def analog_write(pin, value)
      @pins[pin].value = value
      write(ANALOG_MESSAGE | pin, value & 0x7F, (value >> 7) & 0x7F)
    end
def analog_write(pin, value)
      @pins[pin].value = value
      write(ANALOG_MESSAGE | pin, value & 0x7F, (value >> 7) & 0x7F)
    end
Public: Write an analog messege.

 pin   - The Integer pin to write to.
 value - The Integer value to write to the pin between 0-255.

 Returns nothing.