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Topic: Connecting 3.3 V of Arduino to analog input  (Read 191 times) previous topic - next topic

Raj1212

Hi i want to connect 3.3 volt of Arduino board to analog input  for controlling some water level .

is it safe for the board ? or  Do i need to use a series resistor?

thanks for the helps

MarkT

Which Arduino?  If its a 5V Arduino then 3.3V is between 0V and 5V so its fine.

It never hurts to add a series resistor of upto 10k to an analog input.
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GarageGeek

3.3v is safe to use...but board type is important to know here.  The default voltage reference for analogRead will also depend on your board voltage.  Reading a 0-3.3v analog sensor with a 5v reference will only use 2/3 of your range.  This is easy to fix.  Just need to know more about what you're trying to do.



MarkT

You should explain what your hardware is - we need to complete picture, not edited highlights, in
order to figure out whether you have a workable approach.
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