I2C Option
Pros
- Allows many interface options
- PIC w/I2C support
- Serial
- USB
- Allows easy addressing
- Wide varity of support chips available
Cons
- Don't know much about it, but I don't know alot about many things
- Bus length issues?
Thoughts
- Could use 28 segment LED driver/GPIO chip to handle 12 port switching module with 12 lines for driving relays and 12 lines for sensing toggle buttons for manual overriding of relay state.
- Could build a simple module to control AZ/EL rotors using I2C 10 or 12 bit A-D converters. Relays could be driven by six bit GPIO chips.
Info
- Philips Semicondicutors I²C Handbook
http://www.semiconductors.philips.com/acrobat/various/philips_i2c_handbook.pdf - I²C-bus allocation table
http://www.semiconductors.philips.com/acrobat/various/IC12_97_I2C_ALLOCATION.pdf
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