Bridget and Shelby's Situations

PIR sensor (passive infrared sensor)
http://www.trossenrobotics.com/store/p/5922-Parallax-PIR-Motion-Sensor.aspx


Accelerometer
http://www.amazon.com/MMA7260-3-Axis-Accelerometer-Sensor-Arduino/dp/B00538J88O


FSR sensor
http://www.trossenrobotics.com/store/p/6445--5-Inch-Force-Sensing-Resistor-FSR-.aspx