I am working with 4 servos bit I don't know if I can use the 4 of them with my Arduino nano without any external supply of power, I don't know if my Arduino nano can supply enough energy for the 4 servos or I need a servo controller
Thanks
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You can use 4.
You need an external servo power supply.
Which Nano.
A classic Nano v3.0 can control up to 12 servos, but can power none.
With multiple servos it could be easier to buy a 16-channel PCA9685 servo board.
Leo..
Sorry I don't understand if you are saying that I can use 4 servos or I can't use the servos just taking the energy supply from the 5+ and GRN of the Arduino
I have just 4 normal servos micro servo 9g and I don't know if I can control and supply the 4 servos with the Arduino or I need more power
The Nano can talk to 4 servos, however, you must use an external servo power supply.
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An Arduino is not a power supply.
Four SG-90 have a combined stall current of about 2.5Amp.
You need a power supply that can deliver 5volt/3Amp.
Leo..
Ok so I can use the Arduino to control and a power supply of 5v?
Ok thanks and I need to connect the GRN that supply power to the servos to the Arduino too?
Yes.
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The Arduino GND needs to connect to the Servo Power Supply GND (0 Volts).
And can I use the same power supply for the servos and the Arduino?
Give us a link to your Arduino Nano.
To power the Arduino Nano, you should be able to connect the external 5V servo power supply to the 5V pin on the Arduino.
If this was an UNO, you need to be very careful doing this.
What do you mean with a link?
A WEB link (URL) to where you purchased your Nano.
In post#3 I asked "which Nano", which you didn't answer.
The correct answers may depend on which one you have.
Leo..
I think many novices are confused about servos because they do not realize that a servo needs two complete circuits to operate properly. The first circuit is the high current motor drive one that needs a power supply other than the regulator and PCB foil traces on the Arduino. The second circuit is the control one that supplies the low current position pulses supplied by the Arduino. Both circuits share the same 'ground' wire. I hope this helps.
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I have a Arduino project and I'm using 4 servos and an Arduino nano, can I power all that with a dc barrel power jack or I need to get another thing, my idea was just connected directly to the servos and Arduino but i feel it probably is a bad idea that why I want to ask
The Arduino cannot power any servos. Nor can a USB port.
Use a 5V power brick, capable of providing 1 Ampere per servo for SG-90 (so 4 A total) or 3 A/servo for MG996R (12 A total). Don't forget to connect the grounds.
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