It's 8-bit resolution. And I haven't really tested it extensively, but initial tests proved fairly accurate. At least close enough for my application.
Just made this altimeter for my quadcopter, pretty proud of it! It uses a PIC12F675 to read a Motorola MPX4115A pressure sensor. It then transmits that data serially to an Arduino through a bit banging routine. I should cite this page [http://jbgizmo.com/page27.htm] as the source for the circuit. I wrote my own code in C, instead of using his.
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