ITP Videos by Jeff Feddersen on Vimeo.
Watching time for videos on this page: 28:29
Jeff and Tom explain how rotary encoders allow you to read rotational motion.
Texas Instruments’ Bluetooth LE sensorTags contain a number of useful sensors in a self-contained, compact package: accelerometer, gyrometer, magnetometer, temperature sensors, all in a Bluetooth LE-enabled package.