Returns list of currently pressed buttons.

        Note that the sensor can only identify up to two buttons pressed at once.

def buttons_pressed(self, channel=1):
        """
        Returns list of currently pressed buttons.

        Note that the sensor can only identify up to two buttons pressed at once.
        """
        self._ensure_mode(self.MODE_IR_REMOTE)
        channel = self._normalize_channel(channel)
        return self._BUTTON_VALUES.get(self.value(channel), [])