Thank you for replies, how many ampere can absorb arduino?
If you hook any battery at all to the 5V pin, you'll never ever get a proper 5V on the 5V buss of the board. ?
I connected 12v to the external power jack and noticed the board LEDs seemed brighter. Checked the voltage on the board 5v pin and it was ~8v! The external power circuit seems to be somewhat of a tutti-frutti design.
If you hook any battery at all to the 5V pin, you'll never ever get a proper 5V on the 5V buss of the board.
QuoteIf you hook any battery at all to the 5V pin, you'll never ever get a proper 5V on the 5V buss of the board.Why not? That pin IS the 5V bus on the card. Whether that pin is supplied from the 5V regulator, the USB port, or directly from outside, the devices connected to it will not see a difference, and devices connected to IO pins will not see a difference.
Zoomkat, sounds like you have a busted regulator.
I am using arduino uno. It has a port named as "Power". At that port there are pins available for 5v and GNG. So you can connect those pins to your external battery. I have tried it and it works fine.Regards
5V.This pin outputs a regulated 5V from the regulator on the board. The board can be supplied with power either from the DC power jack (7 - 12V), the USB connector (5V), or the VIN pin of the board (7-12V). Supplying voltage via the 5V or 3.3V pins bypasses the regulator, and can damage your board. We don't advise it.