Motion sensors have a long history dating back to when early humans used movements of stars and crops to determine seasons. They were first widely used in World War II in mines and claymores to detect enemy movement. Technologically, motion sensors work by emitting waves that bounce off objects and are detected, with the information used to trigger a device. Today they have many applications in security, lighting, tracking, and more, bringing both benefits like convenience and disadvantages like easy accidental triggering. Motion sensors continue advancing, with potential uses like tracking performance through sensors embedded in clothing.

1. Motion Sensors Casey Corbin TED 111 Dr. Kallis

2. History Can be dated back to the evolution of man Used by farmers to determine when to plant their crops Calculated the movements of the stars to determine best growing season Motion sensors improved in World War II First recorded use of motion sensor was by Samuel Bagno Recorded in the 1940s Determined location of a person within a room

3. World War II First used with mines Mines placed below the ground would detonate when it sensed movement on the surface Also used with claymores Same concept as mines, but used above ground. Claymore would activate and go off when an object would trigger the waves it emitted Further advanced with radar Radar used to track enemy

4. Technological Concepts Waves are sent out through the detector These waves are used to detect movement Once the waves hit an object, they are bounced back to the detector. The waves bounced back are taken in and encoded The encoded information is then transmitted to the decoder

5. Technological Concepts cont. The information is then decoded Decoded information is then used to activate device The device, such as a flood light, is then turned on

6. Usage in Society Has many different applications and uses Lights, car alarms, home security systems, automatic doors, land mines, claymores, radar, and tracking convoys Advantages: Time saving, security, easy installation, energy saving, strong transmission Disadvantages: Easily triggered, loss of energy, loss of electricity, costly to purchase

7. Usage in Society cont. Positive effects: Greatly improved and advanced civilization Still improving today Negative effects: Has made military more dangerous Weapons more high tech and deadly

8. The Future Integrated more into everyday applications More lightweight and affordable motion sensors Micro Electrical Mechanical Systems (MEMS) MEMS could be placed in clothing to track performance Nike experimenting already

9. Works Cited Brister, Jennifer. (2009, June 3). Home Burglar Alarms . Retrieved April 9, 2010, from Suite101's website: http://homemanagement.suite 101.com/article.cfm/home_burglar_alarms Furnish, Tim. (2008). Motion Sensors . Retrieved January 25, 2010, from Illumin's website: http://illumin.usc.edu/article.php?artcile ID=179&page=1 Huebsch, Russel. (2009). History of Motion Detectors. Retrieved January 25, 2010, from eHow's website: http://www.ehow.com/about_5516868_history-motion-detectors.html. Martella, Melanie. (2010, March 26). Sensors For Military Maneuvers . Retrieved April 6, 2010, from Sensors' website: http://www.sensorsmag.com/sensors-mag/sensors-military- maneuvers-6969.

10. Works Cited cont. Mun, Yuen. (2009, July 17). How to Choose Motion Sensor Lights and Swtiches . Retrieved April 6, 2010, from Suite101's website: http://home- electrical.suite101.com/article.cfm/how_to_choose_motion_sensor_lights_and_switches. Ng, Shyh. (2007, June 12). Benefits of Motion Sensors . Retrieved April 9, 2010, from Motion Sensors' website: http://motionsensortech.blogspot.com/2007/06/benefits-of-motion- sensor.html.