Square D: Turntable December 13, 2007 Sam Garza Havan Tucker Bob Ramenofsky Anne Killough

Occupancy Sensor Wall Switch Occupancy Sensor Senses when room is occupied to switch light on/off Uses ultrasonic and PIR sensing technology Saves energy by minimizing unused light Detects major motion in rooms up to 1000 sq. ft

Current Testing Procedure PIR must be tested to meet NEMA standards to detect minor motion Problem: Inefficient and tedious Takes at least 7 hours to test one unit Takes up valuable space No synchronization between control and robotic arm

Current Testing Procedure Measurements in feet

Requirements Goal: improve current testing process Shorter time Test in less space More automation between robotic arm and sensor Maintain Conformance to NEMA testing standards

Operational Concept Rotate sensor to simulate positioning of robotic arm at various locations in the coverage pattern. (Measurements in feet)

Operational Concept

Benefits Smaller required space Automated data recording More efficient

System Overview System Diagram

Operational Overview

System Design Requirements Controller PIC Controller Ethernet on board Ability to communicate with motor driver circuit Extra general purpose I/O pins Turntable Sensor mounted exactly 48” above floor (per NEMA) Portable Durable User Interface Windows compatible User friendly Store sensor/coordinate data

System Design Requirements Motor Driver Circuit & Mechanical Assembly Capable of ± 90 ° rotation at a resolution of .5 of a degree Sensor Circuit Capable of relaying the state of the occupancy sensor’s relay to the controller Protect controller from harmful voltage spikes

Tentative Schedule

References Bill Stottlemyer – Square D NEMA Guide Publication: WD7-2000 Specifiec Reports: Occupancy sensors