Am getting into a project for some wireless control using an UNO, PCA 9685, 4x MG90S servos, and an HC-06. My intent is to hardwire a wall plug feeding both the Arduino and the servo driver with a 2A supply. The "Powering Alternatives for Arduino Boards" on the docs side of here reflects an UNO Rev3 recommended to have a 1A input, so will that remaining amp be enough for the 4 servos and Bluetooth connectivity? Only 1 MAYBE 2 servos would move at any given time
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Probably the 2A should do it. It is a better choice then the 1A. To determine amperage you need to sum up all the watts and divide by the voltage and you get the minimum requirement.
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Many times it’s best to power the project with a lab power supply and measure the amps.
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I cant see any current rating -= and be aware that the current needed to START a movement will be higher then the current when moving.
A servo that is under load (something pushing back while in position) will also use extra current to stay put. So just the time moving is not necessarily the only time they use a lot of current.
2A is probably enough.
If you have problems, get a bigger power supply. Remember, amps are delivered on demand, so a 10A supply won't deliver 10A when it's not needed.
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