.
The +5V pin can be used to power 5V sensors.
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