I have a servo that has an operating voltage of 6-8.4V. Can I control this servo using an Arduino Uno? And if so: do I need to supply the voltage seperately and just connect the signal wire to the Arduino?
Almost ALL servos need a separate PSU which should also have a common ground.
Using the power from the board may produce unpredictable results including but not limited to the boards death.
That makes sense, thanks for linking the explanation.
However, this only applies when I have different voltages, right? Because I already used setups, where I only used one digital output pin of the Arduino and used GND of my breadboard PSU. So the circuit was not closed from the Arduino's point of view and it still worked just fine.
That could simply be a GROUND LOOP effect.
Without a schematic of that circuit it would be hard to tell.
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One may find that the jittering servo issue may be from the breadboard's limited capacity to carry current. I mention this cause you'll run into it. Supplying power to servo's through a breadboard is not going to work all that well.
As long as the Arduino gnd and the servo power supply gnd's are connected, you'll do fine with the signal wire. I run 3.3V signal wire to MG servos running on 5V. One servo has been working this way for 3 years, 24/7.
Good luck on making your 6V multi amp power supply for the servos. If you use off the shelf adjustable switching regulators for a servo supply, give the supply a good filter capacitor.
A 4X AA battery pack will run 1-2 small servos. Don't forget to connect the servo/battery negative/Arduino ground together.
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