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Author Topic: Arduino + 2 Servos + External Power  (Read 837 times)
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Amparo, SP
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Hi all,

An external power of 5V - 2.5Ah is enough for 2 servos + Arduino?

Thanks.
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I don't think you connected the grounds, Dave.
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I depends on how much current the servos draw, which usually depends on how powerful / fast the servos are.
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External power supplies are generally NOT rated in amp-hours. Batteries are. One generally expects a wall-wart to be able to supply the rated current forever, not for some number of hours.
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I don't think you connected the grounds, Dave.
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Missed the "h"  smiley-sad
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Amparo, SP
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I depends on how much current the servos draw, which usually depends on how powerful / fast the servos are.

The servos are these:

http://www.servodatabase.com/servo/hextronik/hx5010

Do you knows how much is the consume?

Will this power supply is enough?
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The servos look like fairly typical servos, so a supply capable of supplying 2 or three amps at 5V would be adequate, I would think.

Quote
Will this power supply is enough?
We still don't know enough about the supply.
What is it?
Are there any markings on it?

For example, 'D' cells can be rated at up to 14Ah, but only for very modest current draws.
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Amparo, SP
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The servos look like fairly typical servos, so a supply capable of supplying 2 or three amps at 5V would be adequate, I would think.

Quote
Will this power supply is enough?
We still don't know enough about the supply.
What is it?
Are there any markings on it?

For example, 'D' cells can be rated at up to 14Ah, but only for very modest current draws.

AWOL, the supply is not a battery, is a supply like this:

http://www.arstech.com/item-External-Power-Supply-5V-AU-pwr5vau.html


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The servos will perform better if they are supplied ~6v instead of 5v.
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@Rafael
Here's some basic info on the specs you've given.

Servos (like any other appliance) require some minimum current to work.
If a power source can provide that much current (at the required voltage), then everything should work.
Amp-hours is not a measure of current. It is a a measure of the duration of time for which that the power source can supply current. So a battery rated at , say, 1 Amp-hour could provide 1 Amp for a duration of 1 hour or a current of 0.5A for 2 hours or 0.1Amps for 10 hours.

So what you need to match is the current required by your servos and the maximum current that the power supply can provide.
Hope this helped. (this was my first post meant to answer a question  smiley )
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