Is it possible to use the uArm Controller standalone without a connection to a PC?
I uploaded a sketch but when I unplugged the USB cable to the PC the program stopped responding.
You could connect the cable to the PC to another port which could provide power to the board.
I want to know how to power the controller without connection to a PC.
The controller board you sent is missing all the components in the 12V DC-DC 5V power supply circuit.
How do you suggest I power the board without a PC?
You could connect 5V power to this port
Is there a way to power the controller from the uArm?
No, maybe you could use a power bank or a 5v phone charger.
What is the current requirement of the uArm Controller from the 5V power supply?
An normal 5A1A is OK