code: def set_blink_rate(self, b):
          
          if b > 3:
              b = 0  # turn off if not sure
          self.firmata.i2c_write(self.board_address,
                                 (self.HT16K33_BLINK_CMD | self.HT16K33_BLINK_DISPLAYON | (b << 1)))
docs: Set the user's desired blink rate (0 - 3)
          @param b: blink rate