Well the new Due board solved that, it's 3.3v only, slap on a 5 volt shield and it might ruin your day.
I realize this may be anathema to Atmel advocates,
My home brew boards all have jumpers to select Vdd = 5V or 3.3V. I've been running 328's at 3.3V and 16 Mhz fine for year nowThat's your choice, but anecdotal tales of running parts outside their spec proves nothing. Going around telling people it's OK to do so isn't doing anybody a service.
5V shield only ruins your day if you power it from 5V.So power it from 3.3V instead and all is honky-dory.
5V shield only ruins your day if you power it from 5V.So power it from 3.3V instead and all is honky-dory.So any active components on any specific legacy 5 volt shield will run at 3.3vd? Also there is still 5vdc on the 5V shield pin even on a Due board, so any old 5 volt shield will still run at 5vdc just due (no pun) to the fact that it's mounted to a Due board.Gives me an idea for a DUE shield. Bring all pins in, but only 3.3V for power. Any device must be 3.3V device.Easy to design a shield for Due use only or for Uno use only, trying to get a shield compatible for both is what we are asking about.2nd shield - Bring 5V in, but provide offset female headers that are all 3.3/5V buffered with TXB0108 chips or equivalent. Fully compatible with 5V shields, but only 3.3V is exchanged with the DUE.Maybe, not familiar with that TSB0108 chip. Does it support the high output current that a 8 bit AVR output pin can supply?Lefty