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The openCR board is a great single board package for XM servo control that combines several convienient features in a single board: IMU, power adaptation and servo control. The device is reliable and easy to use. The addition of a microphone aids in debugging. I would give it a 5 star review but the price and delicate usb connector are less than ideal. Overall though, this is a solid product for people looking to control a XM servo.
+ Great controller option for the new line of X-dynamixels (though the options are limited)
+ Convenient powering options (I like the on board T-connector)
+ A great integrated IMU (one of the better ones I have used)
+ Built in sound is suprisingly useful for debugging and boot sequence notifications
- Needing to hit buttons to put in programming mode is inconvenient and made worse by being hard to hit on the board.
- Clock timers are prone to memory crashes issues
- Upload time is very long for even simple sketches
- Very very expensive board