sandworm:
Hey guys,I picked up a 9v 2200ma battery to replace the piles of standard 9vs I've been going through. When I plugged it in, my arduino started to smoke, but I was able to unplug it in time to prevent permanent damage. Voltage testing revealed that the battery was actually outputting ~10.5v (probably because its brand new), so I made a voltage divider to reduce it to 9v, but the arduino still smoked.
I would still like to use this battery, but I am afraid to plug it in. Could it be the current that is the problem? If so, can I build a current divider that would work?
Thanks for your help!
Duane
Where did you connect the battery?
You need to connect it either to the barrel socket, positive to the center pin, or else to "Vin" (positive) and "gnd" (negative). You do NOT connect it to 5V and ground.
Also, did you have the polarity correct? On a 9V battery, the small round terminal is positive, the larger "crown" shaped terminal is negative.
Lastly, WHAT smoked on your board? Was it something in the power supply section (the stuff between the USB connector and the barrel jack)? Or was it the 328P processor itself?
If you released the Holy Smoke, the board is probably dead... you'll need to buy a new one.
Connected properly, that 9V battery should have worked perfectly. 9V is not too much at all.