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The SD21 is a 21 channel servo controller module. It will drive up to 21 RC servo's and maintain a 20mS refresh rate, regardless of the number of servos used or their positions (pulse widths). It will control both position and speed of the servos.
Full SD21 Documentation
Examples
I2C bus tutor - general I2C guide
Arduino - using an I2C interface
ATMEGA32 - Simple communication example
PIC18F4410 - driving servos example
PIC24FJ16GA002 - reading the result and displaying on a LCD03/LCD05
Picaxe18x - I2C communication example
Raspberry Pi - I2C communication to move a servo
