"using the ioref pin" means that the shileld uses that pin to power level translators so that the shield can work at 3.3v or 5v seamlessly.
You can look at the schematic diagram of the wifi shield to get an idea on how that's done.
m
"using the ioref pin" means that the shileld uses that pin to power level translators so that the shield can work at 3.3v or 5v seamlessly.
You can look at the schematic diagram of the wifi shield to get an idea on how that's done.
m