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Topic: Mega Power source (Read 1 time) previous topic - next topic

he3r0

I have Arduino Mega 2560, and few of the 12V baateries like this


Can i connect it directly to the power socket on the mega? or do i have to add something else in between?
--
HE3r0
d(R)ive safe

retrolefty

Yes that can be plugged directly into the external DC power connector on the mega board.

Lefty

Jantje


Yes that can be plugged directly into the external DC power connector on the mega board.

Lefty

Even though this is true I would add a note based on personal experience.
The recommended voltage for Arduino Mega is 7-12V. A fully charged Lead acid battery holds 14.4V.
The input voltage limits are 6-20V.
This is not taking into account additional hardware attached to your arduino. So if you just have a mega running to see the led flash you are 200% OK. If you add an ethernet shield and some motorshields you may run into troubles.

In other words. Yes you can run from a 12 volt led acid battery. But when you have lots of power consuming shields or power consuming additional electronics the Mega may get overheated. In this case make sure your mega gets enough cooling (no closed box or walls around the mega, have it ly down on its long side, use a ventilator) or better use a switching regulator and power with a modified USB cable. The last option will make your solution run 2 times longer.
Note that it is the power converter on the board that gets (to?) hot. 

Practically. Use the battery and have a feel from time to time to verify whether your power consumption is sustainable.

Best regards
Jantje
Do not PM me a question unless you are prepared to pay for consultancy.
Nederlandse sectie - http://arduino.cc/forum/index.php/board,77.0.html -

he3r0

Awesome, thank you guys for answers.
At This stage My projects Don't go further than simple LCD with ethernet Shield, and perhaps Some servos.  But im having feeling that Separate Circuit for 5v and 3.3v from battery To devices mighg Be a good idea. So i'll look Into that as well.
Once more, thank you guys.
--
HE3r0
d(R)ive safe

MAS3

If you're thinking about a mobile setup with motors, have a look at BEC speedcontrollers as used in RC models.
These often have a regulated power output to the RC receiver, and if i remember correctly, these are supposed to be at 4,8 or 6 volts.
Might be worth to have a look at these.
Have a look at "blink without delay".
Did you connect the grounds ?
Je kunt hier ook in het Nederlands terecht: http://arduino.cc/forum/index.php/board,77.0.html

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