The Crowtail- Hall Sensor uses the Allegro™ A1101 Hall-effect switches are next generation replacements for the popular Allegro312x and 314x lines of unipolar switches.It measures the Hall Effect, which is a production of a voltage difference across an electrical conductor, transverse to an electric current in the conductor as well as a magnetic field perpendicular to the current. The output of the continuous-time switch Hall sensor switches low(turns on) when a magnetic field (south polarity) perpendicular to the Hall sensor exceeds the BOP threshold, and it switches high( turn off) when the magnetic field disappears.

Features