Friday, 8 April 2011

Servo board schematics

So far, we've decided to build a board that supports 20 servo channels.
As you can see from the schematic, there are still a few spare digital pins.
We have deliberately kept a few PORTA pins free, for the eeprom/memory chip which we'll use to store and play back user-programmed sequences. If the board is for use on a portable device with serial communications, these pins could be recovered and used for analogue inputs, if required. Amending the firmware to use up some of the spare pins would allow up to 25 servo channels, but we decided to keep a few back for now, to see what the board can be used for and to make future development simpler!

In the full and final version, we'll put the eeprom onto pins PORTA.1-PORTA.5