Drives up to 21 RC servo's and maintains a 20mS refresh rate
I2C interface but also allows mounting of 18 or 24 pin microcontrollers for direct control
The Devantech SD21 Servo Controller will drive up to 21 RC servo's and maintain a 20mS refresh rate, regardless of the number of servo's used or their positions (pulse widths). It will control both position and speed of the servo's. It's controlled by sending commands to the on-board PIC18F2220 over the I2C bus. There are 3 I2C connectors on the board, any one of which can be used to connect to your controller. Alternatively, many controllers such as the BX-24, Picaxe, Atom, etc. can be fitted directly to the module, making this a great animatronics controller.
Amazingly powerful for such an unbelievably low price, The PICAXE-18X will fit on the SD21 module.
The SD21 is provided without the PICAXE-18X.