Electronic – arduino – Changed fuses on ATtiny85, now Invalid Device Signature

arduinoattinyavrdude

I changed the clock fuse bits on my ATtiny85. Now I can't flash anything to it or even change the fuse back. I get the error:

avrdude.exe: Device signature = 0x000000
avrdude.exe: Yikes!  Invalid device signature.
             Double check connections and try again, or use -F to override
             this check.

The command line command I used to change the fuse initially was:

avrdude -p attiny85 -P com8     -c stk500v1    -b 19200 -U lfuse:w:0x62:m -U flash:w:main.hex

Now I understand that I set the clock fuse for an oscillating clock signal, not for a crystal. I read here that I can supply the necessary clock signal from an stk500. My Arduino UNO is functioning as programmer (and in the command line args, I actually tell avrdude that it's an stk500). How do I connect/configure UNO and ATtiny to supply the necessary clock signal?

EDIT

I'm not trying to use High Voltage Parallel Programming. I just want to supply the external clock signal which the AVR now expects in order to program it as normal.

I have a second Arduino, and I tried to send a 16MHz square wave to pin 2 (CLK1) of the ATtiny85, using the code on this page. However, when I tried to program the AVR with both Arduinos hooked up to it (both the clock and the programmer), I got the same error as before. Any idea what's wrong?

Best Answer

The guys on the Arduino forums helped me out. Apparently, my code was not creating PWM. Otherwise the concept is sound. Here's their answer and all of my steps.

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