I'd like to use an Arduino Uno R3 battery powered a datalogger. I want do supply it directly with a Step-Up regulated 5V rechargable battery powersource at power
I don't want to suppy it with 5V at the PowerJack or
Vin because it's not necessary an would result in lower voltage when powered with 5V at
Vin and unnecessary power dissipation at
Let's take a look at the schematic: http://arduino.cc/en/uploads/Main/Arduino_Uno_Rev3-schematic.pdf
I've edited it, take a look at the green areas and blue paths (ignore the yellow area at first):
Just supplying it at that
pin 5V however might destroy the linear regulator
U1 that regulates >5V+
Vin down to 5V, I fear.
- Is it acceptable and safe to suppy regulated 5V+ to
- Should I additionally short it to
Unfortunately there's no internal schematic for
U1 (NCP1117ST50T3G) in the datasheet.
Take a look at the yellow area: am I wrong or is the protection diode reversed? Shouldn't it have the catode at
As three answers state that it would be the safest way supplying the Arduino with regulated 5V though USB, let I should clarify my question a bit: I'd like to fit the setup within a small case, so I want to avoid plugging in a USB cable if possible.
Except for testing purposes where this might happen by accident, it's not possible that
Vcc 5V are available at the same time.