I need a tip or two. I have two brand new Uno. Took chip from one and followed Gammon Forum : Electronics : Microprocessors : How to make an Arduino-compatible minimal board to make a breadboard with no crystal version (using the pin 9 alternate for clocking to check bootloader). Worked well - till the point where I cannot get the signature from the breadboard chip (returns 00 00 00). Thus cannot change the bootloader to 8MHz internal clock....
Help would be really appreciated. Thanks Nick for awsome post easy to follow. Appreciated
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My guess about your problem is that the atmega chip will not respond because it will not run without a crystal, and its fuse bits are set to expect a crystal. Either:
Add a crystal to the breadboard (plus accompanying caps) so you can burn the 8MHz internal bootloader (which will change the fuse bits to expect no crystal). You can then remove the crystal from the breadboard.
Put the atmega back into the Uno and use the other Uno to burn the 8MHz internal bootloader into the first Uno. Then you can remove the chip again and use it on breadboard.
