1. Project Description The Square D occupancy sensors use both ultrasonic and passive infrared technology (PIR) to detect occupancy in a room. This project is concerned with the sensitivity characterization of the PIR aspect of these sensors. This project involves improving the pre-development test process for wall switch occupancy sensors. The current procedure takes a minimum of 7 hours to test a single sensor. It involves dividing a large room into 3 x 3 foot cells and testing movement in each cell. The objective of this project is to make the testing process more efficient by reducing the space required for testing and by speeding the process up. This project also attempted to automate as much testing as possible and automatically log the data obtained from the testing process. The project allows for the operator to test remotely (i.e. from a different room) in order to ensure that the testing environment is not contaminated by additional IR radiation. Additionally, this project included a redesign of the robotic arm in order to meet NEMA* standards. Turntable The current testing procedure allows for the positioning of the robotic arm at a certain distance away from the sensor. In addition, the arm is placed at a certain angle from the sensor between -90˚ and +90˚ from the centerline. Instead of having the robotic arm move to each designated square, the proposed system will allow for the turntable to rotate to a specific angle made by the centerline of the sensor and the fixed centerline of the room. In order for the proposed system to be effective, the turntable must be capable of rotating to every angle that was measured between the robotic arm and the fixed centerline of the current system. Turntable Requirements  Sensor must be mounted exactly 48” above floor.  Sensor must be capable of ± 90 ° rotation at a resolution of.5 of a degree.  The entire system must be portable and durable. Conclusions The Square D project ended with complete success. System requirements were met and integration was successful with the two separate teams. Recommendations for future work include: Implementing an entire wireless system Automating the robotic arm movement to and from the sensor Vertical movement could be added to the sensor Introduction Havan Tucker – Sam Garza – Bob Ramenofsky – Anne Killough John Sullivan – Brian Auerbach – Will Hedgecock Vanderbilt University Sponsored by Square D Square D: Sensitivity Characterization of Occupancy Sensors *National Electric Manufacturers Association (NEMA) Operational Concept The improved testing procedure involves a robotic arm imitating a human arm and a turntable rotating the sensor to decrease the amount of space required for testing. This process is automated and controlled by the central command and control assembly. The system diagram can be seen below: The operational diagram below explains the steps involved between these major components. Turntable Firmware The responsibilities of the turntable firmware include maintaining communications with the computer, control the servo motor, and keep track of the status of the sensor relay. Maintaining Communications with the Computer  Using DHCP to automatically assign an IP address  Initializes the TCP/IP stack  Listen for TCP connections on 24321 and 24322  Wait until connections are established  Pass control to the main OS task Control the Servo Motor  Using the timer system to scale down the clock  Output compare to match our timeout values  First a timeout value is set for the high part of the square wave  After this timeout, a value is set for the low portion of the square wave  This creates a 33 ms period of variable duty cycle Keep Track of the Status of the Relay  Utilizes the same timer system that controls the servo motor  When the relay state changes, sends a TCP message to the controlling computer Turntable Hardware  Microcontroller: NetBurner MOD5272 Development Kit - Motorola MFC5272 Microcontroller - NetBurner MOD5272 Development Board - NetBurner Embedded Ethernet Core Module - 2 Serial Ports - 4 Timers - General Purpose I/O Ports (50 pins per header) - 32-bit processor  Servo Motor: Hi-tec HS-645MG - 107 oz-in. of torque at 4.8 V - Dual ball bearing design - Weighs 1.94 oz.  Sensor Compartment: Single gang PVC switchbox  Power Supplies: 120v AC to 5v DC (2)  Mounting Cart: Audio/Visual Cart - Buhl BAV-4226C compact AV cabinet cart - 42’’ tall The turntable places the sensor in a stationary position excluding a rotating motion ± 90 °. The microcontroller receives a command to place The sensor at a specific angle. After the sensor is in position the robotic arm is signaled to move. The PC is notified whenever the sensor is activated. This figure shows the turntable system overview.