The weird of my 5v 10a swithcing power supply

So guys there is problem in my project.
I trying to use 1 Servo to this.
so here the diagram

Arduino Uno pin 9 >>> Orange pin Servo
5v pin >>> Red pin Servo
GND pin >>> Black pin Servo

everything worked. nothing wrong.

but if I want to expand into Breadboard there is something odd.

5v 10a PSU switching+ >>> +, - >>> -

  • pin >>> Red Servo pin
  • pin >>> black servo pin
    Orange Servo pin >>> pin 9 Arduino.

Nothing working.
already use multimeter.

From Arduino 5v and GND. showing 5.11 volt
From + and - In Breadboard showing 5.10 Volt.

I dont understand what is happening. does anybody know what cause is this?

I just bought the PSU recently
Thanx for advance

Is the PSU ground (-) connected to the Arduino GND?

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Take the servo + from the power supply, not a controller pin. The tiny conducting strips on the board are not designed for motor currents. They might pop.

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Hi, @shaorune
Welcome to the forum.
As @jim-p has said.
Like in this schematic.

Tom.. :smiley: :+1: :coffee: :australia:

well, 5V 10A are probably too much for an arduino. try using a 2A PSU or a usb port

It doesn't matter to the Arduino that the power source can supply more current than it requires!!
The Arduino will just take what it needs.

The only thing to beware of is that switch-mode power supplies tend to have a minimum load requirement - and the regulation will be not so good if you don't meet that ...

2 Likes

The PSU model is kinda look like Laptop charger brick. so there is only + and -

is there anything I can do. I want controlling 5 servos within the breadboard. I already use PCA9685. turn out. they cant handle 5 servos multiple at once

Is the black wire from the servo connected to he arduino GND?

2 Likes

er no. the black wire from servo into - breadboard. and then the - wire into the PSU

btw here is my schematic

Dont mind the 9v battery . the web dont have actual DC jack
the one I use is 5v 10a Adapter

The black wire from the servo needs to connect to BOTH the PSU - AND the Arduino GND

2 Likes

How many servos is the 9685 handle? 4?
Run the fifth one directly from tje controller.

Oh. WOOOW. This Working. Finnally Didn't know the GND need to pin into Arduino GND.
Thanx a lot.

I once Running 12 Servos.
6 MG996r
6 MG90s

the First pin from 0 to 6. can work at same times. but to control 12 Servos. its starting jittering or not even working.

Btw I use software name "Bottango" this software is used heavily for Animatronic.
the Dev already stated. if you want to control more than 6 Servos. dont use PCA9685.
there is a lot Data and step from PC into PCA9685.
so its started lagging. and not working.
after that I scale down my project. just use 1 Uno and 2 Nano.

You will need a 20A supply to run all those servos at the same time and you cannot connect the power leads (Red,Black) through a breadboard.

2 Likes

New info, 3 controlers. That can create more then lots of tricky problems.

There are NO filter capacitors in a laptop power supply, as I found out. The laptop batteries also perform like filter capacitors. MY test psu only had about 5 volts of DC when operated by itself.

Really?

Most laptops will run fine with no battery - so that seems unlikely?

That is because they use the internal 15 volt to 5 volt circuitry which does have filter caps.

is that because the metal inside Breadboard cant handle more than 10amp ????