Quote Originally Posted by plyrathrt View Post
I can't put a pull down resistor on there because grounding the contact I am trying to connect to will make it not function.

Is there any other way to make it accept .4v as low? Coding tricks or anything?
Re-read the last post!
It already should be taking .4v as low UNLESS something else isn't set up correctly.
Increase the Vdd, double-check your config, try another chip, try another meter.
And putting in a pulldown resistor isn't grounding a contact.