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Topic: 5v down to 3.3v for 3.3v sensitive devices (Read 771 times) previous topic - next topic

iisfaq

Just a simple question

If I  am using a 5v arduino and my sensor or device requires 3.3v for power + data lines what is the best way to do this?

Should one just use a voltage divisor with 2 resisters?

Should one use a 3.3v regulator for the power + 2 resisters for the data lines?

Should one use a 3.3 volt regulator for eveything?

Is there something else you should use?

I am just wondering as I have really only used the 3.3v line from Arduino + 2 resisters but is that a good method? Doesn't this waste energy as heat? Especially when running from battery power?

Chris

wanderson

You need a regulator for 3.3v, but the Arduino's usually provide that.  You can get by with a resistor divider for data lines in some cases, but a level converter is a better general choice.
New true random number library available at: http://code.google.com/p/avr-hardware-random-number-generation/

Current version 1.0.1

iisfaq


You need a regulator for 3.3v, but the Arduino's usually provide that.  You can get by with a resistor divider for data lines in some cases, but a level converter is a better general choice.


Thanks for the advise, do you have a recommendation on a particular device?

I will do some searches myself now so I can get familar.

Cheers

Chris

wanderson

This is a little expensive, but it is a good general purpose converter with eight channels; http://www.adafruit.com/category/products/395


There are many other options though.
New true random number library available at: http://code.google.com/p/avr-hardware-random-number-generation/

Current version 1.0.1

jointtech


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