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October 25, 2009
about 10 years ago
Reading the datasheet for the LCD:
Input Voltage (VDD): Min: 3.1V Typ: 3.3V Max: 3.5V
"H" Level Input Voltage: Min: 2.2V Typ: - Max: VDD
From Arduino Duemilanove page, under "Input and Output":
"Each of the 14 digital pins on the Duemilanove can be used as an input or output ... They operate at 5 volts." (emphasis mine)
However, looking at Arduino Pro page, under the same "Input and Output" section:
"Each of the 14 digital pins on the Pro can be used as an input or output ... They operate at 3.3 volts." (again, emphasis mine).
The above bit for Pro doesn't mention if it's 5V for the 5V version, but if you're using the 3.3V version of the Pro, it stands to reason that it will at least run its digital I/O pins at 3.3V instead of stepping it up to 5V.
I hope this helps, and didn't come too late.
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