I have a general question regarding the power-supply of the electronic components, that are attached to an Arduino.
If I have a device that operates at voltages between 3,3V and 5V (e.g. this RS232 to ttl converter), what is the best way to connect it with the Arduino?
Connect 3.3V or 5V power supply between VCC and GND
I know, that you can not draw as much current out of the 3,3V Pin like on the 5V Pin. But what if I don't need much current anyways (like in the linked example)?
What ware the advantages / disadvantages of connecting it to 3.3V and 5V?