sound - Oscilloscope using laptop microphone input...is that possible?

Its possible to have an oscilloscope from the input of the sound card? I'm trying to log the states of a PIC32 pin (min: 0V, máx: 3.6).

Is it possible to put that value on a 3.5" jack and, on the pc, have access to the sound card input values?

Answer

Be careful, your computer isn't made for this.

Another software (with the schematics to go with it): http://xoscope.sourceforge.net/

The hardware to go with it: http://xoscope.sourceforge.net/hardware/hardware.html