Alright guys I feel like an idiot but here's what happened... I built a project on my Arduino, which was hooked to my laptop for power and communication. Everything was fine, no problems, and I finished my project (actually a pretty cool one involving a pressure sensor with some customizeable settings, but that's beside the point.)
After I finished my project, I went over to a friend's house and wanted to show him what I had built. I did not have my laptop on me at that point and he gets weird about me using his computer for stuff (even usb power) so I used usb wall charger for a cell phone and plugged my usb to type-B connector into it, and powered my Arduino with that. I should have checked first of course, but I assumed tha
My assumption here was that the voltage from this source would be 5 volts, because that is the standard voltage for usb devices. I did not measure the usb-B output voltage, but I can only assume that it would also be 5 volts because the type of connector should not affect the output voltage. The current should have been regulated by any internal resistance in my Arduino and therefore I did not think this would negatively impact my device.
Here's the problem... I showed my friend my project and it worked fine, no issues. I unplugged it and set it aside for the time being. That was yesterday, and today I went to plug in my project and the Arduino does not power up. By this, I mean that the power LED does not light up, and there is no indication of any activity in the circuit. I tried connecting the Arduino to my PC and also via a 9v battery to the barrel jack, and no power anywhere.
So my question is, did I kill my poor Arduino?? I am an electrical engineering student and so murdering a component here and there is not a big deal, but of course I love my Arduino and hope I did not kill him, and would rather not drop the $20-$40 to buy a new unit.
If anyone has any help/suggestions, I am all ears!! Thank you