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Topic: Maximun Aref (Read 384 times) previous topic - next topic

lyft

I have gotten nothing but great help from you guys on this board. :)

Now I have another question to ask.  How high can I set AREF using analogReference(EXTERNAL)?  I have a pressure transducer that returns 1-11v when it sees 0-4000 psig. I don't intend to measure more then 2000 psig but would like to play it safe.

Thanks again in advance.   :D

BenF

The AtMega datasheets says:

Quote
Absolute Maximum Ratings

Voltage on any Pin except RESET
with respect to Ground ................................-0.5V to VCC+0.5V

You can use a voltage divider on the transducer output however to bring the 0-11V down to the 0-5V safe range.

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