Fix bricked (I think) Uno R3

Question

Is there any way possible to fix a bricked Uno R3? At least I believe its bricked. Have removed driver from original com port and reinstalled. No avail. Have tried updating boards in IDE. No avail. It has worked before as I used it as an ISP to flash my 3d printer MB. Could this have caused a problem with the bootloader?

Thanks for any assistance in advance.

ajcc · Answer

To make sure you didn't damage the board I would test if the USB-to-serial adapter works on the board. You can do this by sticking a ~1k ohm resistor between D0 and D1 (RX and TX) and then use the Serial Monitor in the Arduino IDE to see if what you type comes back. Don't forget to pull the resistor to make sure it's really coming back and not just echoing locally. If that works then something might be wrong with the Atmega328P. If it doesn't work then it could also be that the Arduino is driving the pins high or low, so test it when holding down reset too.

If you don't have a way to program the chip then the cheapest way to revive your board would be to just buy a pre-programmed Atmega328Ppre-programmed Atmega328P with the Arduino bootloader in it already. But that will only fix it if the board isn't damaged.

Since you already know how to use an Arduino as an ISP programmer I assume you only have one and can't reprogram the Atmega328P that way? It's strange that the bootloader would be damaged, but I don't know if Arduino write protect that part of flash, I'd assume it would do.

Fix bricked (I think) Uno R3

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