  We present a fast, simple method for automated data acquisition and
visualization of sound directivity, made convenient and accessible via a
smartphone app, "Polar Pattern Plotter." The app synchronizes measurements of
sound volume with the phone's angular orientation obtained from either compass,
gyroscope or accelerometer sensors and produces a graph and exportable data
file. It is generalizable to various sound sources and receivers via the use of
an input-jack-adaptor to supplant the smartphone's (omnidirectional)
microphone. Results provide both a visual and quantitative representation of
sound fields and device responses, adequate for introductory physics
experiments.
