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http://translate.google.com/translate?js=y&prev=_t&hl=en&ie=UTF-8&layout=1&eotf=1&u=http%3A%2F%2Fdiy.elektroda.eu%2Fatmega-fusebit-doctor-hvpp%2F&sl=pl&tl=en

If I'm understanding this correctly, this guy built a programmer whose main purpose is to reset the code protect fuse?

It took me a while to realise that a "0" fuse bit is ticked and a "1" fuse bit is not ticked when using PonyProg, which resulted in an unprogrammable AVR due to invalid clock fuses. Fortunately, driving a clock signal into XTAL1 usually gets around this problem.

What this device does is provide high-voltage parallel programming in case you have accidentally disabled low-voltage serial programming (by either clearing SPIEN or setting RSTDISBL fuses, which disable SPI programming and the reset pin respectively).
benryves wrote:
It took me a while to realise that a "0" fuse bit is ticked and a "1" fuse bit is not ticked when using PonyProg, which resulted in an unprogrammable AVR due to invalid clock fuses. Fortunately, driving a clock signal into XTAL1 usually gets around this problem.

What this device does is provide high-voltage parallel programming in case you have accidentally disabled low-voltage serial programming (by either clearing SPIEN or setting RSTDISBL fuses, which disable SPI programming and the reset pin respectively).


What I don't understand is why this guy doesn't just use a regular HVPP instead of building his own and calling it the "fusebit doctor". All HVPP's are "fusebit doctors" Rolling Eyes
Here's a similar device I found for the Arduino: http://mightyohm.com/blog/products/avr-hv-rescue-shield/

It actually works pretty well (I've fixed 3 "broken" AVRs with this device on my breadboard.)

http://www.microcontrollerprog.com under $30, not worth to build one yourself.
TheAvrGuy wrote:
http://www.microcontrollerprog.com under $30, not worth to build one yourself.
Welcome to Cemetech, although I'm not convinced you're not a spambot.
Spambot, google search revels the guy is a spambot
TheAvrGuy wrote:
http://www.microcontrollerprog.com under $30, not worth to build one yourself.


Failbot is fail; it's actually $35 shipped.
Ultimate Dev'r wrote:
TheAvrGuy wrote:
http://www.microcontrollerprog.com under $30, not worth to build one yourself.


Failbot is fail; it's actually $35 shipped.
It's still not worth it though, right? Considering that AVRs are like 4-5 dollars, you've have to toast seven to nine of them for that to be worthwhile.
  
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