The Prop Shield is meant for making interactive light and sound effects on small handheld props and wearable costumes.
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This shield features 10DOF motion sensors, 2 watt audio amp, high speed 5V buffers for driving APA102 LEDs, and an 8 Mbyte flash memory for images, sound clips, or data logging. It's approximately the size of a Teensy, just slightly longer to allow space for mounting holes and connections for power, speaker, and LEDs.
The motion sensors are accessed with the NXPMotionSense library.