Before I get any thumb-downs, I would like to mention that I have read all the questions posted regarding the issue I have, but none of them had a working answer to my problem.
Here's my problem:
I have recently plugged in an DC motor directly to my Arduino UNO, and it resulted in the atmega328p being completely fried. So, I went ahead and purchased a new ATMEGA328P-PU and replaced it with the toast one. The computer, however, still won't recognize my chip.
My questions are:
Why is my microcontroller not being recognized?
Is there a chance that what I've done have completely fried the microcontroller, not only the bootloader?
Things I have tried/observed:
I have noticed that the new bootloader blinks the 'L' LED. My assumption here is that the bootloader comes pre-compiled with the 'Blink' project.
I own 7 computers (with the three major OSs on them). None of my computers was able to recognize the microcontroller (so at least now I know it's not an issue with the USB connection).
I am considering buying a new Arduino UNO, but before I do so, I really need to know what exactly is wrong with this one, just to avoid encountering similar issues in the future.
I know I'm desperate and slightly out of options when I end up posting on stackoverflow. So, I'd highly appreciate any contribution to solve my problem.
Best Answer
Just to clarify, you purchased an ATMega328P microcontroller with the Ardunio Bootloader already programmed into it? if that is the case, it sounds like the ATMega16u2 interfacce chip on your uno is bad. Its sits between the usb connection and the AtMega328 and convert usb signals to TX and RX serial data onto pins 2 and 2.
You could measure your 5v on the board and make sure its still good. If its good, its probably a bad board. The 5V may have gotten a spike from the motor.