havent tried yet. maybe tomorrow. I will see what happened
Can we please have a circuit diagram?
An image of a hand drawn schematic will be fine, include ALL power supplies, component names and pin labels.
Fritzy images leave out so much information... like the power supply.
See post #4.
Tom... 
PS Do you understand why you need the gnds connected together?
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The contacts in a solderless breadboard can't handle anything near 10A !!
Here's the first spec google found me: https://www.farnell.com/datasheets/2328332.pdf
I'd say that's being optimistic.
And that's for a good, named brand ...
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The really good expensive ones might handle one Amp OK. The cheap ones are probably OK for maybe 200mA. The contacts may not make a low resistance connection and may also conduct intermittently with high currents.
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here my original drawing.
Just pretend the Power supply is 5v 10a
1 arduino uno
1 arduino nano.
6 servo above is MG996r
6 Servo below is MG90s
about the GND need to connect. actually I still thinking this same like using PCA9685. lol
that why I kinda forgot that one
Hi,
Why two controllers?
The servo library will work on any digital pin, not just PWM assigned pins.
Tom..
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I use software called "bottango"
in documentation said. each servo need their own PWM pin.
max is 6
so I need 2 controller.
I'm not familiar with it.
Any reason you are not using the Arduino IDE?
Can you please post your code?
Thanks.. Tom...
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Switching PS needs about 10% minimum load to maintain regulation.
Breadboard can't pass motor currents. Build a Power Distribution Board:
Looks like pretty interesting software. Hard to keep up with it all.
Breadboards are for low power logic circuits, and cannot handle motor currents. The tracks will burn.
Therefore, avoid using breadboards for motors and servos. Either solder the power connections directly or use a servo power distribution PCB.
Don't forget to connect the Arduino and servo power supply grounds.
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