Arduino Forum

Using Arduino => Motors, Mechanics, Power and CNC => Topic started by: tanchorzheng on Feb 20, 2013, 01:51 pm

Title: (Help!!!) Power Supply for Leonardo
Post by: tanchorzheng on Feb 20, 2013, 01:51 pm
I'm thinking of ways for power supply for Leonardo since my project requires portability.

As I know the usb cable (usb micro B cable) that connects Leonardo to computer is same as the normal usb cable for smartphones
I'm thinking to use power bank to connect it, Is it possible? Is power bank able to drive Leonardo or is it too high for it?

Power Bank specification
12000 mAh
Output DC 5.0V - 1.0A/2.1A

Leonardo
Input Voltage (recommended)   7-12V
Operating Voltage 5V

Need some guidance here, Appreciate it~
Title: Re: (Help!!!) Power Supply for Leonardo
Post by: Erdin on Feb 20, 2013, 02:10 pm
The input voltage of 7-12V is for the adapter DC plug, or the Vin pin.
If you use the USB plug for power, it should be 5.0V.

So if your power bank is a regulated 5.0V (and not 5.5 or more) you can use it via the usb plug.
Can you paste a link to your power bank.
Title: Re: (Help!!!) Power Supply for Leonardo
Post by: tanchorzheng on Feb 20, 2013, 02:19 pm
Thanks a lot, u meant the link of the power bank?

http://www.lazada.com.my/Macsonic-Portable-Battery-Bank-12000mAh-White-113874.html
Title: Re: (Help!!!) Power Supply for Leonardo
Post by: Erdin on Feb 20, 2013, 02:34 pm
Thank you.

The output of the power bank is a good 5.0V, so you can power the Arduino with it via the USB plug.
The Arduino Leonardo has an automatic fuse for 500mA for the USB 5V. That is an extra safety feature.
http://arduino.cc/en/Main/arduinoBoardLeonardo
Title: Re: (Help!!!) Power Supply for Leonardo
Post by: tanchorzheng on Feb 20, 2013, 03:24 pm
The output Dc current 1A/ 2.1A, does it really affect the board as it has automatic fuse?
Title: Re: (Help!!!) Power Supply for Leonardo
Post by: retrolefty on Feb 20, 2013, 03:28 pm

The output Dc current 1A/ 2.1A, does it really affect the board as it has automatic fuse?

The Leonardo will 'draw' just the amount of +5vdc current it requires. Current is not pushed or forced, it is allowed to flow depending on the load resistance the board has. Ohm's law is your friend, learn it, think it, feel it.  ;)

Lefty