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

2. 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

3. 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

4. Current Testing Procedure
Measurements in feet

5. 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

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

7. Operational Concept

8. Benefits Smaller required space Automated data recording
More efficient

9. System Overview
System Diagram

10. Operational Overview

11. 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

12. 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

13. Tentative Schedule

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