hi !! i was using my arduino uno and suddenly it turns off !! when i connect it with usb cable it works 5/5 but when i connect it with jack (serial 6 AA battery) the power green led is very low and i got only 2V in output pins 5V and 3V !!
Does anyone have any ideas, where the problem can lie?
thank's
voltage between GND and Vout pin of the regulator ( it's an ams1117) also 2 v !!!!!!
serial 6 AA battery
What does this mean?
i mean six batteries arranged in a series, produce ~ 8 Volt
Do you measure 8 volts across the batteries when there are plugged into the Arduino power jack?
thank's for response.
yes between GND and Vin pin of the regulator ~ 8 volt and between the GND and the Vout pin of the regulator ~ 2V
i was using my arduino uno and suddenly it turns off !!
So it was working with the batteries, something happened, now it does not work?
It still works with the USB cable only?
yes i tested it with the usb cable and it works very well
also I measured voltage in 5V and 3.3V pin of the arduino and they are OK ! ( always with USB cable )
Does anyone have any suggestions how to get this fixed please 
i have only this arduino card and i need it quickly for my project 
Sounds like the 5V regulator is broken.
okay if i try to replace it !! do i have to use the same regulator/reference or just any 5V regulator ?
ronny441:
okay if i try to replace it !! do i have to use the same regulator/reference or just any 5V regulator ?
The one on the board is this:
http://unihedron.com/projects/sqm-le/PDFspecs/NCP1117-D.PDF
But it's nothing special. In theory anything with more or less those characteristics will work.
Another option is to get a LM7805 regulator. Cut a USB cable in half and connect the output of the regulator to the red/black wires of the cable. Connect that to the Arduino USB connector.
thank you very much sir.
i'll try to replace the regulator with an LM7805 1.5 A output current(isn't too much for the arduino uno !!!!! ? ) , hope that work
ronny441:
LM7805 1.5 A output current(isn't too much for the arduino uno !!!!! ?
Not if Ohm's law is still working.
(I haven't checked it today...)
i replaced the regulator with an 7805 after I matched up the connections and my board was resurrected.
now i can use power source like before.
a big thank you to both of you, LarryD & especially fungus.
ronny441:
hi !! i was using my arduino uno and suddenly it turns off !! when i connect it with usb cable it works 5/5 but when i connect it with jack (serial 6 AA battery) the power green led is very low and i got only 2V in output pins 5V and 3V !!Does anyone have any ideas, where the problem can lie?
thank's
reinstall your bootloader
for help write: mail.skullbucks@gmail.com
skullbucks:
ronny441:
hi !! i was using my arduino uno and suddenly it turns off !! when i connect it with usb cable it works 5/5 but when i connect it with jack (serial 6 AA battery) the power green led is very low and i got only 2V in output pins 5V and 3V !!Does anyone have any ideas, where the problem can lie?
thank's
reinstall your bootloader
for help write: mail.skullbucks@gmail.com
Bad advice, the bootloader has no relationship of having low Vcc voltage when using external power. Also board works on USB so how can bootloader be bad?
More testing could help. With the battery pack plugged in and the board not plugged into USB what voltage do you read between the arduino Vin and ground pin?