Potentiometer

Other Hardware General Electronics
1

Hi there,
With a potentiometer do the wires that provide the 5v and GND have to be connected to the arduino or can they be connected to a 5v battery pack.
Also the same question for a RC receiver, do the 5v and GND have to be connected to the arduino or can I just put the signal wire on the arduino

If the answer to both are all the wires need to be connected to the board can I put the 5v wire from the potentiometer and receiver together in one 5v output of the arduino? And same with the GND from the potentiometer and receiver?

Thanks

2

You can double up wires to the same circuit point like +5v and GND.

Normally you must connect the Arduino GND to your I/O GND.

The potentiometer and servo can have a different +5v supply from the Arduino but must have a common GND connection to the Arduino.

In fact, you should not use the +5v pin on the Arduino for those things that require relatively large amounts of current, especially motors and relays.

3

Connect the pot only to the Arduino +5V and ground, otherwise you'll get inaccurate/noisy results.

Also note that connecting to a separate supply that might be on when the Arduino is powered down would risk
damaging the Arduino.