9: Kidnapped and blindfolded

Randi Eckstein grilled Elecia White (@logicalelegance) on inertial sensors: when to use accelerometers vs. gyroscopes; gyroscopes vs. rate sensors; how to make an inertial measurement unit; the basics of quaternions and Kalman filters; what products need which sensors (and why). Other good resources:Sensor Wiki (excellent visualizations)Guide to using IMU  (step by step practical...