high and low issues pic12F683

[skimask]

I have a pin that goes high (1.5v) when a button is pressed but when it's not pressed it's at .4v which the microcontroller can't see as "low". Basicly I need the microcontroller to see this .4v as low.

The microcontroller's VCC is 3.0v. I thought there was a way to compare a pin's volatage to vcc which I thought would make this happen but I forgot how.

Any help would be appreciated.

It should...must be something else wrong...
From the 12F683 datasheet...DS41211D...page 121...parameters D030, D030A, D031.
If the pin is a TTL input, logic low is .15Vdd = 3 * .15 = .45V
If the pin is a schmitt trigger input, logic low is .2Vdd = 3 * .2 = .6V
Anything less than those two values above (i.e. your .4v) would be read as a logic low, assuming you have the ports set up correct (i.e. digital, not analog, input, not output, and so on)...
Do you know what a pulldown resistor is?