ATTiny85 programming error
I'm having a bit of trouble with programming an ATTiny85 using an Arduino Uno. I've previously been able to program them quite easily using the method shown here; http://highlowtech.org/?p=1695 I've tried using both a homemade programming shield and wiring a breadboard, but I get the same error each time;
avrdude: Yikes! Invalid device signature.
Double check connections and try again, or use -F to override
I don't know what this means or how to fix it. I know my wiring is good, the breadboard is at least quadruple checked and I have used the shield many many times before. Any suggestions or ideas?