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you can use 1Sheeld as input or output from Arduino and make use of all of the sensors and peripherals already available on your Android smartphone instead of buying the actual shields
Continuous rotation
A practical choice for compact drivetrains: adds useful value when choosing parts for a build
No moving float: Less wear than many float-based sensors
Teensy 3.6 without Headers - SparkFun DEV-14057 rpa58104b backlightsHigh Speed Teensy 3. x Board for USB Host, Audio, and Large Embedded Projects The Teensy 3. 6 without headers is one of the most capable boards in the Teensy 3. x line. It gives you more speed, more memory, more buses, and more I O for bigger robotics, audio, USB host, and data heavy projects. With its 180 MHz ARM Cortex M4, larger RAM and Flash, USB host support, and native SD features, it is a strong fit when a compact board still needs serious