On my UNO the chip is labeled “ATmega328P-PU”, and I ordered some of those for stand alone projects. The ones I got are labeled “ATmega328P U”, and if I put one of them into the UNO, they appear to be perfectly interchangeable.
However, I want to change the bootloader to run on the internal 8MHz clock but it seems like I cannot burn the bootloader to the new chips. I have followed this guide but the procedure fails and the output I get is:
avrdude: stk500_recv(): programmer is not responding avrdude: stk500_getsync() attempt X of 10: not in sync: resp=0x00
Where X increases from 1 to 10.
So… Where’s the skunk burried…?
EDIT: Solved, read post #8
P U above P-PU