Abstract: Detectors and related systems and methods for automatically detecting made and missed basketball shots using ultrasonics are provided. A launcher is connected to a structural subassembly and passes basketballs to locations about a basketball playing area having a basketball goal. A detector having at least one ultrasonic sensor is selectively positioned below and adjacent to a rim of the basketball goal and transmits bursts of ultrasonic signals. A processor monitors for reflections of the transmitted bursts occurring within a specified time period after transmission excluding an initial time period and time after the specified time period, and records a made shot where reflections of the transmitted bursts are detected within the specified time period. An accelerometer may optionally be included for determining if the made shot was a swish.

Abstract: An active intrinsically safe circuit for detecting and mitigating non-compliance of current, voltage, power, or heat to at a load which resides in a hazardous area, where non-compliance may cause danger to life or harm to property. The intrinsically safe circuit monitors current, voltage, power, or heat, shuts off or otherwise limits current, voltage, or power. The intrinsically safe circuit then tests for return of compliance, and acts to restore current, voltage, and power to the load upon return of compliance.