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Re: RobotOpen Control Shield for Arduino
Yup, it's another atmega328. It's actually providing the signals for the PWM channels since the Arduino alone doesn't have enough I/O. It also enables/disables all outputs...sort of like a coprocessor. The Arduino sends all of the PWM positions over serial in addition to a checksum to ensure the integrity of the data.
We'll be publishing the spec for how this all works shortly. Believe it or not the atmega is actually cheaper than a PWM IC!
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