Hi
My intention is to use a laptop battery that tops at 12.2v to power a arduino uno, since the recomendation is 12v, an extra 0.2v can damage the arduino?
I will only use the laptop battery if its perfectly safe..
Thanks.
You'll be OK if you power the Arduino that way.
If you are planning on powering other stuff through the Arduino's regulator, then you have to take a bit more care.
Do not try to power a standard LED by all output pins available.
So the question here is:
What else do you plan to power using the Arduino's 5 volt supply ?
Thanks for the answer.
I will also power an ADC and a bluetooth module from arduino 5v.
Just remember that the 5V regulator has to dissipate excess source voltage as heat:
Power dissilated = (source voltage - 5V) x current used.
Current used includes 3.3V current as well.
So if you needed 200mA for the Arduino, some LEDs, some 3.3V current, the ADC and the Bluetooth:
P = (12.2V - 5V) * .2A = 1.44W, the regulator may get toasty warm.
If you could use a switching regulator to bring the 12.2V down to 7.5V to feed into the barrel jack, or even better 5V to bring into the 5V header, you'll get a lot more life out of your battery.
Hi,
There are also versions of Arduino UNO that have a higher current power regulator.
Like the YourDuino RoboRED can supply 5V at 2A from 12V external power.
See: http://arduino-info.wikispaces.com/YourDuino-RoboRED
This is nice for running several Servos, etc.
DISCLAIMER: Mentioned stuff from my own shop...