I recently picked up a Sanguino and am trying to configure it to run off a 3V regulator. I swapped the 7805 regulator for a MCP1700-300 and the 16MHz crystal for an 8MHz one.
Prior to making the changes I verified I had everything set up and working by loading the “blink” example using the Arduino IDE. That worked just fine. After swapping the parts the Sanguino powers up and blinks the led as expected. My problem is that when I try to load a different sketch I get the typical “sync” error indicating that the board isn’t responding.
After Googling and digging around a bit I found that the boards.txt file has a cpu speed entry that was 16000000L, I changed that to 8000000L but I still get the sync error.
I’ve found several references to the Fuses in the 644 chip. Unfortunately what I’ve found doesn’t seem to provide a consistent answer and I’ve managed to confuse myself about how and what to do to configure the fuses in the way I need to.
For clarity, what I want to be able to do is use the Arduino IDE to load sketches to a Sanguino board running at 3V with an 8MHz crystal.
Would anybody know what the proper fuse configuration should be for what I’m trying to do?