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[on:]

I tried loading the blink sketch to an atmega48 using my Uno as ISP.
I've installed Mark S  extras from http://www.avr-developers.com/
I've setup the atmega48 on a breadboard with a 16mhz resonator.
But I keep getting this error message:

avrdude: Expected signature for ATMEGA48 is 1E 92 05
             Double check chip, or use -F to override this check.

Any help would be very much appreciated.

[Reply #1 on:]

Disable auto-reset on the Uno.

[Reply #2 on:]

With a 10uF cap between GND and RESET? The - of the cap to GND.  Tried that! 

[Reply #3 on:]

The error message includes the actual signature of the processor that responded.  What was the value?

[Reply #4 on:]

1E 92 05

That's an ATmega48A, which has a different signature for some reason.
You should change your compile and download to specify the A version.  (If it's not supported by one or the other, it's probably OK to use the override switch in this case...)

[Reply #5 on:]

What do I need to do to change that signature?
Change something in the board.txt? or recompile something (witch I'm not setup to do!  )

 

[Reply #6 on:]

You're not using avrdude by itself, even though you're skipping the bootloader?  Hmm.  It might work if you change your boards.txt from:
atmega48.name=Arduino Atmega48

atmega.upload.protocol=stk500
atmega48.upload.maximum_size=4096
atmega48.upload.speed=19200

atmega48.bootloader.low_fuses=0xff
atmega48.bootloader.high_fuses=0xdd
atmega48.bootloader.extended_fuses=0x00
atmega48.bootloader.path=atmega
atmega48.bootloader.file=ATmegaBOOT_168_diecimila.hex
atmega48.bootloader.unlock_bits=0x3F
atmega48.bootloader.lock_bits=0x0F

atmega48.build.mcu=atmega48
atmega48.build.f_cpu=16000000L
atmega48.build.core=arduino

to

atmega48.name=Arduino Atmega48a

atmega.upload.protocol=stk500
atmega48.upload.maximum_size=4096
atmega48.upload.speed=19200

atmega48.bootloader.low_fuses=0xff
atmega48.bootloader.high_fuses=0xdd
atmega48.bootloader.extended_fuses=0x00
atmega48.bootloader.path=atmega
atmega48.bootloader.file=ATmegaBOOT_168_diecimila.hex
atmega48.bootloader.unlock_bits=0x3F
atmega48.bootloader.lock_bits=0x0F

atmega48.build.mcu=atmega48a
atmega48.build.f_cpu=16000000L
atmega48.build.core=arduino

[Reply #7 on:]

I've never used avrdude by itself. Don't mind trying it....but I don't have any programmer other the mu Arduino board (Arduino as ISP).
Would avrdude support Arduino as ISP as a programmer?

Thanks for all the the help westfw.....for this and all the other problems I had before.

[Reply #8 on:]

Ok now that I'm back home.....I've check my chip and it's an atmega48PA
It's signature is: 1e 92 0a
What and where do I need to change to make this signature change?

[Reply #9 on:]

OK I've manage to get past the signature error by changing the signature in the avrdude.conf file.
Avrdude tells me that the upload is successful, but I get no blinking?

Maybe just changing the signature is not enough? Maybe something more is needed?

There as to be a way to get this working!

[Reply #10 on:]

but I get no blinking?

Blinking from a Sketch you uploaded or blinking from the bootloader?

[Reply #11 on:]

From the blink sketch after it's supposedly on the chip.

[Reply #12 on:]

Is it blinking very slowly or not at all?  Try dividing the delay between blinks by 10.

Did you change the processor fuses to use a external resonator?