I've seen this question asked several times but I wasn't able to find an answer to a few of my questions.
I have 10 servos that I want to connect to my Uno. I know I need an external power supply, and I have heard people are using 6v wall warts and the like, but do I need separate power supplies for each servo? Or just one for all? and if I only need one, is there anything special I need to set up in terms of resistance?
thanks, I realize this is a very basic question, but I want to make sure I'm powering everything adequately.
Depends on your servo power source: find out how much each servo draws, and you know how much your power adapter (supply) can provide, then figure out how many power adapters you need.
For example:
If you have a 7V 500mA power adapter, and each of your servos need 200mA you'd need 5 power adapter, each supplying 2 servos.
You probably also want to use a regulated power supply for the servos: unregulated supplies often put out a voltage much higher than the nominal one when the load isn't drawing much current. A 6V wall wart probably won't smoke your servo, but it might. You have to ask yourself if you feel lucky
It's very important that all power supply grounds (including the Arduino's) be connected together. Ideally, they should all be individually connected to a single point in a "star" configuration, but that's not as critical for servos as it is when you're dealing with small analog signals.
