A magnetic input apparatus and method for a computer device are disclosed. A grid pattern of magnetic sensors can include a plurality of Hall elements. Each Hall element is selectively coupled to a Hall voltage sensor. A source of magnetic field can be placed in proximity to the grid pattern and one or more Hall voltage measurements for one or more of the regions can be collected with the Hall voltage sensor. The measurements can be analyzed to determine a position of the source of the magnetic field with respect to the grid pattern. Input can be provided to the computer program based on the determined position of the source of the magnetic field.