Hello.
So I've decided to make a project for my daily use, but the thing is, that my arduino board cannot be powered from anything but an outled on wall. well i could use some 9v batteries, but for daily use, it don't think that it's a good idea.
then, I found a block of my old charger, which has usb and plugs into outled(normally) and on it it's written that it's input is 100-240v, and output of 5v.
since I already know, that arduino runs pretty well with 5v, maybe it would be good idea to use that block to power arduino, but I still need to make sure that it is safe.
* outlet.
Yes, you certainly can use a USB charger to deliver power via the USB port.
It would be no different from powering the Arduino from a USB port on a computer.
You can also use any other device that will apply the specified voltage to the barrel jack
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I do it all the time.
One thing to know, however, is that some cell phone charging battery packs have a "feature" wherein they shut down if the current being drawn is too low.
So.
If your project always uses enough current, you good.
If your charging battery is not crippled in that manner, you good. If you buy one, see if it says. If you have one, test it.
Otherwise, you'll have to employ one of several well known tricks to occasionally draw enough current to keep the battery from going to sleep on you.
When that was happening to me, I don't want to say how long it was before I realized what was going on…
HTH
a7
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