DS24B33/DS2431 eeprom

i==3

Ahh, right! It still makes me cringe a bit :) Maybe just add a comment as to why it's like that?

If the OneWire.write(Array) is added it'd actually simplify that a lot.

Does the delay after writing seem to be a common thing? If so it might be worth adding a 'finished' callback to the API?

if you don't export the whole class, then you can't add things to the prototype?

Well, you can, it's just ever so slightly more difficult:

function A() {
}

function getA() {
  return new A();  
}
var a= getA();
a.__proto__.constructor.prototype.bob = 42;

a.bob
// 42

Personally I'm not sure it's really worth the extra effort and memory usage to make it a tiny bit easier for the few people who would want to extend the basic class.