I am new to Arduino and electronics so please correct me if I made a mistake.
Many sensors and actuators require 5V. The Lolin NodeMCU V3 has outputs of 3.3V. I want to have them working together.
I have read that the VIN pin outputs the voltage of the USB power source, which is around 5V. I bet that many sensors and actuators can be connected to VIN.
I guess that the main difference with the VCC pin of other boards is the accuracy and stability of the potential.
1) What about the amperage? (I guess that the max amperage of the USB power supply is divided between the board and sensors/actuators connected). How does it compare with the VCC output of, let say, an Arduino UNO?
2) How important is in most practical cases not having exactly 5V? (clearly, I am not considering using the sensors for extremely accurate measurements). I am interested in things like movements/distance/light/accelerometers/humidity etc. sensors and LCD displays, relays, small motors, etc..
I have seen that many sensors have a not so narrow range of working voltages. That makes me think that small oscillations in the USB voltage may not be significant.
3) Is there a better yet simple way to connect 5V devices to this board?
Thank you in advance.