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?