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Can I use an AC power adapter that can be connected through USB port? My board is Arduino Uno and usually connect to my computer through the USB cable.

AC power adapter <-> USB port <-(USB cable)-> Arduino USB port

What kinds of components can be used as external power supply for Arduino board? It's really nice if you have some images or names about them.

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Why shouldn't it be good? As long as the voltage and current is the same, there's no difference if it's generated by a PC or a converter... – clabacchio♦ Jan 24 '12 at 10:39
Aside from cost, why not hook up several 9V in parallel to power the board? – user10874 Jul 15 '12 at 19:08

2 Answers

up vote 5 down vote

An Arduino Uno can be powered by

  • a stable (regulated) 5V DC, which you can either supply via the USB power lines, or via the shield connectors, or
  • an unregulated 6-20 V DC (7-12V recommended), which you can supply via the 2.1 mm centre-positive barrel plug connector.

I would not recommend using a 9V battery, because its voltage will drop quickly, but in a pinch this can be used.

ref: http://arduino.cc/en/Main/ArduinoBoardUno

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do you have some images as example? I'm pretty much newbie at this stuff. – xjaphx Jan 25 '12 at 5:39
up vote 2 down vote

Yes, you could use a USB battery device or USB charger or a 9V battery clip with a 2.1mm DC power plug.

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Why Wouter van Ooijen doesn't recommend 9V battery and you do? – xjaphx Jan 25 '12 at 5:40
I included why I don't recommend a 9V battery. Hence you can infer that Hellonearthis gives less weigth to that argument. Conclude for yourself whether it is relevant in your case. – Wouter van Ooijen Jan 25 '12 at 8:16
This is what I use broken cell phone chargers for. BTW it's that hello near ths? Or hell on earth is? – cp1024 May 9 at 22:25

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