I’m fairly new to this and I can’t figure out which battery to use to power an arduino nano and 5 MG90s motors. I was thinking about using 2 3.7v but that would lead to 7.4, over the limit of the MG90S. I searched up that it can handle up to 6v, but the arduino nano cannot take 6v due to the VIN being 7-12v and 5v pin being too low. Im using a breadboard for the wiring at the moment. Should I get different servos?
The 7.4V for 2S lipos will be too much. The fully charged pack can go up to 8.4V.
If you are just experimenting, you could use a 4xAA pack for testing purposes. The servos will just move more slowly. It will be insufficient to power 5 of the servos, though.
Breadboards are for temporary experiments with logic devices and when used with motors and servos, the tracks will burn. Use a servo power distribution PCB instead.
You can give this setup a try. They have used a 9V battery.
Personally I faced problems controlling servos with ARduino nano using a common power supply. In my case I finally used 2 18650 batteries in series. Can't remember the brand's name.
Then that would certainly be a tutorial to avoid.
What is the problem with it?
I was thinking about using 2 3.7v but that would lead to 7.4, over the limit of the MG90S.
That would apply to 9V as well. Plus, the 9V PP3 battery is for smoke alarms, and totally unsuitable for just about anything associated with Arduino.
A 4xAA battery pack can supply about 2A, which would be fine for 3 MG90S servos. Don't forget to connect all the grounds.
But alkalines are just a little too much for the Nano. Feed it via the 5 V pin - "Vcc" through a common silicon diode (1N4004) in series to reduce the voltage
Four Ni-MH batteries would generally be perfect for both Nano and servo.
My post is about powering the servos.
It is a bad idea to power an Arduino and servos from the same supply, as servo electrical noise can reset the Arduino, cause it to malfunction, or even damage it.
Yes. You are right. It's always the best practice to use a different power supply for the servo motor.
So how come most commercial systems - RC models and such - use the same battery? 